Thanks, I'll try that with a UV filter. I knew that some lens designs need a filter at the end of their optical path. This one doesn't have a filter thread at the end. The softness is only visible when the lens is fully extended at 2.5 meter focussing range. It has optical parts in the front and rear. The rear parts don't move during focussing. Most likely the contraption is optimized at infinity.
On 10 April 2010 15:38, Graydon <gray...@marost.ca> wrote: > On Sat, Apr 10, 2010 at 01:44:24PM +0200, Toine scripsit: >> Yep it arrived today. Maybe I'll try some stealthy street photography. >> It's a little soft for birds. > > It looks like it's missing its full-pass neutral density filter; many of > the catadioptric lenses seem to assume there will be a filter, so if you > (for some inexplicable reason) don't want to make things dimmer, you > need to stuff a full-pass piece of glass in there. Don't know if this > applies to the particular lens, but the picture sure looks like what my > Rokinon 800/8 did before I got a full-pass neutral density filter for > it. It's now quite sharp, if I manage to get the > focus-plane-like-a-microtome where I want it. > > -- Graydon > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
