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SMC Pentax-M 28mm F3.5

Reviews Views Date of last review
48 198,006 Fri February 14, 2020
Recommended By Average Price Average User Rating
100% of reviewers $59.68 8.85
SMC Pentax-M 28mm F3.5

SMC Pentax-M 28mm F3.5
SMC Pentax-M 28mm F3.5

The slower of the two M variants, it succeeded the original K 28mm lens.

SMC Pentax-M 28mm F3.5
©, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (no A setting)
Automatic, 5 blades
6 elements, 6 groups
Mount Variant
Check camera compatibility
Max. Aperture
Min. Aperture
Min. Focus
30 cm
Max. Magnification
Filter Size
49 mm
Internal Focus
Field of View (Diag. / Horiz.)

APS-C: 55 ° / 46 °
Full frame: 75 ° / 65 °
PH-S49 (28/35mm)
Dedicated hard case
Lens Cap
Plastic clip-on
Weather Sealing
Other Features
Diam x Length
63 x 31.5 mm
180 g
Production Years
1977 to 1985
Engraved Name
smc PENTAX-M 1:3.5 28mm
Product Code
User reviews
Manual FocusAperture RingFull-Frame SupportDiscontinued
Price History:

Add Review of SMC Pentax-M 28mm F3.5
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-15 of 48
Junior Member

Registered: June, 2013
Posts: 30

1 user found this helpful
Lens Review Date: February 14, 2020 I can recommend this lens: Yes | Price: $50.00 | Rating: 9 

Pros: Sharpness, price
Cons: None
Sharpness: 9    Aberrations: 8    Bokeh: 8    Handling: 10    Value: 10    Camera Used: K-1ii   

For a $50 lens, this is a smooth operator. Recommended to me by my local camera store as shaper than the f2.8 version, I choose it over the 35mm-FAf2.8 version which had very plasticky aperture clicks.
Focus ring is impressively smooth, and the sharpness on first try outdoors in very diffuse light was above par.
Site Supporter

Registered: November, 2017
Posts: 476

1 user found this helpful
Lens Review Date: October 13, 2019 I can recommend this lens: Yes | Price: $15.00 | Rating: 9 

Pros: Color reproduction, weight, size
Cons: Not many...
Sharpness: 8    Aberrations: 9    Bokeh: 9    Handling: 9    Value: 10    Camera Used: K-3   

I decided to try this out with a 20mm Spiratone extension tube today, as well as taking some general shots. With extremely mild editing, both macro and non-macro photos turned out beautifully. I am especially impressed with the color reproduction of this lens, requiring very little adjustment (if at all) out of camera to equal what I observed with the naked eye. Highly recommend, especially since you can get it relatively inexpensively.
New Member

Registered: July, 2019
Posts: 8

1 user found this helpful
Lens Review Date: August 21, 2019 I can recommend this lens: Yes | Price: $61.00 | Rating: 10 

Pros: like all of the M series small size.
Cons: None really when factoring size & cost to performance
Sharpness: 7    Aberrations: 7    Bokeh: 7    Handling: 10    Value: 10    Camera Used: Nikon Z6 & Pentax Me Super   

You can't go wrong with this lens. Its stupidly cheap, small and gives you results far in excess of what you have a right to expect from such a price point. Is it up to today's super sharp behemoths? Of course not, but, if you want a super small lens that you can throw in your bag and have on hand in the off chance you need wide - this is it. The colour 'pop' is awesome. This is a seriously good lens. Its not sharp at all in the corners, but that is part of its allure I think, the general 'feel' of the photos made by this lens are very pleasing to my eye.

