Archived posting to the Leica Users Group, 2003/03/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I think the 1Ds holds the current full frame record for commercially available digital products, having apparantly beat out the Contax. but it still hasn't reached the resolution of slow slide film. Also, digitals still have problems with how they handle differences in light intensity within a given picture as well as colour balance issues. Of course they are working on it! With my old DCS-5c the problems are obvious. Even with extensive tweaking on PS I can't balance all of the coulors properly at the same time and image quality degrades with every correction. Javier - --- Austin Franklin <darkroom@ix.netcom.com> wrote: > Hi Robert, > > > From my experience, the digital seems to be even > more critical of lens > > performance. My guess would be better lenses > create smaller circles of > > confusion and hit the pixels in the sensors more > directly, rather than a > > wider circle and hit more pixels, that then have > to be interpolated. > > Not really. The MTF of any of any decent lense is > well above that of the > digital sensors used in the high end 35mm-esque > digital cameras. Take the > Kodak 14N. It has a full frame sensor of 4560 x > 3048, which is 4560 over a > 36mm span, or a sensor element size of 7.9u > (microns) square (36/4560). > > That would be an MTF of around 63 lp/mm (1000 times > 1/7.9 divided by 2, the > 2 is for line pair), well below what most lenses are > capable of, though > typically better than you can do handheld. You'll > get between that and half > that in reality because of how sampling works, so > max is 63, and worst is 32 > lp/mm, and that doesn't take into account any > effects of the Bayer pattern > sensor and it's processing that is required. > > Now, decent films have an MTF up around 120 lp/mm, > so film still have the > resolution edge on the highest end 35mm-esque > digital SLR at this point in > time, and realistically, I'm not sure the resolution > of these digicams is > going to get much higher very soon, nor does it > really need to for most > applications. > > Point is, digital isn't really any more sensitive to > good lenses than film > is, in fact, it really is less sensitive. But, you > will notice the > difference, certainly, between mediocre lenses and > good lenses with any D-60 > or above resolution digicam. > > Regards, > > Austin > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html