Forgot Password
Pentax Camera Forums Home

Third-Party Pentax Lenses - Reviews and Database » Sigma Lenses » Legacy Zoom Lenses
Sigma -y; I 21-35mm F/3.5 - 4 Review RSS Feed

Sigma -y; I 21-35mm F/3.5 - 4

Reviews Views Date of last review
2 12,373 Tue April 9, 2019
Recommended By Average Price Average User Rating
100% of reviewers $114.00 8.50
Sigma -y; I 21-35mm F/3.5 - 4

Sigma -y; I 21-35mm F/3.5 - 4
Sigma -y; I 21-35mm F/3.5 - 4
Sigma -y; I 21-35mm F/3.5 - 4
Sigma -y; I 21-35mm F/3.5 - 4
Sigma -y; I 21-35mm F/3.5 - 4

This is the first, 2 ring version of sigma's "gamma" super wide zoom - MF only. Introduced in 1979 - Sigma museum page here.

Optical schema on wikipedia.

Sigma Zoom 21-35mm F3.5-4
Pentax K mount
Sigma Manufacture # 641-408
Made in Japan
Multi Coated Optics
All Metal construction.
Mount Type: Pentax K
Price History:

Add Review of Sigma -y; I 21-35mm F/3.5 - 4
Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-2 of 2
Senior Member

Registered: January, 2018
Posts: 224
Lens Review Date: April 9, 2019 I can recommend this lens: Yes | Price: None indicated | Rating: 9 

Sharpness: 9    Aberrations: 9    Bokeh: 10    Handling: 9    Value: 10    Camera Used: *ist DS    New Or Used: Used   

My example of this lens is in 42-screw mount, so it's important to use an accurate adaptor for the built-in lens hood to line up correctly once the lens is mounted. When used with a genuine Pentax 42-PK adaptor it's fine
Other than that ... everything good! I've had mine for a very long time, it doesn't get as much use now that I'm using APS-C as it did when I was using film, but it doesn't disappoint. There's a certain satisfaction in knowing that the investment I made in an "old-fashioned" screw-mount manual-focus lens all those years ago can still pay off!
Veteran Member

Registered: August, 2013
Posts: 1,457
Lens Review Date: January 23, 2015 I can recommend this lens: Yes | Price: $114.00 | Rating: 8 

Pros: Solid Build , Short Throw , Good Sharpness
Cons: None
Sharpness: 8    Aberrations: 8    Bokeh: 8    Handling: 9    Value: 8    Camera Used: K30 and K3   

I just got this and decided to pull it out and give her a go.
I have only heard of one other copy of this lens so I consider it Rare.

Overall a very solid lens. Build is impeccable. All metal construction including built in lens hood.
Front lens hood offers complete coverage. It is Non-Rotating so using filters is no problem.
Even though it has a Petal type built in hood , you can still use a 67mm filter of your choice.
It also has a separate set of threads up front for a 72mm Lens cap....Vey nice feature.

F stop range is 3.5-22 with half stop clicks. Aperture ring is tight with positive stops.
There is no "A' setting on this lens.

Now lets get down to performance........
Once again this is a tank of a lens. Super solid and tight.
Throw is about 90 degrees or slightly less....very nice.
Front hood stays stationary so no problem there.

I slapped it on my k30 first and played around outside for a while.
Bokeh is nice throughout the range , but nothing sensational.
I noticed no aberrations of any kind , and even shooting sideways into bright backgounds noticed little flair.
This lens shows some variation though for sharpness. I noticed it quite a bit sharper at the narrower end wide open , than at the wide end wide open.
I stopped down to about f5.6 and its gone.
Being manual its a bit hard for me to nail focus every time. I don't really blame the lens as I have only used it for one day and haven't learned its quality yet and sweet spots.
I did notice focus seems to be spot on in viewfinder but a bit backfocused in Live View.
Overall this lens rather surprised me....the shapness is there if you want to work a bit to achieve it !

I paid $114 for mine. But I knew the man I bought it from and it was never used and had box , warranty , and case...NEW , even though it was made in 1980. I simply couldn't pass it up.

Over all I don't regret it one bit. I was wanting a 17-35 and stumbled across this.
If you should see one of these ...Grab it for a price that suits you. Its very useable and the image quality is there for what it is.
If I could score it for image alone... 8.7

Image quality is far better than the 18-55WR that I just sold. But NO....its not AF so everyone beat it up for that , and Lack of "A" setting.
Add Review of Sigma -y; I 21-35mm F/3.5 - 4

All times are GMT -7. The time now is 05:23 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]