New Member

Registered: July, 2016
Location: Toronto
Posts: 3
Lens Review Date: March 22, 2019 I can recommend this lens: Yes | Price: $60.00 | Rating: 9 

Pros: build quality, handling, size, weight, sharp
Cons: none
Sharpness: 9    Aberrations: 8    Bokeh: 7    Handling: 10    Value: 10   

It's a awesome lens. very tiny and the image quality you can pull out from is amazing. I have used this tiny beauty on APS-C format and the equivalent field of view is 42.5 mm in 35mm format. It's sharper than its 2.8 sister and the overall image quality is superior compare to the 2.8 one. Keeping your eye on ebay you can find a mint condition for a little money. Highly recommended.
Senior Member

Registered: April, 2007
Location: Toronto/Victoria
Posts: 265
Lens Review Date: February 6, 2019 I can recommend this lens: Yes | Price: $30.00 | Rating: 9 

Pros: Compact and reasonably good IQ
Cons: Manual lens
Sharpness: 8    Aberrations: 9    Bokeh: 8    Handling: 8    Value: 9    Camera Used: K-1, K100D   

This is a very good normal lens on APS-C - it is as good or better than the A28/2.8 and A28/2.0 other than functionality and maximum aperture.

On the K-1, it is also better than those two lenses which suffer from softer corners and quite a bit of green/magenta CA. It's not as good as the K28/3.5, but it gets fairly close; it also has the same less obtrusive red/blue CA. It's also a very small lens.

I use it for video on my K-1, and it does a very good job.
New Member

Registered: September, 2018
Location: Nottingham
Posts: 10

1 user found this helpful
Lens Review Date: January 29, 2019 I can recommend this lens: Yes | Price: $30.00 | Rating: 8 

Pros: Light, lovely retro look and feel
Cons: noticed noise in poor light
Sharpness: 10    Aberrations: 8    Bokeh: 6    Handling: 10    Value: 10    Camera Used: Sony A6000   

I bought the lens as part of a bundle at a charity shop, so the $30 (20GBP) is an estimate

The lens has been used on a Sony A6000, all images shot in RAW and edited in Rawtherapee and GIMP.

I think I have a mint copy, well cared for (came with a little leather pouch lens holder) and was complete with skylight filters.

The lens is light and looks beautiful, looks fabulous on my camera, very retro.

The aperture clicks feel good and the focus ring is smooth.

I've shot landscapes, street shots and even some portraits and I am very pleased with the results.

In good light the lens has created some superb crisp, vibrant, colourful and sharp images.

In poor light I have noticed noise at ISO's where I would not expect noise with my Sony.

I would have given a 9/10 , but for the noise at low light (maybe I am too picky)

It's a keeper for sure

Council House Autumn Colours by Phil Howcroft, on Flickr

The old sweet shop by Phil Howcroft, on Flickr

Arnold Town's Number 1 Fan by Phil Howcroft, on Flickr
Veteran Member

Registered: March, 2013
Location: Montreal
Posts: 495
Lens Review Date: November 9, 2018 I can recommend this lens: Yes | Price: $75.00 | Rating: 9 

Pros: Sharpness, size, weight
Cons: None that come to mind
Sharpness: 9    Aberrations: 8    Bokeh: 7    Handling: 9    Value: 9    Camera Used: K-5II, K-1   

Surprisingly, now that I have a K-1 I am using this lens often. Surprisingly because I also have the K28/3.5. But the full frame body is so much heavier that I decided to take this one out a little more often. Fully satisfied with the results. Build and handling is typical M, which is to say excellent.

Registered: April, 2013
Location: Pittsburgh, PA
Posts: 430

1 user found this helpful
Lens Review Date: August 29, 2018 I can recommend this lens: Yes | Price: $45.00 | Rating: 9 

Pros: Lightweight, small, sharp enough, very good IQ
Sharpness: 8    Aberrations: 9    Bokeh: 7    Handling: 10    Value: 10    Camera Used: K-5II and K-1   

A fantastic lens that should be considered by everyone, even if it isn't a 9 or a 10 on the already inflated lens ratings. I have been able to compare it first hand to the esteemed K 28 3.5 and it is a lot closer than the price difference indicates (~$50 for the M and ~$100 for the K). I honestly would have been fine with keeping the M out of the two of them because they were that close. Focus throw is a joy to use, very small and lightweight... it's great for hiking with.

