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Author Topic: 5D III w/100 MACRO - Background "Specs"  (Read 2459 times)

tbh1930

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5D III w/100 MACRO - Background "Specs"
« on: August 14, 2012, 07:17:54 PM »
Looking for some help.....this is a crop of a photo taken that has specs showing up on the black background.

5D III w/100 Macro
Tv 3.2
Av 32
ISO 3200

Any commnets or help will be appreciated.



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5D III w/100 MACRO - Background "Specs"
« on: August 14, 2012, 07:17:54 PM »

Drizzt321

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Re: 5D III w/100 MACRO - Background "Specs"
« Reply #1 on: August 14, 2012, 07:20:58 PM »
Why are you at ISO3200 and f/32? I'd guess f/12-16 would work just as well, and you could easily go down to a lower ISO, and possibly faster shutter speed as well.  *Note, I'm not a product photographer, so I don't know if that is normal

That being said...maybe a few specs of dust in the air that reflect the light just right onto a sensor that has it's ISO bumped up pretty far? Maybe some dust on or in the lens/sensor?
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tbh1930

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Re: 5D III w/100 MACRO - Background "Specs"
« Reply #2 on: August 14, 2012, 07:42:33 PM »
Purely experimenting with a whole range of camera settings in natural light. Looking at image quality out on the "edge" and ran into these specs showing up on the black background. They range in color and brightness when observed at 100%.

Just wondering if there is something to be concerned about with the sensor.

Example below:

Drizzt321

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Re: 5D III w/100 MACRO - Background "Specs"
« Reply #3 on: August 14, 2012, 08:11:33 PM »
Interesting...

Not being an expert, could it have something to do with diffraction and/or chromatic aberration at such small apertures? Have you tried taking a shot like that against a white or gray background and seeing if the same locations have spots like that? Or a long exposure with the lens cap on?

EDIT: Where's Neuro when you need him :P
5D mark 2, 5D mark 3, EF 17-40mm f/4L,  EF 24-105mm f/4L IS USM, EF 135mm f/2L, EF 85mm f/1.8
Film Cameras: Mamiya RB67, RB-50, RB-180-C, RB-90-C, RB-50, Perkeo I folder, Mamiya Six Folder (Pre-WWII model)
http://www.aaronbaff.com

neuroanatomist

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Re: 5D III w/100 MACRO - Background "Specs"
« Reply #4 on: August 24, 2012, 09:02:56 AM »
They look like hot/stuck pixels.  The manual cleaning step described above is supposed to remap the hot pixels.
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PixelReaper

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Re: 5D III w/100 MACRO - Background "Specs"
« Reply #5 on: August 24, 2012, 09:31:01 AM »
They look like hot/stuck pixels.  The manual cleaning step described above is supposed to remap the hot pixels.

+1

definitely look like hot pixels.  My 5D II has 15-20 of these.  if you use LR or DXO t=you will not notice them in the output files
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Re: 5D III w/100 MACRO - Background "Specs"
« Reply #5 on: August 24, 2012, 09:31:01 AM »