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HD Pentax-DA 20-40mm F2.8-4 Limited DC WR Review RSS Feed

HD Pentax-DA 20-40mm F2.8-4 Limited DC WR

Reviews Views Date of last review
64 270,999 Sun July 16, 2023
Recommended By Average Price Average User Rating
92% of reviewers $696.06 9.14
HD Pentax-DA 20-40mm F2.8-4 Limited DC WR

HD Pentax-DA 20-40mm F2.8-4 Limited DC WR
HD Pentax-DA 20-40mm F2.8-4 Limited DC WR
HD Pentax-DA 20-40mm F2.8-4 Limited DC WR
HD Pentax-DA 20-40mm F2.8-4 Limited DC WR
HD Pentax-DA 20-40mm F2.8-4 Limited DC WR

The HD Pentax-DA 20-40mm F2.8-4 Limited DC WR is the first zoom lens to join the Pentax lineup of ultra-compact "limited" lenses. This lens features a sleek all-metal barrel manufactured to very high standards.

This is also the first Limited series lens to feature silent DC autofocus as well as a weather-sealed design. Like the other HD Limited lenses, this lens features Pentax's latest lens coating promising less ghosting and flare.

As is standard for all premium Pentax lenses, this lens allows for full-time manual focus adjustments (Quick shift) and it is treated with Pentax's Super Protect coating to protect the front element from dust and scratches

The lens covers a wide-angle to normal focal length range, and is compatible with Pentax APS-C DSLRs. It will be available in both black and silver in December, 2013 for $999.

HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
©, sharable with attribution
Image Format
Lens Mount
Pentax K
Aperture Ring
Automatic, 9 blades (rounded)
9 elements, 8 groups
Mount Variant
Check camera compatibility
Max. Aperture
Min. Aperture
AF (in-lens motor)
Min. Focus
28 cm
Max. Magnification
Filter Size
55 mm
Internal Focus
Field of View (Diag. / Horiz.)

APS-C: 39-70 ° / 33-62 °
MH-RA 55mm
Soft pouch P70-150
Lens Cap
Metal push-on O-LW65A
Weather Sealing
Yes (WR)
Other Features
Diam x Length
71 x 68.5 mm (2.8 x 2.7 in.)
283 g (10 oz.)
Production Years
2013 to present (in production)
$450 USD current price
Engraved Name
HD PENTAX-DA 1:2.8-4 20-40mm ED Limited DC WR
Product Code
23000 (black), 23010 (silver)
User reviews
In-depth review
Unofficial Full-Frame Compatibility Tests by Pentax Forums
★★☆ Full coverage at some F-stop and focal length combinations
Show details
One aspherical element, one ED and one extra-low dispersion element.
No autofocus on older bodies (*istD series, K100D, K110D, and film).

Black and silver

Supersonic AutofocusQuick ShiftWeather SealedAutomatic ApertureAPS-C Digital Only
Purchase: Buy the HD Pentax-DA 20-40mm F2.8-4 Limited DC WR
In-Depth Review: Read our HD Pentax-DA 20-40mm F2.8-4 Limited DC WR in-depth review!
Sample Photos: View Sample Photos
Price History:

Add Review of HD Pentax-DA 20-40mm F2.8-4 Limited DC WR Buy the HD Pentax-DA 20-40mm F2.8-4 Limited DC WR
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-15 of 64

Registered: January, 2012
Location: Tokyo
Posts: 2,678

2 users found this helpful
Review Date: July 16, 2023 Recommended | Price: $500.00 | Rating: 9 

Pros: Rendering, bokeh, design, size, cost performance, WR
Cons: Aberrations wide open, focusing not the fastest
Sharpness: 8    Aberrations: 6    Bokeh: 9    Autofocus: 7    Handling: 10    Value: 9    New or Used: New    Camera Used: K-5 IIs, K-01, K-3 III   

At first I didn't see the point of a zoom lens with so little range, but after a while I started to think of it differently. Pentax doesn't make a prime around 24mm and I started to think of this as a 30mm, with room for adjustment. So I went ahead and bought it from Ricoh's own outlet store. I'm really glad I did, because this has become by far my most used lens.