Here's some of my favorite photos that I've taken with it:

Yellow Leaf at Springfield Falls

A Change in Current and Color by James Baron, on Flickr

Springfield Falls
New Member

Registered: March, 2017
Location: Knoxville, TN
Posts: 1

1 user found this helpful
Lens Review Date: August 4, 2018 I can recommend this lens: Yes | Price: $70.00 | Rating: 10 

Pros: Sharpness, Color, Compact size, Light weight, Build, SMC coating
Cons: None for its size and price
Sharpness: 10    Aberrations: 10    Bokeh: 10    Handling: 10    Value: 10    Camera Used: Canon 60D   

I got this lens in April expecting it to replace my unimpressive EF-S 24mm f2.8 pancake lens from Canon. After four months' use, it is now my favorite lens even though the field of view of it on my 60D is a little bit narrow compared to that of the 24mm lens. But it is a matter of how I use it. Speaking of the lens itself, I would say it is almost perfect in terms of everything.

This lens is very sharp even when wide open at f3.5. When stepping down to f8, which is the ideal aperture for snapshot in street or traveling, the sharpness is simply crazy. In the same scene, it is way sharper than my M.Zuiko 12mm f2.0 lens for M43 camera which is well known for the resolution it delivers. It definitely beats the EF 50mm STM an EF-S 24mm STM lens.

Briefly speaking, the color it renders is vivid but not over-saturated. I understand color rendering is a strong point of Pentax lens, but the performance of this lens is exceptional. SMC-M 50mm f1.7 and Super-Takumar 50mm f1.4(7 elements version) are not as good.

I can hardly see flares with using this lens against bright light source. I believe the SMC coating techniques were quite mature in the M series era. Personally, I find its coating working more efficiently than those on any modern M43 lenses I have ever used.

Build quality:
I would not say it is built like a tank since there is no such tiny tank. That is the only difference.

See more pictures here:


Registered: September, 2014
Posts: 4,586

4 users found this helpful
Lens Review Date: June 26, 2018 I can recommend this lens: Yes | Price: $50.00 | Rating: 8 

Pros: Sharp from wide open, compact, well-built, covers FF
Cons: manual focus?
Sharpness: 9    Aberrations: 8    Bokeh: 7    Handling: 8    Value: 9    Camera Used: Various APS-C cameras   

The SMC-M 28/3.5 is a film-era, automatic aperture, manual focus wide angle lens covering FF sensor/film.
It has the FoV of a short-ish normal (42mm "equivalent") on APS-C.

It is very compact, and construction is all-metal.

My father bought this one new - the currency in Italy at the time was still the Italian Lire, so I just put a resonable dummy price because the price I paid would be unrealistic now.

This lens is quite sharp, even wide open, has a very precise rendering, and the bokeh isn't too bad either - although that's kind of a moot point on WA lenses since you rarely get to see it.

A weak spot is flare resistance, despite having the SMC coating. Don't put too many light sources in the picture or you'll get flares.

I'll let speak the pictures now.

Bokeh shot. it's not terrible, in fact I find it kinda pleasing. Shot at f/3.5

28_35_1 by Paolo Del Lungo, su Flickr

f/8 gets a red notch for ease of use: the manual calls it the "snapshot setting", together with the appropriate hyperfocal setting.
28_35_2 by Paolo Del Lungo, su Flickr

Flare is pretty bad with a strong light source inside the picture
28_35_3 by Paolo Del Lungo, su Flickr

At f/8 it's sharp across the frame
Snow_4 by Paolo Del Lungo, su Flickr

This shot has been developed from RAW, but microcontrast is excellent even in SOOC JPEGs
Verona_1 by Paolo Del Lungo, su Flickr
New Member

Registered: July, 2017
Location: Tbilisi
Posts: 17

2 users found this helpful
Lens Review Date: August 29, 2017 I can recommend this lens: Yes | Price: $40.00 | Rating: 9 

Pros: So many. See the review
Cons: M mount - M42 lenses are easier to use, not the best sharpness out there
Sharpness: 8    Aberrations: 9    Bokeh: 6    Handling: 10    Value: 9    Camera Used: K-50   

After I switched from Nikon, my lifelong love, I am still getting used to Pentax - and, well, this lens is among the Helios 44 that makes me believe that it was a right choice.

