Hi again,
Okay ... there's a bigger file in the same place.
http://www.kolumbus.fi/mimosa/HOLD/161606a.jpg
I've also put a bigger TIFF version in my
Science.info.org
directory. If you think you'd have the time to
download it
(4mb) let me know and I'll give you the URL.
Don
Powell Hargrave wrote:
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
--
Dr E D F Williams
__________________________________
http://www.kolumbus.fi/mimosa/index.htm
http://personal.inet.fi/cool/don.williams
See feature: The Cement Company from Hell
Updated: Added Print Gallery - 16 11 2005
