On Nov 12, 2006, at 5:58 PM, Digital Image Studio wrote: > Which current Pentax lenses are designed to produce a more collimated > projection onto the sensor plane?
I would guess the DA14 and DA12-24 at least, hard to know for sure without looking at all the lens diagrams (and being more of an optical engineer than I am...). Look at the rear element groups in the DA14 on Boz site and compare them to the older 15/3.5 lens: they are similar in some ways, different in others. Unless I miss my guess that's where the collimating is happening. I know the DA14's vignette cutoff when imaged onto 24x36 film is pretty sharp at all apertures and doesn't grow much, which leads me to believe that it is one where sensor collimation has been addressed. The DA14 produces extremely even illumination across the image circle, even wide open, which also suggests special corrections. Godfrey -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
