Chris Stoddart wrote about the Mir 47-K 20 mm. 2.5: > 1. The filters go on the back, you get three supplied with it. I have had > differing reports as to whether one has to be fitted permanently (i.e. > part of the optical formula). One guy I have spoken to swears that the > factory technicians told him they do, however my mate down the corridor > at work has read the manual for me (he's Russian) and it apparently says > nothing about this. Also the optical diagram in the manual doesn't include > the filter. This is fairly crucial because
I can tell you my experience about this lens: I wrote a message to the list some months ago, then I said the filters where not necessary for infinite focus, and this is what it seems to me after some months using this lens. BUT, they are needed to correct some colour fringing at the edges of the image, or better said, if you don't use a filter, for example the clear UV one, you will see such colour fringing at the corners of the negatives or slides, this is gone when you fit the filters. So it seems that the filter is an important part in the optical dormula of the lens. Then, I can't use the lens in the "small" Pentaxes I have (MZ-S, MZ-5 and MX) because it interferes with the movement of the mirror when it swings back to its start position, as Chris said. It doesn't happen with my Z-1 or SFX bodies. ------------------------------------------------------------------ Carlos Royo [EMAIL PROTECTED] Zaragoza (Aragon) - Spain ------------------------------------------------------------------ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
