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SMC Pentax-A 50mm F2 Review RSS Feed

SMC Pentax-A 50mm F2

Reviews Views Date of last review
73 233,125 Fri December 18, 2020
Recommended By Average Price Average User Rating
90% of reviewers $32.61 7.93
SMC Pentax-A 50mm F2

SMC Pentax-A 50mm F2
SMC Pentax-A 50mm F2

The SMC Pentax-A 50mm F2 is a compact standard lens released as a cheaper kit lens for Pentax auto-aperture bodies. It supports all exposure modes.

SMC Pentax-A 50mm F2
©, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (A setting)
Automatic, 6 blades
5 elements, 5 groups
Mount Variant
Check camera compatibility
Max. Aperture
Min. Aperture
Min. Focus
45 cm
Max. Magnification
Filter Size
49 mm
Internal Focus
Field of View (Diag. / Horiz.)

APS-C: 32 ° / 27 °
Full frame: 47 ° / 40 °
Various types
Lens Cap
Plastic clip-on
Weather Sealing
Other Features
Diam x Length
63 x 31 mm
145 g
Production Years
1985 to 1998
Engraved Name
smc PENTAX-A 1:2 50mm
Product Code
User reviews
Lens was sold without case and hood. Several hoods will fit like PH-S49 (50mm) and screw-in type metal and folding rubber hoods
Manual FocusAperture RingAutomatic ApertureFull-Frame SupportDiscontinued
Price History:

Add Review of SMC Pentax-A 50mm F2
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-15 of 73
New Member

Registered: November, 2020
Posts: 5
Lens Review Date: December 18, 2020 I can recommend this lens: Yes | Price: $40.00 | Rating: 6 

Pros: Cheap
Cons: Clunky and feels cheap
Sharpness: 7    Aberrations: 7    Bokeh: 6    Handling: 4    Value: 6    Camera Used: Pentax K1000 SE   

The lens itself is decent, but just decent. It seems to have pretty good coatings on it.
The body feels really cheap and plasticy and does not inspire the same confidence as something like a metal constructed lens. The aperture ring is clunky and sometimes fails to hold the aperture at f/2.
It's great for everyday shooting and someone who's learning photography, but I wouldn't go out and buy one just to have it. The one I have came with the camera I purchased.
The lens itself is a PITA to service and is unnecessarily complicated. There's a gazillion small parts that could potentially get lost in the process of servicing it, so you must be very careful.
New Member

Registered: June, 2020
Posts: 24
Lens Review Date: November 29, 2020 I can recommend this lens: Yes | Price: $30.00 | Rating: 10 

Pros: small, fast enough for most of photos, affordable, light, sharp
Cons: aperture ring feels stiff
Sharpness: 10    Aberrations: 10    Bokeh: 9    Handling: 9    Value: 10    Camera Used: Pentax K110D   

Excellent handling and performance. This lightweight little prime highly enjoyable to use and results are great for it's price.

My unit had a stiff aperture ring but because of "A" mode using in camera controls is possible, it doesn't affect my usage.
New Member

Registered: March, 2016
Posts: 5

2 users found this helpful
Lens Review Date: January 13, 2020 I can recommend this lens: Yes | Price: $15.00 | Rating: 10 

Pros: Covers medium format digital sensor without any vignetting
Cons: Less sharpness bit made up with excellent colors and bokeh
Sharpness: 8    Aberrations: 10    Bokeh: 7    Handling: 9    Value: 10    Camera Used: Fuji GFX 50R MF   

Lens covers medium format sensor when adapter. No vignetting whatsoever.
Beautiful colors relatively fine sharpness as compared to mf pentax equivalent lenses and dirt cheap in price but not in value.

I couldn't upload the photos because this website is still stuck in 1997.

Registered: September, 2017
Location: Medellín
Posts: 1,313
Lens Review Date: January 10, 2020 I can recommend this lens: Yes | Price: $10.00 | Rating: 8 

Pros: Small, pankace like, light.
Sharpness: 9    Aberrations: 8    Bokeh: 7    Handling: 10    Value: 10    Camera Used: Film bodies, K-5   

It won't win any awards, but it's discrete and a good all-rounder. Small, plastic, cheap, light.
New Member

Registered: February, 2019
Posts: 12
Lens Review Date: January 6, 2020 I can recommend this lens: Yes | Price: $15.00 | Rating: 8 

Pros: As good as the f1.7 version for 90% of photos
Cons: Plastic feel and behaviour
Sharpness: 9    Aberrations: 9    Bokeh: 8    Handling: 6    Value: 8    Camera Used: Film   

A nice little lightweight lens. Many people think an f2 50mm is completely worse than a f1.7 version, but it's almost exactly the same except it struggles in low light as the glass is smaller. It cost less, too. As with all A series SMC lenses it's mainly plastic and through the years it breaks and degrades and malfunctions. And they are really horrible to take apart and service if you buy a dirty one. Because A series lenses are plastic, they are variable in quality for ease of function; some work well, some grind, some have dead focus spots, etc. Buy the M series if you want comparable optics but with finer build quality.
Forum Member