I like using primes for their size and image quality, and have quite a few of the SMC Limited series. Even so, the lens changes become frustrating when traveling. This lens provides prime-like quality, along with some of the convenience of a zoom in a very light package. Recently my favored travel kit is this lens for 70-80% of shots, the 15mm Limited for the wide end and the 77mm for telephoto.

The size of this lens is just right on an APS-C camera. The detailing on the metal barrel feels really nice and sets it apart from the rubber feeling of other lenses. The hood doesn't seem to provide much protection, but it has the advantage that the lens is ready to shoot as soon as you pull the cap off - very quick to start shooting.

This lens produces really nice image quality. The colour is good and the bokeh is pleasant, even though a lens with these specs is never going to be the choice for extreme subject isolation. This lens duplicates the range of my DA 21 Limited FA 35mm and DA 40 Limited. It seems to be up to the level of the 21mm, but I do feel the 35mm and 40mm lenses give greater sharpness at their respective focal lengths.

The weakness of this lens is fringing at wide aperture with strong contrasts. It is especially noticeable in nighttime city scenes. I'm not sure how obvious it will be at this resolution, but in this image below (30mm, f4 with a K-5 IIs), there is quite a lot of color fringing around the street lamps and office windows.

Overall, this lens is highly recommended, and importantly can be used to fill a gap in Pentax's prime line-up. Here are some more images taken with this lens and a K-3 III.

New Member

Registered: January, 2023
Posts: 1

2 users found this helpful
Review Date: January 28, 2023 Recommended | Rating: 9 

Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 8    Handling: 10    Value: 10    New or Used: New    Camera Used: KP K10D   

Very good lens for me, its small and very good contrast, sharpness is very good. Lens is product off metall and glass no plastic it is amaizing for this these days. And it is very small !

IMGP3623 by Łukasz Karzełek, on Flickr
Site Supporter

Registered: October, 2015
Location: Toronto
Posts: 24
Review Date: January 1, 2023 Not Recommended | Price: $400.00 | Rating: 5 

Pros: Sharpness
Cons: Build quality
Sharpness: 9    Aberrations: 8    Bokeh: 8    Autofocus: 7    Handling: 7    Value: 5    New or Used: New    Camera Used: K3 III   

Purchased lens directly from Ricoh as a reconditioned lens. I would not do that again as a year and a half later I have to see how much the sticking barrels is going to cost to fix.
This lens has been babied since I received it and it is now broken. Other than the poorly designed lens cap, this lens has performed well.
Veteran Member

Registered: June, 2012
Posts: 506

2 users found this helpful
Review Date: October 23, 2022 Recommended | Rating: N/A 

New or Used: New   

Hard to consider this a "good" lens when the reviewer lists the following opinions:

Poor corner sharpness, especially at 40mm
Low contrast wide-open at 40mm
Sub-par center sharpness at 40mm
Moderate vignetting if left uncorrected
Small hood makes it prone to flare
No filter threads on hood, unusual 55mm diameter
Expensive ($999)

Read more at:
New Member

Registered: July, 2016
Posts: 16

1 user found this helpful
Review Date: July 2, 2022 Recommended | Price: $496.00 | Rating: 10 

Pros: Image Quality, Quiet, Light Weight, Build Quality, Rendering, Weather Sealing
Cons: None from my use.
Sharpness: 9    Aberrations: 9    Bokeh: 10    Autofocus: 9    Handling: 10    Value: 9    New or Used: New    Camera Used: Pentax K3   

This is my first Limited Lens for my K3. The build quality is top tier. You can feel the quality of the lens straight out of the box. My experience using the lens has been nothing but pleasurable. It focuses smoothly and quietly. The manual focus is dampened and has a quality feel to it. The image quality I've experienced is everything I hoped for. Color and contrast is like that of my Mamiya medium format film camera lenses. What "negatives" others may have had with this lens I was well aware of before I purchased mine. The lens is exceptional and has a handmade feel to it. I will purchase additional Limited Lenses in the near future.


