Forgot Password
Pentax Camera Forums Home
 
Log in or register to remove ads.

Pentax Lens Review Database » Film Era Pentax K-Mount Lenses » M Prime Lenses
SMC Pentax-M 20mm F4 Review RSS Feed

SMC Pentax-M 20mm F4

Sharpness 
 8.6
Aberrations 
 8.3
Bokeh 
 7.4
Handling 
 9.3
Value 
 9.2
Reviews Views Date of last review
32 172,784 Tue April 20, 2021
spacer
Recommended By Average Price Average User Rating
97% of reviewers $243.84 8.84
SMC Pentax-M 20mm F4

SMC Pentax-M 20mm F4
supersize
SMC Pentax-M 20mm F4
supersize

Description:
This relatively slow extreme-wide-angle lens was more compact than its K predecessor.



SMC Pentax-M 20mm F4
© www.pentaxforums.com, sharable with attribution
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (no A setting)
Diaphragm
Automatic, 5 blades
Optics
8 elements, 8 groups
Mount Variant
K
Check camera compatibility
Max. Aperture
F4
Min. Aperture
F22
Focusing
Manual
Min. Focus
25 cm
Max. Magnification
0.12x
Filter Size
49 mm
Internal Focus
No
Field of View (Diag. / Horiz.)

APS-C: 72 ° / 62 °
Full frame: 94 ° / 84 °
Hood
Dedicated rectangular clip-on hood
Case
Dedicated hard case
Lens Cap
Plastic clip-on
Coating
SMC
Weather Sealing
No
Other Features
Diam x Length
63 x 29.5 mm (2.5 x 1.16 in.)
Weight
150 g (5.3 oz.)
Production Years
1977 to 1984
Engraved Name
smc PENTAX-M 1:4 20mm
Product Code
22830
Reviews
User reviews
Features:
Manual FocusAperture RingFull-Frame SupportDiscontinued
Price History:



Add Review of SMC Pentax-M 20mm F4
Author:
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 31-32 of 32
Inactive Account

Registered: February, 2007
Location: Italy
Posts: 2

1 user found this helpful
Review Date: February 17, 2007 Recommended | Rating: 9 

 
Pros: sharp, sharp, sharp even wide open, not too much vignetting, low distortion, light weight
Cons: still has distortion

This lens has a very good color rendition and gave me great sunset landscapes on the seaside; to be a 20mm lens it has low distortion, but it STILL retain a few...
So, using it now on my Pentax K110d instead of the 18-55, I get only a marginal distortion reduction.

Vignetting is low and resolution and contrast are HIGH.
   
Senior Member

Registered: October, 2006
Location: Masachusetts
Posts: 243
Review Date: January 21, 2007 Recommended | Rating: 8 

 
Pros: Small, light, sharp
Cons: Corners soft wide open

This is a light and reasonably sharp and contrasty lens, I used it a lot with the MX cameras and Kodachrome. No noticeable vignetting, although I never did a formal test. I do believe that the corners are a bit soft wide open, but that clears up if you stop it down a step or two.

Great for throwing in a lightweight bag, works with all the old film cameras and the new digitals. It's really only a moderate wide on the reduced sensors of the new cameras, but for small groups it works quite well.
Add Review of SMC Pentax-M 20mm F4



All times are GMT -7. The time now is 05:27 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top