Den 28. aug. 2006 kl. 03.11 skrev Ryan K. Brooks: > On Sun, 27 Aug 2006, Godfrey DiGiorgi wrote: > >> On Aug 27, 2006, at 1:30 PM, Ryan Brooks wrote: >> >>> It appears to be a crop of a wide angle lens, which it is. >>> >>> In particular, informal head and shoulders shots look a bit odd >>> if I'm >>> close to the subject. The shoulder may seem enlarged if I'm >>> taking a >>> profile, for example. Whereas a 50mm would compress this distance >>> more. >>> >>> I thought I would be at home with the 31mm limited on the D, but >>> using a >>> wide angle lens to achieve a normal-length crop is a bit wonky to >>> me. I >>> still like it, I wish I was using a 50mm focal length instead of a >>> 31mm >>> lens cropped. >> >> ??? >> >> I don't know how you can tell the difference. The lenses' rendering >> qualities might be slightly different with respect to out of focus >> elements and rectilinear correction, but with regard to field of view >> and perspective: if the field of view is the same, the perspective >> will look the same. > > The field of view is the same, but that doesn't say anything about the > transform taking place optically. The image from 50mm crop of a > ~31mm > lens != 50mm > full frame. Try it. You can really see it when you're framing, > and it > makes for weird magnification of things close to the lens. > > I'm not talking about bokeh or anything esoteric. Try it. Cropped > focal length isn't the same as focal length. Not interested in a > debate,
Time for a reality check? If this was true compact digital cameras would be hopeless. Just image the perspective you get with a 6 or 7mm lens on full frame. Or the other way around: Why do you get wide angle perspective with a 40mm and 6x6cm film, like this: http://foto.no/cgi-bin/bildekritikk/vis_bilde.cgi?id=209653 ? DagT http://dag.foto.no Beware of internet links. You never know what is on the other side. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
