>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.
>Sigma lenses sometimes do that on Pentax cameras. Works correctly without the 2x converter. If the error was in the other direction it would actually be the correct f stop. :) Powell
