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Pentax Lens Review Database » Film Era Pentax K-Mount Lenses » FA Prime Lenses
SMC Pentax-FA 31mm F1.8 AL Limited Review RSS Feed

SMC Pentax-FA 31mm F1.8 AL Limited

Sharpness 
 9.5
Aberrations 
 8.5
Bokeh 
 9.6
Autofocus 
 8.8
Handling 
 9.5
Value 
 8.4
Reviews Views Date of last review
97 419,331 Tue November 21, 2023
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Recommended By Average Price Average User Rating
95% of reviewers $851.89 9.48
SMC Pentax-FA 31mm F1.8 AL Limited

SMC Pentax-FA 31mm F1.8 AL Limited
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SMC Pentax-FA 31mm F1.8 AL Limited
supersize
SMC Pentax-FA 31mm F1.8 AL Limited
supersize

Description:
This Limited lens features all-metal barrel and a built-in hood. It is known for delivering exceptional wide-angle image quality.



SMC Pentax-FA 31mm F1.8 AL Limited
© www.pentaxforums.com, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (A setting)
Diaphragm
Automatic, 9 blades
Optics
9 elements, 7 groups
Mount Variant
KAF
Check camera compatibility
Max. Aperture
F1.8
Min. Aperture
F22
Focusing
AF (screwdrive)
Quick-shift
No
Min. Focus
30 cm
Max. Magnification
0.16x
Filter Size
58 mm
Internal Focus
No
Field of View (Diag. / Horiz.)

APS-C: 50 ° / 42 °
Full frame: 70 ° / 60 °
Hood
Built-in
Case
Dedicated pouch
Lens Cap
Dedicated metal push-on
Coating
Ghostless,SMC
Weather Sealing
No
Other Features
Diam x Length
65 x 68.5 mm (2.6 x 2.7 in.)
Weight
345 g (12.2 oz.)
Production Years
2001 to 2021
Pricing
$1096 USD current price
$880 USD at launch
Engraved Name
smc PENTAX-FA 1:1.8 31mm AL Limited
Product Code
20280 (silver), 20290 (black)
Reviews
User reviews
In-depth review
Notes
One aspherical element, one ED element, one high refraction low dispertion element.
Variants

Black and silver


Features:
Screwdrive AutofocusBuilt-in HoodAperture RingAutomatic ApertureFull-Frame SupportDiscontinued
Purchase: Buy the SMC Pentax-FA 31mm F1.8 AL Limited
In-Depth Review: Read our SMC Pentax-FA 31mm F1.8 AL Limited in-depth review!
Sample Photos: View Sample Photos
Price History:



Add Review of SMC Pentax-FA 31mm F1.8 AL Limited Buy the SMC Pentax-FA 31mm F1.8 AL Limited
Author:
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Ascending) Showing Reviews 1-15 of 97
Pentaxian

Registered: August, 2009
Location: Wandering the Streets
Posts: 1,411
Review Date: November 21, 2023 Recommended | Price: $800.00 | Rating: 9 

 
Pros: If you need the picture this is the lens to use.
Cons: I have not personally found any downsides to this lens.
Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 8    Handling: 9    Value: 9    New or Used: New    Camera Used: PZ1p, MZ-S, K5iiS and *ist DS   

Is this the greatest lens ever? I really couldn't say and I am not sure I care. I enjoy my photography far too much to worry about those things. But if I need a lens on my film or digital Pentax cameras that always provides top notch performance and brings home excellent results then this is one of the few lenses I reach for. There are other lenses in this focal range that I think are just as good, maybe even better, but not for Pentax. The Zeiss Biogon 35mm f2 is an example that quickly springs to mind, but it isn't the only one. But that is pretty good company in my book.

Bear in mind, I rarely pixel peep nor do I usually try to shoot any of my lenses out on the bleeding edge. Unless I have to I am not a "wide open" photographer. I love my photographs to have eye-catching tones and colors. So I like to use them where they perform the best. This Limited lens does quite well at wide open apertures, and I have had to use it there before, but it can be truly stunning at f4 and f5.6. So that is where I use it most of the time. This is a Made in Japan copy that I have owned for a very long time. I bought it for my MZ-S and I have never regretted it. This truly is a classic and belongs in any Pentaxian's bag whether they shoot a crop sensor or a full-frame digital or film camera.

