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Why Are His Whiskers Multicolored?
Jan 28, 2017 16:06:05   #
busmaster2 Loc: College Point NY
 
I took this shot with a russian 65mm medium format lens on my sony a7ii using a sony flash. I was wondering if the multicolored whiskers are a result of a lens defect or whether the sensor being unable to resolve the fine details. The shot appears to be very sharp in any case and no sharpening was used in processing.


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Jan 28, 2017 16:27:27   #
Rongnongno Loc: FL
 
busmaster2 wrote:
I took this shot with a russian 65mm medium format lens on my sony a7ii using a sony flash. I was wondering if the multicolored whiskers are a result of a lens defect or whether the sensor being unable to resolve the fine details. The shot appears to be very sharp in any case and no sharpening was used in processing.

If you see only whiskers you need glasses.

There are other problems with color noise (marble patterns*)...

Shoot a lens calibration to see what going on.

Quote:

* Possibly due to JPG compression.

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Jan 28, 2017 16:35:16   #
oldtigger Loc: Roanoke Virginia-USA
 
typical russian lens:
chromatic aberration, the whiskers just happened to be in the same plane as your sensor.
next time shoot more from the front of the face on animals with whiskers..

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Jan 28, 2017 16:35:52   #
busmaster2 Loc: College Point NY
 
The shot was underexposed to begin with, but the coloration of the whiskers in particular was present in the uncompressed shot as well. But as a question: If a particular lens had more resolution than the sensor couldn't this happen as well? Further, is this a be a representation of moire? The a7ii has a moire filter.

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Jan 28, 2017 17:01:41   #
oldtigger Loc: Roanoke Virginia-USA
 
busmaster2 wrote:
... I was wondering if the multicolored whiskers are a result of a lens defect ....

don't confuse it with this example of moire.
cropped image of display screen (nikon 105/2.8)


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Jan 28, 2017 17:04:55   #
Rongnongno Loc: FL
 
oldtigger wrote:
don't confuse it with this example of moire.
cropped image of display screen (nikon 105/2.8)

There is a fly dropping on your lizard....

(j/k)

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Jan 28, 2017 20:44:33   #
Ken Harris Loc: Nashville,Tn.
 
I have the same issue on a photo of my cat, shot with a Sony A7II (Sony 90mm f2.8 Macro) in natural light. I assumed it was chromatic aberration, but was only partially successful in removing it in post processing. Enough of it remains to bug me!


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Jan 28, 2017 20:51:29   #
oldtigger Loc: Roanoke Virginia-USA
 
Ken Harris wrote:
... Enough of it remains to bug me!

your whiskers are also in the same plane as the sensor but your focus is closer
to the eye and most of them are not at that critical distance.

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Jan 28, 2017 21:00:56   #
rehess Loc: South Bend, Indiana, USA
 
If you look in the rectangles I've drawn you'll see funky green areas and red areas.

I have a black cat, but I've never seen anything like this, neither the whiskers nor the funky areas.

I see that this picture was taken at an ISO setting of 3200, which seems way too high to me - with flash you should be down around ISO = 100.


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Jan 28, 2017 21:16:18   #
oldtigger Loc: Roanoke Virginia-USA
 
the red splotches in fur also show in the shaded areas way over on the left of image.
That is a different problem than the whiskers, my guess is high ISO/noise and PP for the red.

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Jan 29, 2017 13:59:58   #
jeep_daddy Loc: Prescott AZ
 
oldtigger wrote:
typical russian lens:
chromatic aberration, the whiskers just happened to be in the same plane as your sensor.
next time shoot more from the front of the face on animals with whiskers..


chromatic aberration

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Jan 30, 2017 14:08:29   #
speters Loc: Grangeville/Idaho
 
busmaster2 wrote:
I took this shot with a russian 65mm medium format lens on my sony a7ii using a sony flash. I was wondering if the multicolored whiskers are a result of a lens defect or whether the sensor being unable to resolve the fine details. The shot appears to be very sharp in any case and no sharpening was used in processing.

Did'nt you know, Russians are seeing colors different? No, I suspect it is reflected light that's perhaps bounced back from the dark coat and shows some diffraction in the whiskers (like you sometimes see in reflections in windows or water), similar to rain bows.

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