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Pentax Lens Review Database » Film Era Pentax K-Mount Lenses » A Prime Lenses
SMC Pentax-A 20mm F2.8 Review RSS Feed

SMC Pentax-A 20mm F2.8

Sharpness 
 8.9
Aberrations 
 8.4
Bokeh 
 7.9
Handling 
 9.5
Value 
 9.2
Reviews Views Date of last review
22 152,301 Wed June 14, 2023
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Recommended By Average Price Average User Rating
95% of reviewers $425.72 9.09
SMC Pentax-A 20mm F2.8

SMC Pentax-A 20mm F2.8
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SMC Pentax-A 20mm F2.8
supersize
SMC Pentax-A 20mm F2.8
supersize

Description:
The SMC Pentax-A 20mm F2.8 lens is faster than the M or K 20mm lenses, and it was succeeded by an FA autofocus version with the same optics formula.



SMC Pentax-A 20mm F2.8
© www.pentaxforums.com, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (A setting)
Diaphragm
Automatic, 5 blades
Optics
10 elements, 9 groups
Mount Variant
KA
Check camera compatibility
Max. Aperture
F2.8
Min. Aperture
F22
Focusing
Manual
Min. Focus
25 cm
Max. Magnification
0.12x
Filter Size
67 mm
Internal Focus
No
Field of View (Diag. / Horiz.)

APS-C: 72 ° / 62 °
Full frame: 94 ° / 84 °
Hood
MH-RB 67mm
Case
Hard case HD-100
Lens Cap
Plastic clip-on
Coating
SMC
Weather Sealing
No
Other Features
Diam x Length
70 x 43.5 mm
Weight
245 g
Production Years
1985 to 2001
Engraved Name
smc PENTAX-A 1:2.8 20mm
Product Code
22870, 22875
Reviews
User reviews
Notes
The lens hood was not included with the lens
Features:
Manual FocusAperture RingAutomatic ApertureFull-Frame SupportDiscontinued
Price History:



Add Review of SMC Pentax-A 20mm F2.8
Author:
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 16-22 of 22
New Member

Registered: December, 2010
Location: St. Paul, MN
Posts: 7

2 users found this helpful
Review Date: March 30, 2011 Recommended | Price: $400.00 | Rating: 10 

 
Pros: Sharp!, reasonable distortions, f/2.8, size, love the focal length
Cons: None
Sharpness: 10    Aberrations: 7    Bokeh: 7    Handling: 10    Value: 10   

Purchased in 1990 for just under $400.

This was my No. 1 lens for films. It replaced my M-Series 20mm f/4, which I also loved, but I really wanted f/2.8. I love this focal length and I love this lens. They'll bury me with this one.

CA very well controlled (even compared to current lenses).

People are generally blown away by the perspective and the sharpness, contrast, and color rendition of this lens. Sharp corner to corner. Blow it up to 16X20!

Foreground! Amazing hyper-focal DOF at f/8 - f/16. Flare very well controlled: Critical on this kind of FL. I don't miss a lens-hood -- I'm old-school, I always just used my hand.

Great for indoors shots and low-light conditions. f/2.8 allows Kodachrome 64 star-trails!

http://www.berettaconsulting.com/barbarossa/WT_Big_Show/04%20New%20Zealand/W...%20Zealand.jpg

Some scanned KR64:

http://www.berettaconsulting.com/barbarossa/WT_Big_Show/04%20New%20Zealand/W...%20Zealand.jpg

http://www.berettaconsulting.com/barbarossa/Miscellaneous/Misc_10-Mar-10/Lsc...7%20Nevada.jpg

http://www.berettaconsulting.com/barbarossa/Landscape/France%2097%20Gigondas%20Vines.jpg

http://www.berettaconsulting.com/barbarossa/Landscape/France%2097%20Glanum%20Columns.jpg

http://www.berettaconsulting.com/barbarossa/Landscape/France%2097%20Stony%20Vineyard.jpg

http://www.flickr.com/photos/jim_blilie_photo/4650610389/in/set-72157623970607501

http://www.berettaconsulting.com/barbarossa/WT_Big_Show/05%20Australia/WT%20...0Australia.jpg

