Focal lengh is not the issue. Angle of view is. Focal lenght does not change between formats. It is a fixed property of the lens. What Pentax and others do however to differentiate between a lenses performance on digital (*ist) and 35mm cameras is refer to angle of view.
Linky: http://www.dpreview.com/news/0408/04080801pentax_lenses.asp Angle of view 100mm 2.8 - 24.5 degrees (16 degrees with the *ist D body) 50mmm 2.8 - 47 degrees (31.5 degrees with the *ist D body) Antonio On 14/8/04 11:51 pm, "Alexandru-Cristian Sarbu" <[EMAIL PROTECTED]> wrote: > if Pentax choosed to write some fictional, "equivalent" numbers instead > of the true focal lenght on their DA lenses, I wonder how could they explain > what's the differente between the DA "24-70" ("equivalent blah blah") and a > FA 24-70 full frame lens... can you? <grin>
