On 21 Oct 2005 at 16:13, [EMAIL PROTECTED] wrote: > So, in that case I would need new lenses anyway because my small format lenses > will not be very good on full frame. I've even discovered some purple fringing > on my 135 1.8 at small apertures (luckily I usually dont stop down much).
Try it wide open for some more psychedelic effects, I sold mine because it didn't come up to standard. I would sell my A20/2.8 too but unfortunately Pentax have been too slack to provide a modern update for it. > Anyway. I don't know which parametres you have tested, but resolution is not > necessarily the most important issue for a sensor. Anything below the size of > the "bayer pixel" is unecessary for the lens, and you may even have some > advantages in some noise issues and moire if the "bayer sensors" are smaller > than the lens resolution. I'd prefer lenses with less PF, CA, distortion and > vignetting. Fringing is the worst problem for me now, my lenses are all providing better performance than they ever did on film because I can now effectively digitally counter CA, distortion and vignetting. There are of course advantages and disadvantages in using larger pixel sites, one would hope that SNR would be better and it may be but likely at the expense of sensitivity. I think at the moment the best compromise performance vs price vs weight/bulk wise is with full frame 25mm sensors and lens combinations. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
