 Tonya Cozart |
lenses...digital and film confusion I am looking at buying a new lens, this is the description: Nikon AF Nikkor 50MM 1.8 I have a nikon d50, the specs on this lens say it is for film or digital, but it is a used lens from a private seller, so can I trust that he is right? I am new to this and not sure, but I don't want to buy a lens that won't work properly with my camera....any help would be appreciated.
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Scott H. |
I have both, the D50 and the AF 50mm 1.8. Works great, is very sharp, and will focus very quickly. Just make sure it is autofocus (it should read AF on the lens).
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robert G. Fately |
Yes, Tonya, the 50MM lens will work just find on your D50. Here's where some of the confusion about all this "digital lens" stuff comes from: 1) first, because the CCD in the D50 is physically smaller than the 24x36MM rectangle that is a full-frame 35MM film image area, there is what's called the "crop factor". In the case of the Nikon DSLRs, this factor is 1.5, and essentially you multiply that factor by the focal length of a given lens to see how it would "behave" on the DSLR. In other words, the 50MM lens on the D50 would more-or-less be equivalent to a 75MM lens on a film SLR, in terms of field of view. Likewise, a 200MM lens acts like a 300MM when placed on a DSLR (whoopee!) but a 20MM wide angle lens acts like a 30MM (boring!). Anyway, the 50MM Nikkor is fine for your camera. Nikon (and Sigma etc) also make some lenses specifically for the DSLRs; Nikon calls theirs the DX line of lenses. These are designed to project light across the full CCD chip, but if used on a film camera they may lead to serious vignetting - light falloff towards the edges of the film. Nothing fatal, but you don't get the full image area is all. 2) the other "digital-ness" of lenses has to do with whether their rear elements are multicoated to prevent flare. In the old days this was never done, since the back of the lens was inside the camera body and film isn't all that reflective. But chips, it turns out, are quite reflective, so some lenses which work fine on film cameras have ghosting or flare issues on DSLRs. However, the 50MM and longer lenses are not part of this group, so you should have no problems. Hope that helps.
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Tonya Cozart |
Thanks so much for the info, esp the details! That helps allot! much appreciated!
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