In my opinion this lens compliments the colors that the little 6 and 10 megapixel sensors provide.
   
Pentaxian

Registered: February, 2010
Location: Northern Michigan
Posts: 6,175
Review Date: April 15, 2023 Recommended | Price: $600.00 | Rating: 10 

 
Pros: Superb ambience, color, and rendering of detail
Cons: No longer technically on par with the very "best" lenses
Sharpness: 9    Aberrations: 8    Bokeh: 9    Autofocus: 8    Handling: 9    Value: 8    New or Used: Used    Camera Used: Pentax K-1   

Although the FA limited lenses were designed without numerical scores in mind, this doesn't mean they weren't technically superb lenses when they were first released over twenty years ago. They have been surpassed since on when it comes to such things as CA control and wide open sharpness by some of these high-end (and rather large and cumbersome) super primes. But in terms of aesthetics, of the image as it seen in a large print by the naked eye, nothing quite matches the FA 31 outside of high-end German glass. At its very best, the FA 31 produces images that had a beauty of tone, of tonal graduation, of rendering of detail that you'll find only in a handful of Japanese lenses. And while technically it may fall short of the very "best" lenses, it still holds up remarkably well even in terms of numerical specs. Yes, there is a bit of CA (which invariably cleans up in LR) and it's not as sharp wide-open as the latest and greatest. But those latest and greatest don't render detail like the FA 31; they lack the subtlety of coloration, the rich at times almost glossy ambiance, and the sheer subtle beauty of how this lens can project a scene. Those who are uptight about the FA 31's minor technical flaws would do well to avoid this lens. Get one of the DFA f1.4 primes instead. But for the aesthetically inclined photographer, this lens is self-recommending.

Some images, all shot with the K-1:

At f1.8:



At f5.6:



At f7.1:



At f11:

   
Forum Member

Registered: March, 2013
Posts: 70
Review Date: March 6, 2023 Not Recommended | Price: $600.00 | Rating: 6 

 
Pros:
Cons:
Sharpness: 8    Aberrations: 7    Bokeh: 8    Autofocus: 6    Handling: 10    Value: 4    New or Used: Used    Camera Used: K1ii, MZ-S   

I think a lot of the super positive reputation of this lens comes from either the film era, or use on the APS-C cameras that crop the sharpest center of the image or due to the Pentaxian echo chamber.


If you use this on a film camera like I did on my MZ-S, well, its hard to beat. Is there a film era 35mm f/1.8 from Canikon that performs as well AND is as elegantly sleek and good looking? I think not. If you shoot 35mm film and you want a 35mm-ish lens, I think this is a pretty awesome option. I now shoot 120 film, but if I ever went back to 35mm, the Pentax 31mm f/1.8 would be my top choice.


However, if you plan to use it on a digital full frame camera like I did on the K1II... well... it turns out pixies don't exist and there is no magical dust. Put a modern 35mm f/1.8 on a mirrorless camera (I have a Sony) and it will be better at basically everything, it will be smaller and to rub salt in that wound, it will also be cheaper.
   
Site Supporter

Registered: December, 2020
Location: Seattle, Minneapolis, Chicago
Posts: 40
Review Date: December 9, 2022 Recommended | Price: $500.00 | Rating: 10 

 
Pros: Sharpness, size, weight, appearance, Bokeh, color, contrast, etc
Cons: Really the only issue with this lens is the CA.
Sharpness: 10    Aberrations: 7    Bokeh: 10    Autofocus: 6    Handling: 10    Value: 8    New or Used: Used    Camera Used: K-1   

I coveted this lens for many many years before Pentax released a digital FF camera. I finally purchased the K-1 brand new after having gone through several flagship APC-C models once they were affordable used. This lens has been, and will continue to be my go to for general photography that I really want the best out of. This is my go to for most of my paid work, and never disappoints!


