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05-20-2010, 12:35 PM   #1
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Lens conversion from Minolta to Pentax?

I have a Vivitar 70-210 manual focus lens for an old Minolta X-700 film camera. Is it possible to have the mount converted so that it mounts on my K200d?

05-20-2010, 01:14 PM   #2
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You might be able to convert the lens to m42 screw (don't know) and get m42 adapter for the camera (do know).

But it might not be worth it. Vivitar can be iffy as to quality
05-20-2010, 01:30 PM   #3
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05-20-2010, 08:23 PM   #4
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There's a detailed article on how to convert a Viv S1 70-210 here:

He converted a Konica mount which has a 5mm shorter registration distance. The Minolta is 1.74mm shorter.

Good luck!

05-20-2010, 09:45 PM   #5
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The first thing I'd do is find out how much a Pentax mount version of the same lens costs. If it isn't a Series 1 lens and one of the first three versions, a K-mount version is going to be really cheap on eBay. Here's a link to a site explaining the Series 1 versions:

Vivitar 70-210 Series 1 Macro Zoom Lenses - Mark Roberts Photography

With some effort, you could get it to mount and work. You have three big obstacles:
  • The Minolta mount has a shorter registration distance than Pentax, therefore a simple mount replacement will create a lens that won't focus to infinity. There might be an adjustment for that, or you might need to machine the lens to make up the distance.
  • The lens is pretty heavy so any mount solution is going to have to be rock-solid. You might end up drilling and tapping screwholes. Epoxy probably won't last.
  • Minolta aperture rings turn the opposite direction of Pentax. You will probably have to give up on an aperture lever. That means focusing wide open, then stopping down with the aperture ring to shoot at your desired aperture.
It's difficult to sell a converted lens too. For a somewhat common zoom that you can probably find for less than $100, I don't think it's worth it.
05-21-2010, 12:14 PM   #6
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Thanks for the info guys. It sounds like it's not worth the effort. By the way how are Promaster lenses? A local camera shop has a few.
05-21-2010, 12:48 PM   #7

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QuoteOriginally posted by iClick Quote
By the way how are Promaster lenses?
Promaster doesn't make lenses (or anything for that matter). The lenses are made by different manufacturers and rebadged so it's difficult to generalize.

I had a few Promaster lenses made by Sigma. IQ wise, they are mid-range, not the worst nor the best.

IMO, it's better to stick with brand names: Sigma, Tokina, Tamron, and of course Pentax.

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