Registered: April, 2009
Location: Madrid, Spain
Posts: 10,202

3 users found this helpful
Review Date: May 3, 2022 Recommended | Price: $240.00 | Rating: 8 

Pros: Quite small, nice build quality, useful focal range, great image quality
Cons: Slow focus, focus accuracy, max aperture not super fast
Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 9    Handling: 10    Value: 8    New or Used: Used    Camera Used: K-3   

This lens is taking more time than usual for me to really reach a conclusion and that's because it's a bit of an oddball with many things being neither here nor there - the focal range is short but useful, the maximum aperture is OK but not great, the focus is quiet but slow and not always accurate (at least my copy).

I have wanted this lens since it first came out as I have all the DA Limited primes and I love using them. A WR zoom that covers the most useful focal range with a decently fast max aperture and the feel and IQ of a Limited lens sounds great and I bought a used copy even though I already own the 16-85mm as a high quality WR option.

Image quality

Image quality is very good indeed. The lens is sharp wide open at all focal lengths, colour and contrast are typical DA Limited, flare is minimal and I haven't noticed any distortion. Though this lens isn't fast enough to be a real bokeh monster, the out-of-focus rendering is nice, especially wide open at 40mm.

Focal length

This is a short zoom that doesn't go as wide or long as even a kit lens and yet it covers focal lengths that are good for probably 90% of what I want to do. In practice I've found in the past that the DA 21mm is wide enough for most things so 20mm should be fine, and it is, but you'll probably want to have a wider option for when it's needed.


f/2.8-4 is not particularly fast, especially at the long end and I can't help but feel that for the price and size it should really be a constant f/2.8 or even f/2.8-3.5. At 40mm and f/4 it's still possible to isolate close subjects and the other image quality factors still allow a nice 3D feel despite the modest aperture.

Size, build and handling

The build quality is typical of the DA Limiteds in that everything feels nice but it's also lightweight. The zoom ring is lovely and smooth. In fact it feels light enough to give the impression that a large proportion of it is empty space and the lens could probably be made more compact. The lens is pleasurable to use, more so than probably any other zoom I've tried, which is what I'd hoped for in a Limited.


The focusing motor is nice and quiet but a little slow. With no fine-tuning my copy focuses perfectly at 20mm but is a bit off at 40mm and with this being a zoom, fine-tuning becomes a question of finding a setting that satisfies at both ends of the range, which is not easy. So far a change to -7 improves the results at 40mm while apparently leaving the 20mm untouched, which seems strange. I still need to play a little more with this though as it's not perfect at 40mm. Other people report that their copies are fine with no fine-tuning needed.


In summary, this is an excellent lens for walk-about use but many of it's limitations mean that there's almost always something better in terms of range or speed and at least equal in image quality. So what sets this lens apart? Why should you buy it? Well, I suppose it brings together a number of factors that you won't find elsewhere all together in a package that's this small and light. There's nothing that offers this image quality, range, speed, Limited build and pleasure of use all together in one package. However, as soon as you're willing to compromise on any one factor (size, weight, speed, IQ etc) there is immediately something that's better. That means that this lens is the best for what it is, but that niche is very narrow. In my case I'll keep it because there's no zoom this size and weight that I can enjoy using, and get such good results from, as much as a DA Limited. That makes it a great walk-around lens where there's no pressure to need anything wider, longer or faster, but if I do need to go outside of this lens's limitations then I'd take something else instead.

In the end I sold my copy but I could be tempted to get another in the future if I can find one that focuses properly at both ends of the focal range.

Baby feet
by Jonathan MacDonald, on Flickr

by Jonathan MacDonald, on Flickr

by Jonathan MacDonald, on Flickr

Lost in the sand
by Jonathan MacDonald, on Flickr

by Jonathan MacDonald, on Flickr

Posts and rope
by Jonathan MacDonald, on Flickr

by Jonathan MacDonald, on Flickr

by Jonathan MacDonald, on Flickr
New Member

Registered: January, 2022
Posts: 2

4 users found this helpful
Review Date: January 18, 2022 Recommended | Rating: 10 

Pros: Sharpness across the frame, fixed lens hood, exelent image quality
Sharpness: 10    Aberrations: 10    Bokeh: 10    Autofocus: 8    Handling: 10    Value: 10    New or Used: New    Camera Used: K3 iii   

Direkt comparission with Da 16-85, HD 21 limited and HD 40 limited, the 20-40 winns in sharpness and overal rendering.

