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
