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07-14-2021, 07:02 PM   #1
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vintage lens compatability

Hi all,

I know that Pentax bodies are designed take legacy lenses but maybe there's a limit? I'm going through old equipment and giving gear to a couple 4-H kids. But I thought I'd hang onto a macro lens I found. It's a Promaster Spectrum 7 28-70mm 2.8-4.2 that I used on a SuperProgram in the 80s. I thought I could mount on the K-3 but I'm not having any success getting it to work and I don't want to break anything. Am I overlooking something, or does the design not apply to 3rd-party lenses?

07-14-2021, 07:10 PM   #2
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if it worked on the super program it will work on the K-3!! maybe contacts are dirty............
07-14-2021, 07:22 PM   #3
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when you say that it doesn't work - does it mount on the camera?

if it does mount, are you getting an error message, such as "F---"?
07-14-2021, 07:35 PM   #4
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What I mean is, I can't get it to couple.

07-14-2021, 07:51 PM   #5
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It would be helpful for the forum to diagnose if you make a photo of the mount and share in this thread.
07-14-2021, 07:56 PM   #6
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Interesting, Super Program and K3 are using the same K mount. I never have a problem mounting older K, M, A, F, FA lenses on my K3.
Maybe clean the rear metal part of the lens to remove any dust and or whatever substances might be correcting over years of unused?
07-14-2021, 08:45 PM - 2 Likes   #7
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The power zoom contacts may get in way of large shields that some lenses have. A picture of the rear of the lens may help diagnose this.

Vivitar p/k lens not mounting on K-5 - PentaxForums.com

07-14-2021, 08:51 PM - 2 Likes   #8
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There are a few old third-party lenses that have a metal bit that gets in the way.
07-14-2021, 09:41 PM - 2 Likes   #9
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QuoteOriginally posted by vonBaloney Quote
There are a few old third-party lenses that have a metal bit that gets in the way.
the extra long bit that protects the aperture lever - that may be the issue right there....
07-14-2021, 11:09 PM   #10
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QuoteOriginally posted by CountryGirl Quote
What I mean is, I can't get it to couple.
Couple?
07-15-2021, 12:35 AM - 1 Like   #11
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I had the same issue with my Vivitar 70-210 1:4.5 Macro Focusing Zoom, because of its long protection shield of the aperture lever.
Remove the (usually black) shield, trim it down to the size of your other lens shields and assemble it again.

Does the Promaster 28-70mm 2.8-4.2 lens have an A-setting? Manual focus lenses that offer an A-setting, but not a constant aperture for all focal lengths might have slight exposure issues (or at least show the wrong aperture in exif) because they can't communicate to the camera whether they are at f2.8 (@28mm) or at f4.2 (@70mm) (using your lens properties as an example).
07-15-2021, 01:01 AM   #12
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QuoteOriginally posted by Joe Schmoo Quote
Couple?
I think, in this instance, 'Couple' means 'Mount' - i.e. the camera female mount will not accept the lens male mount.

IOW, it don't fit.
07-15-2021, 03:55 AM   #13
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perhaps a shot of the lens mount itself would help?
07-15-2021, 08:56 AM - 1 Like   #14
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QuoteOriginally posted by CountryGirl Quote
What I mean is, I can't get it to couple.
As has been already noted, that lens (if it worked on your Super Program) should work on the K-3. The only reason for it not to mount correctly would be the possibility of an over large aperture shield. That is not common but it does happen on some third party lenses, mostly Sigma in my experience. Actually that should be Vivitar, not Sigma my error. Other thoughts would that the lens has been damaged in some way or that the Promaster is not actually the Pentax version since Promaster would have lenses for other mounts as well.

There are many here that have experience with older lenses and mounts so posting a good picture of the lens mount would help.

Last edited by jatrax; 07-18-2021 at 11:48 AM.
07-15-2021, 08:59 AM   #15
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QuoteOriginally posted by 35mmfilmfan Quote
I think, in this instance, 'Couple' means 'Mount' - i.e. the camera female mount will not accept the lens male mount.

IOW, it don't fit.
My, my. I blush!
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