Ryan Brooks wrote: > Godfrey DiGiorgi wrote: > >>On Aug 27, 2006, at 12:17 PM, Ryan Brooks wrote: >> >> >> >>>>The only complaints about crop factors and telephoto's I've run acros >>>>are about 85's. Not many people are happy that their uber-pricey >>>>portrait tele's are now too long for general use and the 50's >>>>don't have >>>>the bokeh of those 85's. The biggest complainers seem to be the Canon >>>>users (but Canon 85 f1.2L's are ridiculously expensive). >>>> >>>> >>> >>>My complaint is about normal lengths, ala 50mm. A 31mm perspective is >>>fine, but the 31mm focal length doesn't look "normal" at all to me. >>> >> >>I'm not sure what you're saying, Ryan. If you're using a 16x24mm >>sensor and fit a 35mm lens, you get the same field of view as you do >>with a 50mm lens fitted on a 24x36mm film body. That implies the same >>perspectives as well, since perspective is a function of distance. A >>31mm lens is a little wider than that film 'normal' but is still >>within the range of normal. >> >>What about the 31mm focal length doesn't look "normal" to you on your >>*ist D? >> > > 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. > > > -R > >
But 50mm on film is just a crop of a WA as well (since a 50mm is a wide on all larger formats), that's how different formats determine different fields of view. Perspective is entirely a function of differnce, but the 31 is closer to a true normal on DX format digital than 50mm is on 35mm film (50mm is actually a telephoto lens, 43mm is of course the true normal. DX normal is 29mm after rounding to the nearest whole mm). -Adam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