Registered: March, 2011
Location: Ontario
Posts: 89
Lens Review Date: December 1, 2019 I can recommend this lens: Yes | Price: $4.00 | Rating: 9 

Pros: Small, effective and a huge bargain.
Cons: For the price, there is no much I can add here
Sharpness: 9    Aberrations: 8    Bokeh: 8    Handling: 9    Value: 10    Camera Used: Super A, K3ii, PZ20   

I picked up mine at the local Sally-Ann for about $4US. For that price this is the best value out there. Do I have a better 50mm lens? Yeah for sure. I own: A50/1.7, FA50/1.4, K50/1.4, M50/4 macro, FA50/2,8 macro, Super-Tak 50/1.4 and a SMC Tak 55/1.8. They all have better image quality, but they are also all bigger (except the A50/1.7 - its exactly the same size), heavier and cost me a lot more. Even the cheapest one, the A50/1.7 was more than 15 times the price but it's not 15 times the lens.

Once stopped down to 2.8 or more it's as sharp as you could need for 90% of applications. Color rendition is Pentax great and contrast is excellent. You could use this for 11x14 or even 16x20 enlargements without a concern. It has the coveted 'A' setting, focus is smooth and the aperture setting is positive and precise even if the ring is plastic - which does not bother me one bit. The aperture setting is not quite as smooth as M and K series lenses, but is better in that respect than the F or FA series. But on today's cameras how often do you take it off 'A'.

This lens has an overall rating of over 8, and it deserves that on it's merits alone, not taking the value into account. Taking the value into account it's a solid 10. If you can pick up one of these for under $30, go for it. At that price is a heck of a bargain. At $4 it's like winning a lottery!

Mine has a permanent home on my PZ20 and is a backup for the A50/1.7 on my Super A.
New Member

Registered: November, 2016
Posts: 7
Lens Review Date: August 10, 2019 I can recommend this lens: Yes | Price: $35.00 | Rating: 8 

Pros: Small, good image quality, A-setting
Cons: Uses lot of plastic
Sharpness: 7    Aberrations: 7    Bokeh: 8    Handling: 8    Value: 8    Camera Used: Pentax K-30   

I keep this lens on my camera because its lightweight, very small, and has good image quality. It does use a lot of plastic, which is good and bad. Plastic is lightweight, but plastic is not as tough as metal and may brittle with age. Image quality is very good, but unfortunately not as good as the Ricoh XR Rikenon 50mm F2 lens. However, for the price of $35 US, I can't complain.
New Member

Registered: June, 2019
Posts: 1
Lens Review Date: June 19, 2019 I can recommend this lens: Yes | Price: $5.00 | Rating: 8 

Pros: Very small and light weight. Cheap
Cons: Aperture ring feels very stiff
Sharpness: 7    Aberrations: 7    Bokeh: 9    Handling: 7    Value: 8    Camera Used: Sony A6000   

This lens is great for when I wanna use a lightweight set up. The aperture ring is very stiff so usually I tend to not change it much.
It may not be the sharpest but the colors and contrast make up for it.
Forum Member

Registered: September, 2012
Location: Tokyo
Posts: 72

1 user found this helpful
Lens Review Date: September 10, 2018 I can recommend this lens: Yes | Price: $50.00 | Rating: 10 

Pros: Tiny, Light, Smooth Focusing, Auto Aperture
Cons: None for the price

A lens that were it made today would have to be premium priced for its combination of compact size, excellent handling and performance. Capable of very good results. Automatic aperture makes it easy to use on any Pentax DSLR, and full-frame means you can re-use it on a mirrorless or Pentax full size sensor camera too should you end up there one day.

Aperture ring is a little crunchy but leave it on A and use the camera controls. Focusing is just as smooth and tactile as any Takumar, Leica or Nikon manual lens I own.

I use it on my 2005 Pentax istDS, which makes for a very small and light package. Example in first picture, followed by photos taken with this camera/lens combination.


Registered: November, 2017
Location: Garden City, NY
Posts: 5,905
Lens Review Date: November 9, 2017 I can recommend this lens: Yes | Price: N/A | Rating: 8 

Pros: Sharp - easy to focus - handling
Cons: Bit slow
Sharpness: 9    Bokeh: 8    Handling: 10    Value: 9    Camera Used: K-50, K-1000   

I got this lens with my K-1000 when I got her off ebay... ~$50 all together maybe? While I know I have used the lens with my K-50, all the pictures below were taken on Film (K-1000).

I'm not so technical, so I rather show some examples of the lens as a review.

This was my go to lens for a while; it is extremely easy to use, which aided me very much to learn Manual photography (K-1000).

While most of the shots presented for review here are taken at mid to minimum aperture (hence the big depth of field), the lens does present nice bokeh when properly used (see the orange picture for example).