First I should tell how I use the camera: I use the reversal film color mode, shoot RAW, and -1 exposure compensation is a must as highlights are not possible to save, yet shadows nowadays are. I generally have noisy photos as a result, yet it is my choice.

First, the samples page:


Infinity Focus: I believe that if one is going for a wide-angle lens, even though 28mm is 42mm on crop sensors and is not wide any more, it is because it will be mostly used on infinity focus. This lens, contrary to Sigma Super Wide (24mm 2.8) which I had just before, is very good to perfect on infinity in terms of sharpness and contrast. I was scared to use Sigma for landscapes and street photography, yet I do not worry with this one. Please see second and third photos.

Closer Shots: Although the lens is very good in infinity, it does not catch up with close ups. It produces okay to usable photos, but not amazing photos like Sigma did or Helios does. Do not expect great sharpness and amazing details, but do not think that the lens cannot do anything. In closer shots, sharpness is not the best thing with this lens. Please see the first photo.

Because I did not know how to use M series lens, I was shooting wide open first couple of days (and questioning myself when I was stepping down to f/8 and still having the same DOF with 3.5. Thankfully this wonderful forum solved my problem and I can use it fully functional now), and sharpness was all so good, excluding far corners which are the weak points of all lenses. Yet there is a problem - at the corners, even at 3.5, this lens is not bad, and very close to the center in real life situations (i.e. there is no difference like at f/2 and f/4 with Helios). There is no great increase in sharpness from 3.5 to 8 at the center, as it is amazing all the way, but the corners get almost equal to the center at f/5.6 already.

In short, if you shoot infinity, and if you want to be able to use it with confidence full open, this lens will not upset you at all (partly thanks to 3.5 though, as it is stop-down already compared to f/2 or 2.8 lenses).


Contrast-wise the lens is from very good to perfect for me. Anyway I shoot RAW, and I want to arrange contrast to my taste later in PP. Yet the lens produces good enough contrast, and in PP it becomes excellent. Come on, who wants a super-contrasty RAW photo anyway? Ain't it against the idea of shooting RAW? See the photos, and say that I am wrong - if you can!


Wow. Just wow. Nothing else. Close to Helios 44, but the Pentax colors - especially in reversal film color mode. I love the combination between the lens and the camera.


I find this lens rather amazing in terms of flare control. To test, I shot against the sun, putting the sun at the corners directly, and just out of the frame. To be honest, I found it better than the kit lens, and head-to-head with Helios. Maybe because I did not use a really flare-resistant lens before (well, maybe Nikon 18-105?), I do not think that there is any problem in terms of control. Yes, contrast declines some, and yes, colors go mad a bit (but not much in either one), but isn't this the case with all the lenses (well, maybe excluding the 10-20 times more expensive lenses, which I could never use)? See the third photo.

Distortion and Chromatic Aberrations

Distortion is very easily solvable in PS (Camera Raw 9.12 has the built-in profile which is good enough to fix easily) and I have no problems with it. However much I messed with Sigma super wide, I could not get the results I wanted. Chromatic aberrations have not been a problem for me even at 3.5, I did not see any in any occasion (maybe there are but I did not come across), so it is very good in that sense too.


If you want bokeh, 28mm, and especially 3.5, surely is not your thing. But I can say that I found bokeh decent. It is not, of course, wonderful as with Helios 58/2, but isn't this normal? There are 2-3 flower shots that I did, and I can say that I am surprised with them as I expected worse. They surely are not great, but come on, not altogether bad also. See the first and last photos.