Check out my album for this lens on Flickr. I really need to categorize more of my photos from this lens, but cars are sort of boring, and that's mostly what I shoot with this lens.
https://www.flickr.com/photos/lordawesome/albums/72157716106511843
   
New Member

Registered: June, 2015
Posts: 9
Review Date: November 20, 2020 Recommended | Rating: 9 

 
Pros:
Cons:
Sharpness: 10    Aberrations: 9    Bokeh: 8    Autofocus: 10    Handling: 9    Value: 10    New or Used: Used    Camera Used: k1 mkII   

purchased used by a friend. I find the lens really interesting for full frame and with an ideal shooting angle. excellent definition. the price even if used is not low but well built and looks solid.



https://www.flickr.com/photos/geronimovercillo/50620917608/in/album-72157704292402054/


https://www.flickr.com/photos/geronimovercillo/50622057367/in/album-72157704292402054/

https://www.flickr.com/photos/geronimovercillo/50666299837/in/album-72157717013873466/

https://www.flickr.com/photos/geronimovercillo/50666299747/in/album-72157717013873466/
   
New Member

Registered: November, 2018
Location: Tokyo
Posts: 10
Review Date: June 13, 2020 Recommended | Price: $510.00 | Rating: 9 

 
Pros: f1.8, color rendering
Cons: heavy for a APSC, purple fringin, AF
Sharpness: 10    Aberrations: 8    Bokeh: 10    Autofocus: 8    Handling: 9    Value: 8    New or Used: Used    Camera Used: KP   

If you only care about image quality then this is the go to lens. But for the price I think I expect more. The AF and purple fringing shows its age.
   
Veteran Member

Registered: September, 2017
Location: Medellín
Posts: 1,322
Review Date: January 10, 2020 Recommended | Price: $550.00 | Rating: 10 

 
Pros: Wide and nine-bladed aperture, rendering.
Cons:
Sharpness: 9    Aberrations: 8    Bokeh: 10    Autofocus: 9    Handling: 10    Value: 10    New or Used: New    Camera Used: K-5, Film bodies   

Got it through the forum as a normal for my K-5 and stays on most of the time. Really amazing optic. Size comes with the large aperture. It just makes me want to get the other two!
   
Junior Member

Registered: May, 2013
Location: Makati City
Posts: 44
Review Date: May 1, 2017 Recommended | Price: $680.00 | Rating: 9 

 
Pros: sharpness, build
Cons: price
Sharpness: 10    Aberrations: 10    Bokeh: 10    Autofocus: 10    Handling: 10    Value: 8    New or Used: Used    Camera Used: Pentax K-S2   

Mine is a used Pentax FA 31 1.8: black edition, assembled in Vietnam. This copy may have been manufactured around 2012 or so, since Ricoh does not yet appear on the box although the paperwork already mentions the acquisition by Ricoh (which I understand happened in late 2011).

Autofocus is accurate with the K-S2, even when shooting at max aperture.

I’m pleased with the images taken with the Pentax K-S2. Properly focused (with the exception discussed below), images are acceptably sharp from corner to corner even at f/1.8. Compared to my A 28 2.0, K50 1.2, and DA 50 1.8, the FA 31 has noticeably better sharpness/contrast at large apertures. I would rate the FA 31 in the same league as the Zeiss 2/35 in sharpness.

Now the exception. With the focus at infinity, closer in-focus subjects are significantly sharper than subjects farther away below f/8. Focused at infinity, closer subjects, such as objects across the street, are acceptably sharp from corner to corner even at f/1.8, while subjects farther away — even those near the center of the frame — are blurry. More distant subjects sharpen up at f/8.

Example below shows what I mean.

The test scene shows objects across the street (electric posts), and farther away a construction site.




These are 100% crops, unsharpened, no adjustments.


So it’s f/8 for landscapes, any other aperture for closer subjects. My Zeiss 2/35 behaves like the FA 31 for distant subjects, so that does not seem like a peculiar behavior.

Below is a handheld shot using the FA 31 at f/8, no sharpening.



This is a 100% crop of the rocks.
   
New Member

Registered: January, 2013
Posts: 2
Review Date: December 8, 2014 Recommended | Price: $773.42 | Rating: 10 

 
Pros: Wow - amazing
Cons: None
Sharpness: 10    Aberrations: 10    Bokeh: 10    Autofocus: 10    Handling: 10    Value: 10    New or Used: New    Camera Used: K-7   

I am a novice, so I cannot add much more value than the other experts in this forum. Yay, for Black Friday sales!
   
