7D noise test ?

Did this earlier for my own edification and thought others might find it interesting.

I took multiple shots of a wall unfocused, no sharpening, no noise reduction either in camera or PP. I did a snippit from DPP
so I could look at samples side by side.

http://i285.photobucke​t.com …s/Forums/Captur​e2-100.jpg

http://i285.photobucke​t.com …les/Forums/Capt​ure200.jpg

DW

very.....VERY interesting

Where is the 1000% view ?

I only did the 200% because others have done so and then complained about noise patterns, I don't see any. Usually I won't even bother with 100%, its like using a bigger and stronger magnifying glass to look at news print and then complaining about the size of the dots. I am very happy with the 7D and don't like to pixel peep. I find this to be interesting though since with my 40D I get cleaner images at ISO 160 than at 100 but with the 7D 100 and 200 work best... almost equally.

Can you explain your test a little more clearly. I'm not understanding what's going on.

Stellgar
Thanks for the post.
I love the 7D, but It's uses are pretty specific.

Doesn't the 7D have 6400 as well? Is this shot properly exposed?

I didn't use all the ISOs available, just the ones I have been using the most or am interested in using. I did a very simple test shot. I pointed the camera at a white wall about six feet away used the on board flash, RAW, AWB, turned off all noise and sharpening, manual focused out of focus since I was more interested in camera noise than wall texture. I am sure that since the wall was a off white the exposure was puled down to represent 18% gray, histogram is centered. Opened all the files in DPP once at 100% and then again at 200% staggered them in order and used the W7 Snipping tool to grab the screen image.

I might be wrong but wouldn't there be less apparent noise if you shot a gray wall (instead of white under exposed)so the shots wouldn't be underexposed?

eosphotomanoftennessee wrote in post #9655083
I might be wrong but wouldn't there be less apparent noise if you shot a gray wall (instead of white under exposed)so the shots wouldn't be underexposed?

Probably here is the range from 100-12800 with a more correct exposure overexposed by about 1.5 stops puts the histogram to the right without clipping, viewed at 100%. All shots were in RAW no noise reduction either in camera or PP.
This was done just to give me a little more accurate info and thought I would share.

DW

http://i285.photobucke​t.com …s/Forums/ISO100​-12800.jpg

Nice - coming from a 30D perspective that's pretty damn tight.

maverick678 wrote in post #9654643
Where is the 1000% view ?

Here you go ISO 100 at 1000%

http://i285.photobucke​t.com …/Samples/Forums​/1000b.jpg


MOD EDIT: please note the image posting rules: long size max 1024 px.

hey how about 10 million percent? These aren't really useful without shooting another camera at the same target and conditions to compare against.

Awesome....thanks!

stellgar wrote in post #9656037
Here you go ISO 100 at 1000%

http://i285.photobucke​t.com …/Samples/Forums​/1000b.jpg

MOD EDIT: please note the image posting rules: long size max 1024 px.

Thanks for this, it is very interesting. I might try it on my camera!