Thanks, Ann. I think I know what you mean wrt cross polarization - but
this is just a straight macro photo. The bismuth just has a colorful
iridescent sheen. Thanks for looking!
Mark
On 12/15/2015 11:44 AM, ann sanfedele wrote:
This looks like photos taken through a microscope of a thin section of
rock using "crossed Nichols"
Is the technique you used similar? I spy bi-refringence - or the
appearance of same...
Aren't rocks beautiful?
ann
On 12/15/2015 11:33 AM, Mark C wrote:
Continuing experiments with minerals - this is a 4x lifesized close
up of a bismuth crystal:
http://www.markcassino.com/b2evolution/index.php/bismuth-crystal
or
https://www.flickr.com/photos/markcassino/23671905071/
K01 with reverse mounted SMC K 24 f3.5, 70 stacked images. I could
not position a flash well to shoot into the crystal (it is very 3
dimensional) so I used ambient light which resulted in a shutter
speed of 0.4 seconds per shot. I would prefer to use the flash to
counter any vibration related blur, but the long exposures came out OK.
Comments welcome.
Mark
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