40D is a pixel-peepers nightmare.

number six wrote in post #3980219
Sure. And you've done it.

I just had a look with the eyedropper in PSP - I'm seeing RGB values like 255, 78, 114 all along the top of the shoulder.

-js

Awesome! Thanks - I always forget about the dropper tool. I was checking my RGB histogram, but because most of the red actually falls in the correct region, it looked ok there.

Thanks again. I always forget, but there's a colourdropper tool on Mac's which you can use to zoom and find the RGB values for anything your mouse pointer is over. Very useful.

fe3836 wrote in post #3980370
Damn, I should've known. He's a Nikon guy !

What I'm really intersted in though, is a serious rebuttle of his findings. How did he distort the facts? How did he manipulate the A/B comparison images he posted? Don't we all learn something when a myth is debunked ?

He does speak crazy talk. However, I actually find his philosophy very sound.

From what I gather, he is very much into the photo side of things, over the equipment. He basically forsakes colour space, RAW shooting and so on - he basically says that differences in the final product are negligible, if you know what you are doing from the beginning, and believes that the photo speaks for itself. Which is very admirable - with all the technological advances these days drawing out every pixel of quality out of our images, we can easily get tied up on the minutiae and forget about the 'big picture'.

Thing is, I enjoy obsessing and dicussing about those little things.

CA has always been a function of the lens.

Some lenses are worse than others. Some much worse.

Any lens test I've read indicates that even the best exhibit some CA.

http://www.photozone.d​e …ses/canon_135_2​/index.htm

It can be fixed in CS and LR.

Glenn NK wrote in post #3980478
CA has always been a function of the lens.

Some lenses are worse than others. Some much worse.

Any lens test I've read indicates that even the best exhibit some CA.

http://www.photozone.d​e …ses/canon_135_2​/index.htm

It can be fixed in CS and LR.

Yes, I know, but at 100%, higher resolution images will have CA spread across more pixels - so only relevant if you're a pixel peeper, and irrelevant in the real world. I wasn't trying to be negative about the 40D, it was just my way of demonstrating that pixel-peeping doesn't really mean anything, and you kind of have to relearn your 'feel' when you change cameras.

fe3836 wrote in post #3979997
According to this article, at 12mp, APS-C sensor has reached a limit and streches your lens one step too far.
http://www.kenrockwell​.com/tech/full-frame-advantage.htm

Here is the bombshell for people with no time to read it:
$100 zoom + FF is sharper than $3k lens + best APS-C.

I wonder why the net hasn't boiled with arguments about this claim yet.

I think that without knowing it this guy has just proven once again just how much better Canon performance is over Nikon. I have seen many times and have come to the same conclusion that the 5D and 40D take very simular "quality" pictures. However these examples posted here are clearly different.

Canon Rocks!!!

pgiancola wrote in post #3980177
What lens are you using? The 17-55 IS. I have seen similar CA on that lens at 17mm. A good camera will bring out the CA a bit more in my experience. I have heard many 5D users complain about CA with lenses where they never had the issue before getting a 5D. The 5D might just be exposing what was always there and could not be seen.

Actually, I expect most 5D users complain about CA because they were using a crop sensor before and now they're seeing the entire image circle of the lens. CA is usually (but not always) worse towards the edge of the image circle than towards the center, and so the crop sensor doesn't capture the worst of it while a fullframe sensor does.

That's quite a different situation from the 40D, which has a crop sensor but a higher pixel density. In the case of the 40D when looking at images in 100% pixel peeping mode CA will be more readily apparent because more pixels will show what CA is there relative to a lower pixel density sensor (like that on the 350D or 30D).

fe3836 wrote in post #3979997
According to this article, at 12mp, APS-C sensor has reached a limit and streches your lens one step too far.
http://www.kenrockwell​.com/tech/full-frame-advantage.htm

Here is the bombshell for people with no time to read it:
$100 zoom + FF is sharper than $3k lens + best APS-C.

I wonder why the net hasn't boiled with arguments about this claim yet.

anything mr rockwell has to say should be taken with a large scoop of salt - preferably thrown in his eyes..

the man is an arse...

IMO - the above view is not necessarily the view of POTN or canon..

Mr. Rockwell also seems to not know how to use his Canon's well - a lot of inaccuracies in his article - like a canon flash doesn't tell you when you've underexposed (it does) - he needs to read his manuals.

might be a good time to go try out another lens(s) or maybe rent something nice for a day like a 17-55 and see if your problems persist

Bukka wrote in post #3980060
post!
(sry, this is just so i can read that link when i get home)

Instead, you could click on "Thread Tools" at the top of this thread and click "Subscribe to this thread." Then when you go to your control panel ("User CP") on the top-left of the site, if there are new posts in the thread, it will show up there.