New Member

Registered: September, 2014
Posts: 1
Review Date: October 1, 2014 Recommended | Price: $900.00 | Rating: 10 

 
Pros: sharpness, bokeh, colour rendition, bouild quality
Cons: some CA
Sharpness: 10    Aberrations: 8    Bokeh: 10    Autofocus: 9    Handling: 10    Value: 6    New or Used: New    Camera Used: K10D   

Stunning lens, fantastic 3d rendition, great bokeh, razor sharp. Build quality is fantastic.
   
Site Supporter

Registered: November, 2010
Location: New Berlin, WI
Posts: 528
Review Date: August 8, 2014 Recommended | Price: $1,000.00 | Rating: 10 

 
Pros: Amazing IQ (sharpeness, colors, contrast, bokeh), Metal construction
Cons: Some noticeable CA, Price
Sharpness: 10    Aberrations: 7    Bokeh: 10    Autofocus: 9    Handling: 10    Value: 9    New or Used: New    Camera Used: K-3, K-5   

Just an exceptional lens. Amazing image quality, including razor sharpness and very smooth bokeh (very smooth). A bit of CA on digital sensor, but this lens was designed for film so... That's the only point that doesn't make it perfect. Built quality is superb.
For photographers who only want the best.
   
Veteran Member

Registered: February, 2011
Posts: 4,873
Review Date: August 4, 2014 Recommended | Price: $900.00 | Rating: 10 

 
Pros: Bokeh, Rendering
Cons: No quick shift, no WR
Sharpness: 9    Aberrations: 6    Bokeh: 10    Autofocus: 8    Handling: 8    Value: 8    New or Used: New    Camera Used: Pentax K-5   

It's tough to reasonably imagine a much better lens.

Bokeh is the best I've ever seen for a wide-angle. Pretty sharp.

Aberrations are only OK, but controllable.
   
New Member

Registered: November, 2013
Posts: 3
Review Date: January 25, 2014 Recommended | Price: $954.00 | Rating: 9 

 
Pros: My copy is very sharp even wide open.
Cons: A bit expensive...
Sharpness: 10    Aberrations: 7    Bokeh: 10    Autofocus: 8    Handling: 8    Value: 7    New or Used: Used    Camera Used: K-3   

I've always wanted an FA Limited but am unable to afford one until now. I find the most useful for me to be the 31mm focal length. It's really amazing, i've never had a lens like that even if mine is a used copy... i would only go for a Made In Japan copy over an Assembled In Vietnam copy... I found one that is almost perfect.
   
Senior Member

Registered: October, 2011
Location: Cambridge, Ontario
Posts: 179
Review Date: December 15, 2012 Recommended | Price: $600.00 | Rating: 10 

 
Pros: Sharpness, amazing IQ
Cons:
Sharpness: 10    Aberrations: 9    Bokeh: 9    Autofocus: 9    Handling: 10    Value: 9    New or Used: Used    Camera Used: K5   

I have wanted this lens for a long time. Two months ago I found a used one at the Henry's show (lucky for me it was hidden under some Nikon boxes) and saw the price and picked it up immediately.

It is a fixture on my K5 along with my DA Limiteds. The IQ is stunning and the lens lives up to its reputation. My only regret is I waited this long.
   
Veteran Member

Registered: December, 2009
Location: USA - Delaware
Posts: 435
Review Date: October 21, 2012 Recommended | Price: $1,100.00 | Rating: 10 

 
Pros: Soft at 1.8 (perfect portraits), Sharp past 2.8, Bokeh rendition, color, contrast
Cons: Soft at 1.8 (for handheld at night), price
Sharpness: 9    Aberrations: 8    Bokeh: 10    Autofocus: 9    Handling: 10    Value: 9    New or Used: New    Camera Used: K-7   

Amazing. Absolutely amazing. It renders like no other. Contrast and color are fantastic right out of the raw file.

Portraits: great wide open. Even thought it is a little soft, it creates glowing portraits with wonderful 3D bokeh. The pixie dust is there!



Landscape: Sharp past F2.8. Great for night photography also as it creates beautiful starbursts after F10.




I was skeptical about its value. It is EXPENSIVE! When I got it I expected it to be super sharp! It is not... Wide open it is soft(ish) but slightly stopped it is amazingly sharp. Like I said, the softness I find an advantage for portraits. I do think the price is entirely justified. Just buy it! You will not regret it!
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