Great beginner glass - it makes you solve issues of poor lighting, and gets you to improvise a bit... I'd recommend.

Junior Member

Registered: June, 2015
Location: Százhalombatta, Hungary
Posts: 37
Lens Review Date: October 13, 2016 I can recommend this lens: Yes | Price: $29.00 | Rating: 8 

Pros: Smooth focusing, "A" setting, quite sharp from f/2.8 onwards, compactness
Cons: The plastic aperture ring is definitely its weakness
Sharpness: 8    Aberrations: 8    Bokeh: 7    Handling: 10    Value: 9    Camera Used: Pentax K10D   

I got this lens mainly for the reason that it is an "A" lens. This is my second 50mm, the other being an Auto Chinon MC 50mm f/1.4. Although the other is better optically, this one makes shooting a breeze, since I can just forget about stop-down metering and simply focus and shoot, which makes this lens very-very useful, even on a modern DSLR. My K10D is equipped with a split screen, which improves the usability of this lens.
My copy however isn't in mint condition; the lens has some dust inside, not visible on the images though and the aperture ring struggles, when I switch it from "A" to manual mode. However, I do not ever plan on using it manually, since the "A" setting is the sole reason I purchased this glass. The focusing ring turns very smoothly and image quality-wise the lens performs very well. It's perfectly useable wide open, but it significantly improves around f/2.8 and onward.
Another plus is that I only paid 8000 HUF for this, which is around 29 USD... you can get no lens cheaper than this in my country.

Overall I would give this lens a 9 for its price-performance ratio, but it wouldn't be correct, since the 1.7 version is better. I give this a strong 8 therefore.
Autumn Leaves ~ Pentax K10D + smc PENTAX-A 50mm f/2 ~ f/2.8 ; 50mm; 1/250s ; ISO200
Veteran Member

Registered: July, 2014
Location: Nagoya
Posts: 577
Lens Review Date: August 13, 2016 I can recommend this lens: Yes | Price: $25.00 | Rating: 9 

Pros: Small, light, Pentax rendering
Cons: Nothing for the price

This lens (along with its M sibling) gets a bad rep, which seems to be mainly based on the fact that it's slower and cheaper. It really is still an excellent lens. Sharp (in fact, sharper and more usable wide open than my A50/1.7), nice bokeh, lovely Pentax handling and colours, and so tiny it's essentially pocketable.

The A50/1.7 is probably my favourite Pentax 50mm prime, but if I only had the f2 version instead I certainly wouldn't be complaining.

Wide open on K100D:
New Member

Registered: July, 2016
Posts: 6
Lens Review Date: July 13, 2016 I can recommend this lens: Yes | Price: $25.00 | Rating: 8 

Pros: Cost. Portraits.
Cons: Manual Focus.
Sharpness: 7    Aberrations: 8    Bokeh: 8    Handling: 8    Value: 8    Camera Used: Pentax K Bodies   

Not a fan of primes or manual focus. That's just me... I'm fully aware many people love primes and they produce great photos. I like the practicality of a zoom.

However, every now and then I get a good photo from this lens at F2. Good for portraits and fun to rekindle the manual focusing approach- at least for portraits.

And I dig being able to stick a film lens on a digital body - just to be different but also frugal! Seems to catch people's attention.

Forum Member

Registered: December, 2015
Posts: 50
Lens Review Date: May 4, 2016 I can recommend this lens: Yes | Price: $24.00 | Rating: 8 

Pros: decent and cheap
Cons: decent and cheap
Sharpness: 9    Aberrations: 8    Bokeh: 8    Handling: 8    Value: 10    Camera Used: Pentax K-50   

So, here's the deal: it's a good lens, but... the 50mm A f1.7 does better. It's as simple as that.

Color rendering is good, sharpness too, handling too, bla bla bla. It's not really an "exciting" lens, but it does the job.

Buy the 1.7 version if you can, otherwise this is nearly as good, for cheaper.

I don't have much to add.
Forum Member

Registered: February, 2016
Location: Moab, Utah
Posts: 90

1 user found this helpful
Lens Review Date: February 18, 2016 I can recommend this lens: Yes | Price: $5.00 | Rating: 8 

Pros: Sharp, color rendering
Cons: bokeh, only 6 aperture blades
Sharpness: 9    Aberrations: 8    Bokeh: 6    Handling: 10    Value: 9    Camera Used: Sony A7s, A7m2   

This lens is the lens I used in high school with the camera Mr. Schaeffer let me borrow for journalism class . I also own the 1.4 which he would never let me touch. This lens, as far as I can tell is just as sharp as the f1.4, colors just as good. It's sharper than my Sony 28-70 kit lens. Where it lacks is the 6 blades of the aperture just don't make for cool looking out of focus stuff. It's not bad, but not the same wow factor as the 1.4. I've had at least 3 of these. They're easy to take apart and get any dust out of and put back together. Really a pleasure to use this lens too. It just feels right.
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