http://www.berettaconsulting.com/barbarossa/WT_Big_Show/04%20New%20Zealand/W...%20Zealand.jpg

http://www.berettaconsulting.com/barbarossa/WT_Big_Show/04%20New%20Zealand/W...%20Zealand.jpg

http://www.berettaconsulting.com/barbarossa/Utah_96/1996-04%20Utah%20Trip%20204.jpg

http://www.berettaconsulting.com/barbarossa/Utah_96/1996-04%20Utah%20Trip%20...e%20Canyon.jpg

http://www.berettaconsulting.com/barbarossa/Utah_96/1996-04%20Utah%20Trip%20...e%20Canyon.jpg

Purchased NEW. Can't find the drop-down for New/Used gents.
   
Review Date: May 25, 2010 Recommended | Price: $650.00 | Rating: 10 

 
Pros: Sharp, No visible distortion, no flare with correct hood.
Cons: rare

Great Lens. Usable at any F-stops, for close objects can use wide open with great result. For landscape daytime optimum is F8, in darkness from 2.8 till 5.6, also in bulb mode excellent results up to F11. Also using it on Canon body - Fantastic Colors and Resolution. Some corner color fringing easily removing by any software. In photoshop only check all edges - thats it. Very little distortion.
Some pictures can find @ http://www.flickr.com/photos/22216941@N03/
   
Inactive Account

Registered: April, 2009
Location: New York
Posts: 2
Review Date: May 12, 2010 Recommended | Price: $599.00 | Rating: 10 

 
Pros: Small, Sharp, Manual
Cons: None

Sharp from f2.8 and real good on f8-f11. Use it on crop K7 Body and
with adapter on Canon 5D full frame. Full frame shows more resolution
and better borders on f8 compared with f8 on cropped body.
Overall very good lens. Much better than Canon or Nikon 20mm primes.
   
Veteran Member

Registered: January, 2007
Location: Warsaw
Posts: 338
Review Date: February 9, 2010 Recommended | Price: $300.00 | Rating: 8 

 
Pros: small, quite sharp
Cons: low contrast

It is small, cute lens. Quite sharp from f2.8 and better from f8. It has low contrast. I compared it with DA12-24 & K20D and it looks A20 is better at f8 on borders. With strong sun light it gives low contrast.
Overall good wide lens for APS-C.



more samples at:
http://www.pbase.com/piotreks/a20
   
New Member

Registered: December, 2009
Location: Egham, Surrey
Posts: 1

6 users found this helpful
Review Date: December 2, 2009 Recommended | Price: $550.00 | Rating: 9 

 
Pros: Crispy sharp, good detail and color redition, low distortion
Cons: A little expensive

It is one of my favorite lenses. I always use it with 1.6X DSLR and then the focal length becomes approximately 35mm. It is very useful lens delivering impressive picture quality.

Although it is equipped with B+W UV filter, I found no flare or ghost light when I shoot silhouette or night shot with many lights at the background. Therefore, I don't think I want to get lens hood for it.





   
Site Supporter

Registered: February, 2009
Location: Indianapolis
Posts: 527

1 user found this helpful
Review Date: March 4, 2009 Recommended | Price: $275.00 | Rating: 10 

 
Pros: Super sharp corner to corner
Cons: Lens hood rare and expensive

One of my truly most enjoyable lenses. I used it on film where it seemed almost too wide for my needs, but it has been a comfortable friend on my digital body.

If you ever find the hood for the lens I highly recommend getting it. It is not only a useful accessory it makes this lens look super great.
   
Senior Member

Registered: January, 2008
Location: Bondi, Australia
Posts: 206

1 user found this helpful
Review Date: January 29, 2008 Recommended | Price: $420.00 | Rating: 9 

 
Pros: fast, sharp, uses comonly available filters,low distortion
Cons: expensive, impossible to find second hand

I tested this lens side by side against the 20 f/4 M, expecting the modest f/4 to be better optically.... The 20 f/2.8 absolutely KILLED it , much to my surprise . Being a wide angle freak, this is pretty well my standard lens
Add Review of SMC Pentax-A 20mm F2.8



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