I have no experience with AF teleconverters, but have the MF Adaptall 2 version of both the 2x and 1.4x that I planned to use with my 52B 90mm f2.5 Macro SP. It will do 1:2 by itself and 1:1 with the 2x, so I believe that means it will do 1:1.5 with the 1.4x.
The main advantage of the 1.4x (to me) is that you are losing only a stop of light instead of 2 stops with a 2x. Nice to have when that is a factor. The Sigma EX 10-20mm f4-5.6 will also cover a full 35mm frame, at least down to about 13mm. That probably makes it about the widest rectilinear you can put on a film camera. Need to carve out some time to actually USE all the stuff I've been accumulating. Your 1.4x to 2x image degradation comparison would be interesting to do. Darren Addy Kearney, NE On Sat, Aug 28, 2010 at 11:47 PM, Larry Colen <l...@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. > > -- > Larry Colen l...@red4est.com sent from i4est > > > > > > -- > 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. > -- Nothing is sure, except Death and Pentaxes. -- 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.
