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6 Days Ago   #1
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Question about an old SMC M 35-70mm F2.8-3.5 lens

I'm wondering at what focal length does the F stop go from 2.8 to 3.5.Can't tell by looking through the viewfinder

6 Days Ago   #2
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Hi Robert,

If you take a look at the review on the bottom of this page: SMC Pentax-M 35-70mm F2.8-3.5 Reviews - M Zoom Lenses - Pentax Lens Reviews & Lens Database, I believe Petrus_One has figured out this question.

Nice lens - I own this one too, and love it.

Best,
Svend
6 Days Ago   #3
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QuoteOriginally posted by Viking42 Quote
Hi Robert,

If you take a look at the review on the bottom of this page: SMC Pentax-M 35-70mm F2.8-3.5 Reviews - M Zoom Lenses - Pentax Lens Reviews & Lens Database, I believe Petrus_One has figured out this question.

Nice lens - I own this one too, and love it.

Best,
Svend
Thanks for the explanation
6 Days Ago   #4
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QuoteOriginally posted by Viking42 Quote
Hi Robert,

I believe Petrus_One has figured out this question.
I also own this lens and agree it is possible to establish where the lens changes its widest aperture by putting it on a camera and taking a meter reading.

Note that this affects the entire aperture range, not just wide open. So at 35mm the lens is a f2.8-f22 lens. At 70mm the lens is a f3.5-f28 lens. that is why there are two aperture markers...one in red and one in green.


Last edited by pschlute; 6 Days Ago at 01:34 PM.
5 Days Ago   #5
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It is a nice lens, but push/pull zoom is not something I'm super fond of. But I use M 35-70 as a "kit lens" for my Sony a7.
But I can understand the purpose of push/pull zoom on manual focus zoom lenses as the focus ring is used for zoom too and you can zoom and focus at the same time.
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