Canon EOS 7D Master thread

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Archive 2009 · Canon EOS 7D Master thread

Tom_W
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p.138 #1 · Canon EOS 7D Master thread

Zenon Char wrote:
It seems to be more noticeable with this unit. I just found out about PS Despeckle and applied it for the white specs. Still curious as to what causes it? Here is one after Despeckle. I have not red specs like this before.

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That's noise. You should be able to address that with some modest noise reduction, without blastiing detail..

Are you shooting RAW or JPG?

Oct 17, 2009 at 03:05 PM

Zenon Char
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p.138 #2 · Canon EOS 7D Master thread

RAW with NR Off. I use Dfine which does a good job. The red spots just seem to stand out more than usual.

Oct 17, 2009 at 03:22 PM

Zenon Char
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p.138 #3 · Canon EOS 7D Master thread

Had to leave for a moment to find this. I do not see this in this image. ISO 3200 - NR Off.

http://www.imaging-resource.com/PRODS/E7D/E7DhSLI03200_NR_OFF.HTM

Oct 17, 2009 at 03:25 PM

brainiac
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p.138 #4 · Canon EOS 7D Master thread

Zenon Char wrote:
Can someone tell me what these white and red specs are? ISO 3200 and the second is a 100% crop of underneath the SUV.

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It is a sign that you have all NR turned off and the camera is not interfering with your raw files, so they will be really crisp, and respond extremely well to simple noise reductions techniques, like Photoshop dust and scratches:

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Oct 17, 2009 at 03:34 PM

Zenon Char
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p.138 #5 · Canon EOS 7D Master thread

Thanks. That's pretty good. I appreciate the reply.

Oct 17, 2009 at 04:13 PM

mogur2
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p.138 #6 · Canon EOS 7D Master thread

Thanks for all the suggestions for setting focus on the 7D.
Below are a few shots taken with the 7D using the Sigma 50-500 zoom. Cropped to about 1/3 frame.

2012 © mogur2

Oct 17, 2009 at 04:42 PM

fotografur
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p.138 #7 · Canon EOS 7D Master thread

mogur2 wrote:
Thanks for all the suggestions for setting focus on the 7D.
Below are a few shots taken with the 7D using the Sigma 50-500 zoom. Cropped to about 1/3 frame.

Not to seem harsh but those look worse then what my G10 does. What iso where those at? The birds look like blotches.

d~

Oct 17, 2009 at 04:58 PM

mogur2
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p.138 #8 · Canon EOS 7D Master thread

Hi,
ISO @ 800, severe backlighting. Needed PS filllight to open.

Oct 17, 2009 at 05:13 PM

fotografur
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p.138 #9 · Canon EOS 7D Master thread

I see. That explains the blotchy birds.

thanks

d~

Oct 17, 2009 at 05:32 PM

abqnmusa
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p.138 #10 · Canon EOS 7D Master thread

You can clean up the white specs nicely with the photoshop filter "dust and scratches"

Oct 17, 2009 at 07:39 PM

Zenon Char
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p.138 #11 · Canon EOS 7D Master thread

Yes that worked well. What causes that?

Oct 17, 2009 at 07:40 PM

abqnmusa
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p.138 #12 · Canon EOS 7D Master thread

I have seen the white specs in other cameras at high ISO. Not unique to the 7D. You see it in underexposed area of high ISO images.

Photoshop Dust and Scratches cleans it up.

Thanks to Brainiac in a previous post. He demonstrated how well the Photoshop filter Dust and Scratches works.

Oct 17, 2009 at 07:42 PM

abqnmusa
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p.138 #13 · Canon EOS 7D Master thread

mogur2,

We get that seve lighing here in New Mexico. The contrast is just to harsh to record. I try to always keep the sun to my back when shooting in such light.
The puts the image back into the recordable range.

Oct 17, 2009 at 07:47 PM

ejmartin
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p.138 #14 · Canon EOS 7D Master thread

Zenon Char wrote:
Yes that worked well. What causes that?

Impulsive component to the read noise in RAW data. In other words, a few pixels that are outliers in the noise distribution. They are particular colors (like red) when it is a red pixel in the CFA that has the noise impulse -- the surrounding G and B pixels aren't as noisy, so you get color saturated noise spikes. White is more likely a spiky G pixel, due to the way demosaic works.

Oct 17, 2009 at 08:19 PM

JohnH500
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p.138 #15 · Canon EOS 7D Master thread

Hi There

Thought I would just add some shots taken with the 7D which I have had for around a week now, and I have to report I have been pretty impressed with it...

Its not a 1D MKIII killer.. but for the money its the closest you will get to 1 series performance without spending twice as much... and 18 million pixels gives you plenty of room to crop, and the high ISO performance is pretty good as well and all in a lightweight small package.

These shots were taken at the Hawk Conservancy Trust here in the UK this afternoon

John

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Oct 17, 2009 at 08:42 PM

RAF09
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p.138 #16 · Canon EOS 7D Master thread

Those are great shots. How much crop? And what lens? I've had really poor results with BIF and almost any cropping. Image turns soft w/fuzz almost immeditely. I've been using 500 and 300 no extender.

Oct 17, 2009 at 09:07 PM

dwweiche
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p.138 #17 · Canon EOS 7D Master thread

Love #3.

EF 500mm f4 IS?

Oct 17, 2009 at 09:31 PM

abqnmusa
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p.138 #18 · Canon EOS 7D Master thread

JohnH500,

nice hawk photos with the 7D

Oct 17, 2009 at 10:12 PM

Zenon Char
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p.138 #19 · Canon EOS 7D Master thread

ejmartin wrote:
Zenon Char wrote:
Yes that worked well. What causes that?

Impulsive component to the read noise in RAW data. In other words, a few pixels that are outliers in the noise distribution. They are particular colors (like red) when it is a red pixel in the CFA that has the noise impulse -- the surrounding G and B pixels aren't as noisy, so you get color saturated noise spikes. White is more likely a spiky G pixel, due to the way demosaic works.

Thanks for the detailed explanation.

Oct 17, 2009 at 10:33 PM

Zenon Char
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p.138 #20 · Canon EOS 7D Master thread

Nice raptor images!

Oct 17, 2009 at 10:34 PM

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