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DPChallenge Forums >> Hardware and Software >> 20D issues-quality,focus,noise...
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07/04/2005 09:05:36 AM · #1
I got this 20D in April, and have not been entirely happy with what I am getting out of it. Sometimes, GREAT shots, but mostly lack of focus with a lot of noise. I know some of you are going to say "manual focus", but frankly, I trust the camera more than my eyes! Are those of you with 20D's seeing similar issues?

I have talked to Canon, and they want me to send it in, which I plan to do - this week, but I wanted to know if others have had the same problems, and if it is this bad:

These photos were taken within minutes of each other in the same location:


100% crop
Canon 50mm f/1.8
f/1.8 1/2000sec
Aperture priority
ISO: 100


100% crop
Tamron 28-75 f/2.8
f/2.8 1/2500 sec
Aperture priority
ISO: 100


100% crop
Canon 75-300 f?4-5.6 IS USM
f/4 1/800sec
Aperture priority
ISO: 100

Thanks,
Linda
07/04/2005 09:11:33 AM · #2
100% crop from my 300D @ ISO 400.


I would say your shots are too noisy. It's difficult to say when you use the widest aperture, but I would say focus is off too.
07/04/2005 09:29:47 AM · #3
You have problems! If that is 100ISO, then that is far too grainy, and you are right that the focus looks bad. My 20D only has slight issues approaching yours where the subject is underexposed and the image "pushed".
07/04/2005 09:33:35 AM · #4
Originally posted by lhall:

I got this 20D in April, and have not been entirely happy with what I am getting out of it. Sometimes, GREAT shots, but mostly lack of focus with a lot of noise. I know some of you are going to say "manual focus", but frankly, I trust the camera more than my eyes! Are those of you with 20D's seeing similar issues?

I have talked to Canon, and they want me to send it in, which I plan to do - this week, but I wanted to know if others have had the same problems, and if it is this bad:

These photos were taken within minutes of each other in the same location:

Thanks,
Linda


Well to tell the truth I am no big fan of Canon but, those shots look worse then my E-1 at 1600 ISO! I would say you defiantly have e defective camera. As far as focusing I know that the 10D and 300D both had problems with back focus and it seems this may be the case in your camera also (or in the lens, I'm not sure) Best of luck and hope you get your problem resolved
07/04/2005 09:38:27 AM · #5
Originally posted by TomH1000:

As far as focusing I know that the 10D and 300D both had problems with back focus and it seems this may be the case in your camera also (or in the lens, I'm not sure)

The 10D has a minor back-focus problem, but the 300D doesn't have any. Linda's issue is a LOT more serious than a 'standard' 10D focus issue.
07/04/2005 09:45:43 AM · #6
Originally posted by PaulMdx:

Originally posted by TomH1000:

As far as focusing I know that the 10D and 300D both had problems with back focus and it seems this may be the case in your camera also (or in the lens, I'm not sure)

The 10D has a minor back-focus problem, but the 300D doesn't have any. Linda's issue is a LOT more serious than a 'standard' 10D focus issue.


I took shots at the same time with my 10D,using the same lenses, and they came out fine. My images from my 10D have always needed a little sharpening, but I've never had problems like I am having with the 20D.

I also do not see it as a "lens" problem either, since the issue seems to be much the same regardless of the lens.

Linda

*edited for clarity.

Message edited by author 2005-07-04 09:55:18.
07/04/2005 09:55:48 AM · #7
I'm just confused how you got all those 100% crops from those three lenses.
But I do agree that the grain looks bad for that ISO.
07/04/2005 09:55:52 AM · #8
Even at iso 100, the 10d-20d-300d-350d all have some noise...it's mostly apparent on dark backgrounds.
07/04/2005 09:58:13 AM · #9
Definitely send that to Canon--that's way too much noise for ISO 100.

(Are you shooting these RAW or JPEG)?
07/04/2005 10:02:19 AM · #10
I always shoot RAW, and I made no "out of camera" adjustments to these shots.
07/04/2005 10:10:16 AM · #11
Originally posted by PaulMdx:

Originally posted by TomH1000:

As far as focusing I know that the 10D and 300D both had problems with back focus and it seems this may be the case in your camera also (or in the lens, I'm not sure)

The 10D has a minor back-focus problem, but the 300D doesn't have any. Linda's issue is a LOT more serious than a 'standard' 10D focus issue.


Oh yes I agree 100%. In general, a CMOS sensor produces MUCH more noise then a CCD but because of itís design much of the noise can be removed at the chip level which Canon has done a fine job of doing but, because this is done at this level the user has no control over the process. It can not be turned on or off. It is what it is and thatís it. CCD noise must be removed on the other side of the sensor with software giving the user more control over the process. It looks like in her case that for some reason the chip is not removing the noise. This is interesting and maybe shows the real output of noise from the chip if no noise is removed.
07/04/2005 10:34:53 AM · #12
I've always used canon: S45, Rebel 300D. Rebel XT... and one thing I've always liked is the great image quality and the clean images it can produce even at ISO 400. judging from your shots ther is something very wrong with ypur camera. have you notice how the noise is white? wierd... looks like a "snow" fx, not like regular noise.

if you look at the reviews of this particular model, the 20D, everybody agrees it has a very clean sensor and it can go up to even ISO 800 without showing a almost any no noticeable noise.

goos luck with that, hope u get a replacement.

LM
07/04/2005 10:48:51 AM · #13
There's no post-processing involved in those pictures, right? It almost looks like you're underexposing, then pulling out the shadows in photoshop through shadow/highlight or curves. If there's no PP done, then something is definately wrong with your camera.
07/04/2005 11:19:05 AM · #14
Originally posted by deapee:

There's no post-processing involved in those pictures, right? It almost looks like you're underexposing, then pulling out the shadows in photoshop through shadow/highlight or curves. If there's no PP done, then something is definately wrong with your camera.


Yes, I quite agree - that's exactly what it looks like! No, no PP whatsoever on these.

The rep at Canon has asked that I send these shots on disk to them. (I'm actually sending them about 20 shots taken over the space of a month or so, so they can see what's going on.)

So...the 20D leaves tomorrow to go to Canon. We'll see what happens.

Thanks so much for all the input. I had read that some peeps were having focus issues with the 20D, but couldn't imagine that anyone was getting shots this bad without screaming about it!

Thanks,
Linda
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