Sandy Harris escribió: > There's a 20 mm F2.5 that looks tempting for use in a > K10D-on-a-budget system: > > http://www.rugift.com/photocameras/mir_47_k_lens.htm > > Anyone have experience with that one? Alternatives? >
I had one of those, but used it only on film cameras. It is a well made, heavy and big lens. It doesn't have a front filter thread (the front side of the lens is about 82 mm. wide, if I recall correctly), and it comes with four small filters which are screwed at the back side of the lens. It needs to have one of those filters in place as it is part of the optical formula. It is multicoated, and, although it isn't as flare resistant as a Pentax SMC lens, it is better than the third party wide angle lenses I have used (Tokina or Sigma). In some film cameras, the filters I have mentioned in the first paragraph interfere with the mirror swing, but I think it isn't an issue with the APS-C DSLRs because they have a smaller mirror, but I don't know for sure because I haven't used the lens on a DSLR. It is a fast lens, but it isn't particularly sharp until f:5.6. It shows noticeable CA on film on the extreme borders of the frame. Some Russian and Ukrainian sellers sell that lens for about 100 US dollars on Ebay (I paid 90 dollars plus 10 dollars shipping expenses 5 or 6 years ago). Carlos -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