The 20-40 is extrem resistand against flare!
It outperforms my 21 limited and 40 limited.

Canīt understand the in- depth copy is sharp from corner to corner 20mm and 40mm.

At f5.6 everything is better than my 21mm and 40mm limited

Bokeh is great.

all in all same league as my 50-135
Site Supporter

Registered: June, 2017
Location: 3City agglomeration
Posts: 1,829

3 users found this helpful
Review Date: November 18, 2021 Recommended | Price: $973.00 | Rating: 10 

Pros: Feel, build quality, image quality
Cons: lens cap, short focus throw
Sharpness: 10    Aberrations: 10    Bokeh: 8    Autofocus: 8    Handling: 10    Value: 10    New or Used: New    Camera Used: Pentax K-3 Mk III   

When I am using this lens I really feel as if I have pack of primes with me. I rarely use it like a zoom, just set up the focal length I feel at the moment and zoom with my feet. I think Pentax nailed this lens as Limited and being a zoom does not make it any less Limited then other Ltds. From all lenses I used till this time this one feels closest to old style manual lenses - both in look as in feel when operating.

Image quality is superb. I am not a pixel peeper so I will not say anything about aberrations and such - never noticed it on print or on screen. Frankly I don't care even if it sound not really photographic. There is no problem with using this lens in full sun or with artificial lightning shining from any side. Lens just delivers. It may be a walkaround lens for those not requiring long zoom range but still wanting something more elastic then prime. But it also works as "serious" lens for photographic projects etc. It is nicely paired with 15mm Ltd and I think with 70mm would make a perfect triplet.

Build quality leave almost nothing to be desired. It feels solid and sturdy, all lettering are clear, rings are easy to operate, but leave nice tactile feedback.

Cons? Two: for manual focus the focus ring throw is a bit too short. I would prefer something longer, but well, it is modern lens build with AF in mind. Second issue I have with it is lens cap. It is push on with material inside and after few months of use it already feels not as tight fitting as on beginning.

All in all - great lens, no regrets in getting it.

Here are some image samples:

Senior Member

Registered: June, 2021
Posts: 124

2 users found this helpful
Review Date: October 2, 2021 Recommended | Price: $497.00 | Rating: 10 

Pros: Sharpness, Build, Motor is silent, Weather resistance
Cons: not fast enough after 22mm
Sharpness: 10    Aberrations: 10    Bokeh: 9    Autofocus: 9    Handling: 10    Value: 9    New or Used: New    Camera Used: KP   

A perfect walkaround lens on KP. The sharpness is impressive, even better than DA21 on the wide end. An all-in-one alternative to DA21 DA35 DA40 plus weather resistance and silent DC motor.
New Member

Registered: May, 2016
Posts: 20

2 users found this helpful
Review Date: March 6, 2021 Recommended | Price: $350.00 | Rating: 9 

Pros: Full Frame coverage better than expected, Center sharpness equals best primes
Cons: None
Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 8    Handling: 9    Value: 9    New or Used: Used    Camera Used: K-1   

Just purchased this lens used, expecting to use it as an APS-C travel walk around and to replace primes on long hikes. The very first thing I did after unboxing was mount it on my K-1 to check full-frame coverage. Wow, was I ever surprised! Even at 20mm, there is a usable image (corners are black), and by 24mm, the corners are filled in with only mild vignetting! At 20mm, it's possible to crop a 2.5:1 panorama. The lens is very sharp, as sharp in the center as my FA 35mm f/2 AL, which is one of my sharpest lenses.

Given that the full frame coverage of this lens isn't often discussed, I thought I'd share a couple of sample photos (shot a few minutes after unboxing!). These are three exposure HDR images shot at f/8 (-2/0/+2) processed with Photomatix Pro - basically using the same process I would use for architectural photos (to assess how the lens would actually perform in my intended use). I think the full frame coverage is truly impressive, and is an important aspect for anyone who owns a K-1:

Full-frame image at 20mm - obviously vignetted, but also usable for cropped panorama

Full-frame image at 25mm, small amount of vignetting, correctable in post processing (Note that this amount of vignetting is less than many Sony 'Full Frame' lenses!):

Overall, I'm very impressed with the lens - basically flawless on APS-C, but maybe more importantly it also offers 'unadvertised' excellent performance on full frame.

