>What was your thinking behind using the converter? >More working distance?
More working distance and twice the magnification possible. Just giving it a try to see how it would work and it works very well except for the incorrect f stop numbers. > This is a superb lens and >I've said so on several occasions, but there has >been no response. I agree. The Sigma 50mm EX Macro is a very sharp lens that looks good and works very nicely. >I presumed this was because >there are not many of us using them. The Pentax >100mm seems to be far more popular although not as >good overall -- according to the tests I've seen. > >Don > > > >Powell Hargrave wrote: >> http://members.shaw.ca/hargravep/Image10.htm >> Sigma 50mm EX Macro plus the Pentax Rear Converter-A 2X-S. >> Comments, critique encouraged. >> >> The f stop reported to the camera is wrong with this combo. Wide open it >> tells me the 2.8 lens is a 1.4 and of course the combination is really 5.6. >> The exposure is fine and when set to A the camera adjusts the diaphragm >> properly. Just the numbers are wrong. Anyone know if this can be fixed? >> Bit of an annoyance but not a real problem.
