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07-22-2010, 06:18 PM   #1
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retro-fitting new lenses to old cameras

Has anybody ever used something like a PENTAX DA 18-55mm f/3.5-5.6 AL on film slr? Specificly, a ZX-50. Things like-would it actually be an 18mm to 55mm or would there be a ratio thing going on like with using older lenses on newer dslrs.

07-22-2010, 06:41 PM   #2
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QuoteOriginally posted by jonhock Quote
Has anybody ever used something like a PENTAX DA 18-55mm f/3.5-5.6 AL on film slr? Specificly, a ZX-50. Things like-would it actually be an 18mm to 55mm or would there be a ratio thing going on like with using older lenses on newer dslrs.
an 18-55mm lens is always an 18-55mm lens

what changes is that due to the larger fiml area, the field of view of the lens is wider and some DA lenses may not cover the entire 35mm frame

there is a thread listing the performance of DA lenses on film cameras in the lens forum

as a simple example however, I have used my sigma 10-20 mm lens which is DC rated (I.e. for ASP-C sensors only) on my PZ-1 and it shoots just fine, but vignettes below 13mm.

still on film, 13mm is awfully wide
07-22-2010, 07:09 PM   #3
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The 18-55 (1) vignettes in an MX's viewfinder at below 24mm or so. Haven't tried it for film pics, though. I do love the DA40 on a super program and *ist.
07-22-2010, 07:21 PM   #4
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there is a ratio thing

Stuck a DA 16-45 on the old Super A for laughs. It acts as 16 mm (of course - can't help with techo explanation) on FF which is super wide, and vignets of course but shutter fires fine.

07-23-2010, 06:19 AM   #5
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I use my 16-45 on film all the time. Wider than about 21-22mm it vignettes, but I like that. Actually I bought the lens a year before I bought a K100D. You get a nice wide angle zoom.
08-02-2010, 02:11 PM   #6
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Thanks, Thanks, Thanks, and....oh, Thanks!

That's cool! The way you all are explaining it is how I'd hoped it would be. These
facts open up quite a few options in my lens buying specs and would allow me to get used to the lenses until I get the K-x I've been day-dreaming (and saving for) about!
Now, what about a DA lens on my Spotmatic F?
08-02-2010, 08:19 PM   #7
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Good luck jamming that big K-mount into the 42mm opening.
08-12-2010, 07:02 PM   #8
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K-x was the dream, A new (to me) K10D is the reality!
I had to do an awful lot of filing to get that DA mounted on my Spotty......

08-13-2010, 04:51 PM   #9
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QuoteOriginally posted by jonhock Quote
K-x was the dream, A new (to me) K10D is the reality!
I had to do an awful lot of filing to get that DA mounted on my Spotty......
It's your own fault for not using the right tools for the job. When you have that much metal to remove you should start with a hammer and chisel. Use the files for final finishing.
08-13-2010, 05:44 PM   #10
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Oh, Darn!

08-13-2010, 06:13 PM   #11
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Yea you can use the 18-55 safely up to about 24mm or something like that.

Nice to keep those Super and after series bodies around just for film.
08-13-2010, 09:19 PM   #12
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Okay

Okay, now ya'll are makin fun of me....
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