Edit: It turns out that vignetting comes back at around 35mm when zooming, so the useful range on full frame with minimal vignetting is around 23mm-33mm. Still, once above 30mm, you're back to using the lens as intended, i.e. 20mm in APS-C crop mode. So on the K1, I will use as an APS-C crop 20-40mm lens (30-60mm effective), but switch to full frame to extend the usable wide angle range to between 23-30mm, and even down to 20mm for cropped panorama shots.
New Member

Registered: December, 2019
Posts: 7

5 users found this helpful
Review Date: December 1, 2020 Recommended | Price: $497.00 | Rating: 9 

Pros: Build Quality, Color Render, Compact, WR
Cons: Curve of Field, Little Bit Soft Corner
Sharpness: 8    Aberrations: 7    Bokeh: 8    Autofocus: 7    Handling: 10    Value: 9    New or Used: New    Camera Used: KP   

Zoom range is narrow but weight is light and compact,and you'd like to take it outside for travel!
Color rendering is so beautiful, contrasty, and satruate.
Good for Travel, Street Snapshot, and Living style photo.

The Build Quality is awesome, all metal barrel just like the takumar lenses.
Trust me, it's a artcraft when you compare with plastic lens.

But the curve of field made the corner so soft, it is weak point, but just pay more attention for focus! It's fine!

Anyway, DA 20-40/2.8-4 Limited is wonderful lens, and I use it as my stardard zoom lens!

Senior Member

Registered: November, 2012
Location: Copenhagen, Denmark
Posts: 102

6 users found this helpful
Review Date: November 29, 2020 Recommended | Rating: 10 

Autofocus: 10    Handling: 10    Value: 10    New or Used: New    Camera Used: K-3   

The reviews and the evaluation of this new HD Pentax Limited zoom lens have been very different - some very negative and some very positive. I think that PentaxForums' test and evaluation of the lens is unfair with regard to sharpness (sample variation?). As soon as I received the lens I made some test footage, and I was admittedly a little confused about the results, but after some time I noticed an issue with back focus. It was subsequently adjusted to Back Focus + 5. Since then the results have been excellent. Back Focus + 5 was applied on two camera bodies (both K-3) with the same excellent result. The lens is sharp throughout the entire zoom range from 20 mm to 40 mm. I haven't noticed any decrease in picture quality in the long end of the zoom range. The color rendition is warm and very appealing - it can be compared with the DA *16-50 mm 2.8. The external parts of the lens are made of metal. I can highly recommend the lens. The reviews that have been negative may have forgotten that the lens is only one parameter of several in the process: photographer + camera/sensor + lens + image processing software + the photographer's ability to get all the qualities above. Lens quality is obviously very important - ultimately decisive, but so too the photographer's ability or skills. Thank you Ricoh/Pentax for this wonderful lens. It has lifted the pleasure of photography up to a higher level!
New Member

Registered: October, 2020
Posts: 4

3 users found this helpful
Review Date: October 10, 2020 Recommended | Rating: 9 

Pros: A stack of primes
Cons: A constant aperture would have been nice...
Sharpness: 9    Aberrations: 9    Bokeh: 10    Autofocus: 9    Handling: 9    Value: 10    New or Used: Used   

Hi Awesome Peeps

I am no pro here but I felt compelled to give my insights on this wonderful lens from a hobbyist's point of view.

Come to think of it for the value one gets for this lens it's like having the DA 21mm 35mm and 40mm Limited rolled into one. It's a bit faster than the DA 21mm at that focal. Slower than the DA 35mm and 40mm. One gets WR though in one stack of primes. Center sharpness is outstanding for a zoom through out its entire focal range. Stopping down to 6.3 onwards gives very good corner to corner sharpness. The nice bokeh it gives is a wonderful bonus. I find the colors lack a bit of warmth though at times but overall I am one happy boy when I shoot this lens.

I could not afford getting one but was able to swap some of my lenses for this. From a hobbyist's point of view this is one highly recommendable lens.

I've posted some shots. These won't win any awards but I just wanted to show how this lens renders. Cheers!!!

