I was just thinking that the differences in resolution, active image circle, and sensitivity to incidence angle of FF film vs. 6MP APS digital might make signifigant differences in which lenses to buy/sell. Two lenses different on film might be same on 6MP-APS-D or two lenses same on film might be different on digital or one lens that's better on film compared to another might actually be worse on digital compared to that same other lens, etc.
For example a high end wide angle model "a" might be clearly better than model "b" on FF film due to superior corner sharpness. But if this superior corner sharpness region is entirely out of the area covered by the APS sensor, then lens "b" might be virtually identical to "a" on 6MP-APS-D. And so on... JCO -----Original Message----- From: Rob Studdert [mailto:[EMAIL PROTECTED] Sent: Friday, January 06, 2006 7:02 PM To: [email protected] Subject: Re: Pentax lens test on DIGITAL? All Pentax DSLR same imagaing? On 6 Jan 2006 at 10:45, J. C. O'Connell wrote: > Anybody know of a website(page) yet that > tests the performance of ALL Pentax Lenses on > Pentax DSLRS ( K and or M42). Since most > of these lenses were designed for film > rather than digital it would be very nice > to have some specific data on the APS digital > performance of them, comparisons, etc. There are plenty of site that compare some lenses side by side but none that compare even a fraction in a similar manner. What would you expect to be revealed in such tests? I've tested a lot of my lenses but mainly to determine optimum apertures for the long lens/TC combos and for wide angles to determine distortion correction factors. 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