Handling and Build

It is light and small, just like what a lens should be. Yet also metal, and I feel confident with it. Usual old Pentax quality (compared to modern, cheap, dirty lenses). If you know Pentax quality, which I assume you do, there is nothing missing here. I may just say that.

Focus and Aperture Rings

Focusing is easy, and the focus throw is short - which is another reason to like this lens. The "window" gives the scales 0.3, 0.4, 0.5, 0.8, 1.5, 3, and infinity which is cool enough. From 1.5 to infinity, it is equal amount of turn with 0.8 to 1.5, and as it gets closer, the turn is getting comparably longer (yet short enough). My partner, who does not like using manual focus lenses, can focus with this easily. Also the aperture ring is snappy. There are half steps between full stops excluding the last full step. So the aperture values are 3.5 - 4.5 - 5.6 - 7.1(?) - 8 - 9(?) - 11 - 13 - 16 - 22. Not a big loss - who cares about the difference between 6.3 and 7.1 anyway?


A 40-50 dollar lens cannot be without problems, so let us look at them.

First of all, this lens lacks the 3D capability of Helios. So there is some lack of depth in the photos. I personally do not like looking at "photos", I want to be able to "reach and touch the subject", and with this lens I do not have that feeling.

Resolution ain't amazing as I said above, yet for the price, and at infinity focus, I did not see one that is really great.

The more the aperture blades, the better. This lens has only five while even the kit lens has six, and the Helios has 8 (I have 44M). So the bokeh, if there will be some, will be ugly if there will be the pentagon shape.

It sometimes overexposes, sometimes underexposes. So you should keep an eye on it.

The biggest problem for me is the last one: I like using M42 lenses because there is no need to use the green button. I compose, camera meters, I set the exposure compensation, and I shoot. With this one I rely on the green button which is something I do not like. So I would prefer it to have M42 bayonet, but I cannot do anything for it. Right?


A very good quality lens, especially for the price. I am trying to find out the PP kings, and it already has shown me that it is worth the price paid to it. If you will find for rather cheap, a bit more expensive than Helios but no more, definitely get it. Compared to Sigma super wide, this is a great lens for infinity focus shots (although in close shots Sigma was a monster compared, especially with the sharpness and resolution).
New Member

Registered: June, 2017
Posts: 14
Lens Review Date: July 31, 2017 I can recommend this lens: Yes | Price: $78.00 | Rating: 8 

Pros: Small size, metal barrel, smooth focus ring, great walk around lens
Cons: Ugly sunstars, heavy flaring, camera meter tends to overexpose scenes.
Sharpness: 8    Aberrations: 8    Bokeh: 6    Handling: 9    Value: 10    Camera Used: Pentax K1   

Seeing as there are no reviews of this lens on the K1, thought I'd chime in here. Recently purchased this little one, used but in excellent physical condition, for the equivalent of just about $78.00, in India.

I shoot product and food, and my style does not currently require me to have a wide angle lens. But I still wanted to try a wider perspective to see if I can work it into my style somehow. Soon i found this on the internet and bought it. Late that evening, tried some cityscapes and witnessed how my copy flares like nobody's business! So it became clear this is not for my night photography needs.

The next afternoon, I took it out to the local market, and that is where the lens began to give me good performance. Contrast is on the lower side, as is with both my M-series lenses, but stop it down to f/5.6 or f/8 and see it give you great results for social media! Also a very handy feature with the K1 is the ability to shoot in crop mode from the multi function dial on top, and that gives you super quick access to 28mm and 42mm equivalent focal lengths at will, which makes it all the more fun for casual street photography, and/or where the full 36mp resolution isn't very important to you.

