Larry, First of all, 20/1.8 with x1.4 will be close to f/2.5 if I am doing the math right at this ungodly early hour.
SEcond, while I don't have experience with Tamrox TCs, I have been happily using Pentax's MF 2x-S and "AF" x1.7. I just wanted to remind that the TCs can also be used with a macro lens, making it "super-macro". Here is what DAF 100-MACRO with 2x-s and AF-1.7 stacked together can do with a raspberry: http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9609.jpg http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9608.jpg Igor On 29 August 2010 00:47, Larry Colen <lrc at red4est.com> wrote: > I probably got it when I bought someones bag of gear, saw that it was > a TC and just tossed it in the drawer without looking at it. > > I just tried it out and it seems to work fine on autofocus. Does > anyone have any experience with one of these? Would it degrade an > image less than cropping it by a factor of 1.4? > > Another cool realization I had was that my Sigma 20/1.8 will work just > fine on a K1000 body that I've got lying around, and it'll give me a > view that is wider, and faster, than my 16-50 on the digital body. > Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 > on the sensor. > > In any case, it should be fun to play with. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
