Like to see a larger image but it seems to work quite well. Powell
> >For a subject to test the 50/2.8 EX Sigma Macro >with a Soligor Auto Macro Converter I went >downstairs and collected one of my wife's >Christmas baskets of little plants. But one thing >led to another and I ended up taking a through >focus series at f2.8. The reasoning being that if >there were problems they'd be more likely to crop >up at wide open than anywhere else. The flash was >a Vivitar 730AF which seems to work pretty well >with the *ist D. > >Well the results were not too dusty see: > >http://www.kolumbus.fi/mimosa/HOLD/161606.jpg > >Please don't take composition or other aesthetic >matters into consideration just see if there are >any faults I've overlooked. I think one of my >steps might have been a little too wide because >one bud, top right, seems a little out of focus. I >used Helicon Focus for this and not the usual >CombZ, which I prefer for high magnification >microscope images. I stacked the RAW files, >converted the result into TIFF and adjusted >contrast in Photoshop. No sharpening was done and >none is set in the camera. I had the *ist D set to >green for this experiment and used the 2 second >delay and a remote release cable. > >Don > >E.R.N. Reed wrote: >> 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. >>> >>> Powell >>> >>> >>> >>> >>> >> Sigma lenses sometimes do that on Pentax cameras. >> >> >> > >-- >Dr E D F Williams >_______________________________ >http://personal.inet.fi/cool/don.williams >http://www.kolumbus.fi/mimosa/index.htm >See feature: The Cement Company from Hell >Updated: Print Gallery -- 16 11 2005 >