I wouldn't recommend it for professional use, but that is simply because I wouldn't be changing my professional style based on this particular copy. But I plan to enjoy it while I have it, and so should anyone who wants to buy it, especially around this price.
Veteran Member

Registered: July, 2014
Location: Nagoya
Posts: 577

2 users found this helpful
Lens Review Date: December 19, 2016 I can recommend this lens: Yes | Price: $80.00 | Rating: 8 

Pros: Usual solid M series, nice colours
Cons: Bokeh (it's a 28mm, colour me amazed), doesn't stand up to latest sensors

Not much remains to be said about this lens - it's a good 28mm, nice colours and the build is typical fantastic M series. On film it does a great job at the classic 28mm focal length and I have no complaints. On digital, it's a little more complex. On the older K-m this lens is a stunner and it's a combo I use often - something about the old but colourful 10mp sensor and this bright little lens just makes them a perfect match. Put it on the 20mp K-S2, however, and things start to fall apart - zoom in and even at f8 images look noticeably unsharp everywhere except from the centre, even with the APS-C crop. That is hardly a valid criticism, however - this lens was designed the best part of 40 years before the K-S2 came out, so unless Pentax's designers were particularly forward thinking, they certainly didn't do a bad job.

Thus, I recommend this lens, but with certain caveats - namely, if you're using a newer 20mp+ digital camera, you may want to look elsewhere in this focal length. But for the film users, and those (like me) who like to pair their classic glass with an older digital body, this lens will be a valuable addition to your arsenal.
New Member

Registered: February, 2016
Location: lake constance
Posts: 1

1 user found this helpful
Lens Review Date: April 12, 2016 I can recommend this lens: Yes | Price: $50.00 | Rating: 10 

Pros: build, sharpness, light weight, color
Cons: none
Sharpness: 10    Aberrations: 10    Bokeh: 9    Handling: 10    Value: 10   

The Pentax M 3,5/28mm is a great lens for landscape and trips because of the advanced angle.
I always enjoy the neutral colors and in architecture photography i love that straight lines keep straight. The build is perfect as you know it from the "K" lenses.
Pick it, if you can - for low costs. I bought mine for ca. 50$, like new!

Registered: April, 2009
Location: Madrid, Spain
Posts: 6,575

2 users found this helpful
Lens Review Date: October 19, 2015 I can recommend this lens: Yes | Price: $60.00 | Rating: 8 

Pros: Small, light-weight, very sharp
Cons: Slow, lacks 3D quality to results
Sharpness: 9    Aberrations: 8    Bokeh: 7    Handling: 8    Value: 8    Camera Used: K200D, K3   

This lens is very good, especially if simple sharpness is what is required. Build quality is typically superb for the M series. It's extremely sharp even wide open. Colour and contrast are very good but not excellent.

If you're into more normal focal lengths for landscape photography or you simply want a lens which is compact & very sharp wide open, then this is ideal. On a DSLR this means you can use it in A mode and not worry that your photos won't be sharp because you didn't stop down.

I have compared this lens to various other similar models.
  • Compared to M 28/2.8 (mark I). The f/3.5 version is sharper with much better colour and contrast
  • Compared to M 28/2.8 (mark II - optically identical to the A series lens). The f/3.5 is still sharper but no longer wins in colour and contrast - the f/2.8 is superior in these regards. I think the f/2.8 has more distortion though.
  • Compared to K 28/3.5. The K version is optically superior. It's just as sharp and has better colour and contrast and is capable of giving a 3D quality to photos, which the M version isn't. However, the K is much bigger and heavier.

In the end I sold this lens and kept the K version for sheer IQ and got an A 28mm f/2.8 for a smaller/lighter/faster version. I found that the images from the K version didn't need to be post-processed to give them some life and vibrancy in the same way as those from the M version. If you want a single lens though that's light, small and sharp wide open then the f/3.5 version is the best compromise available in the old manual 28mm lenses.

Edit: I got a second copy for a bargain price and it didn't focus to infinity, so be careful as this may be a common problem.

Some samples:

by Jonathan MacDonald, on Flickr

DSCF1080a M 28mm 3.5
by Jonathan MacDonald, on Flickr
Add Review of SMC Pentax-M 28mm F3.5

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