Re: digital lens on film cameras


"Thomas T. Veldhouse" <veldy71@xxxxxxxxx> wrote in message
news:43451a7e$0$273$8046368a@xxxxxxxxxxxxxxxxxxxxxxxxx
> Jasen <jasen_anderson@xxxxxxxxxxxxxx> wrote:
> > Just curious, but can you use a wide angle digital lens on a 35mm film
> > camera, say 18-200mm zoom? If not, why not?
>
> The DX (digital) lenses (you didn't specify Nikon or not) are designed
> for an APS-C sized sensor. To avoid bulk and complexity, they take
> advantage of the smaller sensor target so that they can make a smaller
> and lighter and cheaper lens. If you try to take one of these lenses
> and put it on a 35mm film camera, you will get a circle on the film
> optimally at an APS-C size and then have fall-off outside of that
> circle. The degree that this occurrs will vary lens by lens, but it is
> universal. Reportedly, there are some lenses that the falloff is so
> slight that they can be effectively used at some focal lengths (i.e. the
> Nikon AF-S DX 12-24mm).
>
> Consider an analogy. You have a slide projector aimed at a white
> screen. You adjust so that it fills the screen perfectly. Now,
> somebody swaps the screen for a larger screen. No, only the center of
> that screen has coverage. This is what happens when you swap an APS-C
> sized sensor for 35mm film.
>
> --
> Thomas T. Veldhouse
> Key Fingerprint: 2DB9 813F F510 82C2 E1AE 34D0 D69D 1EDC D5EC AED1
> Spammers please contact me at renegade@xxxxxxxxxx

Ah, thanks for that. I am thinking of the KM Dynax (Maxxum) 7D actually,
which has the APS-C size. I had a feeling this might be the case.
I'm really wondering whether I'm better to get a nice broad zoom, say 18
through to 200 or just a low end wide, say 17-35 or up to even 50mm for this
camera. I already have lenses for my film camera starting at a fixed 24mm
and going through two zooms (35-70 and 70-210) and up to a fixed 400mm
Tokina SD lens
How do film camera lenses rate on digitals at the medium to longer focal
lengths? Do you reckon I should get the 18-125mm digital Sigma lens???
Choices, choices!!!!
cheers
Jasen


.

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