Senior Member

Registered: July, 2020
Posts: 130

1 user found this helpful
Review Date: August 12, 2020 Recommended | Price: $528.00 | Rating: 8 

Pros: good build, appearance; light weight; compact size; optics
Cons: lens cap and thin hood; no aperture ring; manual focus only on my K10D without firmware update; not designed for FF cameras
Sharpness: 9    Aberrations: 8    Autofocus: 8    Handling: 7    Value: 7    New or Used: New    Camera Used: K10D, K-3 II   

Great little zoom lens, covering a good range for me. I wish they made this for FF cameras, to go with my forthcoming K-1 and my old LX cameras. It autofocuses well on my K-3 II camera, but I discovered after I bought the lens new that it won't autofocus with my K10D; this is only a minor problem to me because I like to manual focus. [I see on the "Notes" at the top of this review page that there is "No autofocus on older bodies (*istD series, K100D, K110D, and film)", and I presume this list includes the K10D, so I have only myself to blame for not researching enough. I just didn't consider the possibility that this lens would not autofocus with my K10D because my DA 12-24mm f/4 lens autofocuses well with it; my K10D works quite well, thank you. [After I posted this initially, three readers have pointed out that I need to update my K10D firmware through the Ricoh website, and then I should have autofocus ability with this lens -- good to know.]

The lens cap is maddening to use, as is the thin lens hood. The cap takes a good pull to take off, and I wonder what thousands of such pulls can possibly do to the lens zoom structural elements over time. Also, the lens cap only fits over the lens hood, so you have to have the lens hood on to have the lens cap on. There aren't many good lens caps out there, and I can imagine designers/engineers going crazy trying to develop what one would think would be a simple item to be practical and easy in use.

The lens hood has to be removed to put on a filter, and this is a huge problem because the hood is placed then on top of the filter threads, which means you turn the lens hood with the filter and can only turn it counterclockwise (as seen from the viewfinder) because turning it clockwise will loosen the hood and not give good turning motion on the filter. I also have difficulty with filters sitting too tight on the lens, making them very hard to remove. The screwing in of the lens hood onto my polarizing filter definitely has the effect of tightening the filter onto the lens, making it hard to pull off. I've played with this quite a bit and am convinced I'm doing nothing wrong. Just bad design for filters.

I haven't really looked at bokeh, so didn't rate it. The lens' optical sharpness seems very good, and the aberrations seem very slight for a zoom lens encompassing these focal lengths (I'm very impressed at 40mm, and at 20mm the distortion is minimal with not much vignetting). I don't see color problems. I used a resolution chart to test the lens (with K10D at ISO 100 in direct sunlight) for sharpness and distortion at 20, 30, and 40 mm, and at f/2.8, f/3.5, and f/4.0 wide open (respectively), up to f/22, and the sharpness and lack of distortion is excellent -- even at 20mm. The sharpness improves at f/8 over wide open, but the wide-open sharpness is good for most purposes. The narrow focal-length zoom ring does its job, turning about 60 degrees to the left (counter-clockwise, as seen from behind the camera) from 40 to 20 mm; good design, with no possibility of "zoom creep" when pointing up or down. The filter does not rotate when the lens is focused or zoomed. The thin manual focusing ring turns about 90 degrees from infinity (also counter-clockwise as viewed from behind the camera) to closest focus, and it's not as good as typical manual focusing rings on older (pre-F-series) Pentax lenses, but it's adequate.

For me, the lens is over-priced (my listed price above includes sales tax, as bought from B&H with free shipping). But in terms of the optical quality, it seems impressive indeed, and worthy of being in the Limited family. I will keep it and probably use it a lot on my K-3 II cameras (though in practice, it has not come close to replacing my DA 12-24mm lens as my standard walkaround lens on my APS-C cameras, as I thought it might when I ordered it).

Below are photos showing the lens on my camera:

New Member

Registered: November, 2018
Location: Tokyo
Posts: 10

1 user found this helpful
Review Date: June 13, 2020 Recommended | Price: $420.00 | Rating: 10 

Sharpness: 9    Aberrations: 9    Bokeh: 10    Autofocus: 10    Handling: 10    Value: 9    New or Used: Used    Camera Used: KP   

The lens you can attach to your camera all day and take quality images. Sometimes wants some wider f stop but for the size I cannot complain.
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