All autofocus camers recomend against linear polarizers. Linear polarizers work just fine on my leaf as well as arri sony and red digital cinema cameras. Have you guys tried using different color spaces? sRGB is crap and abobe rgb isnt all that. Much better but has a lot more gamut then srgb. I dont know why 35mm limits to those 2 profiles. Leaf and phase one camera rgb are bigger gamut then even prophoto rgb. Im going to go out on a limb and say either in camera debayer jpg or abobe light room raw conversation. If there is a item not bugish that i can shoot with my leaf to see if its a simple camera gamut issue I can take a stab.
On May 5, 2014 10:35 PM, "karl shah-jenner" <shahjen@xxxxxxxxxxxx> wrote:
----- Original Message ----- From: "Don Roberts" <don.roberts@xxxxxxxxxxxxxxx>
To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxx>
Sent: Monday, May 05, 2014 8:10 PM
Subject: Re: sheen and iridiscence?
That was what I had asked, Karl. Is the loss of the iridescent effect due to digital capture? Andy and I seem to have encountered the same problem and believe it is. Film always captured it.
Don
On 5/5/14, 1:26 AM, karl shah-jenner wrote:
Don Roberts
"This bug was one of the most highly iridescent I have seen. That has always shown up well on film before. This time digital did not capture it. Is this characteristic of digital capture"
my answer - maybe, it depends on the bug
after all, some colours we see on insects (and birds feathers) are not actually 'colours' but a perception of colour eminating from refraction, interference or diffraction rather than pigment
see here for more info:
http://onlinelibrary.wiley.com/doi/10.1002/jmor.1052020106/abstract
me:
I have experience with diffraction causing colour renderings to go askew in digital imaging where the sensors are more rigidly structured than random grains in film, occasionally it can be overcome by changing the distance at which the subject is photographed.
here's one tiny jumping spider I had issues with (digital) - the metalic metallic iridescence rendered dull, the brilliant blue colour failed to render at all
https://www.flickr.com/photos/smileyferret/149709068/
this mole cricket similarly came out dulled down, the water repelant sheen was visible on film, not on digital
https://www.flickr.com/photos/smileyferret/149709653/sizes/o/in/photostream/
the photos were opportunistic, snapped when I encountered the things on holiday - and this 2 inch wasp was busy hunting crickets underground when I disturbed it so it was a tad angry with me when it emerged - hence the blurry image - I got a number of images but this was the only one showing the metallic colours reasonably well
https://www.flickr.com/photos/smileyferret/149709114/
again I could only conclude that digital sensors don't cope well with refraction, interference or diffraction (one possible reason many cameras advise against linear polarizers?) seeing the mole cricket rendered OK on film and not on dgital, the wasp colours OK-ish when the wasp moved and blurred but not when still, I would have to assume the sensors were the issue
k
