Yes it does have a filter like element on the mount side. I can't remove it manually. Tried a UV filter today and my impression is sharpness has improved, almost razor sharp. Focusing is very difficult. It pops in and out of focus maybe I need a Katz screen.
Toine On 11 April 2010 04:36, Graydon <gray...@marost.ca> wrote: > On Sat, Apr 10, 2010 at 04:11:27PM +0200, Toine scripsit: >> 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. > > Even when you unscrew the kmount part? I've wound up with a bizarre > collection of 30.5mm filters, and interesting scars from figuring out > how to screw the filter into a place that assumes either specialized > tools or very thin fingers. > >> 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. > > Quite possible. I've certainly never seen the lens you've got, so I'm > speaking in generalities. > > -- 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.
