having to send new lens back

[poah]

unaccetable levels of chromatic aberation

sharp as hell as well

[Mr Whippy]

Yikes thats pretty bad!

Dave

[beano500]

Ouch! I'm guessing here - that was from a lens that was designed for a 35mm format onto an APS-C sized sensor? Some of mine display CA, but then they are lenses designed 15, 20 or even 38 years ago!!!

...and I was discussing this recently. IMHO we probably always had CA at least as bad as this but never really appreciated it on film technology - plus we were'nt always gawping at images down at "grain"/pixel level to see it!


Having said that, if it's a new lens you'll need to establish whether it's a "design feature" or a one-off in the particular example, I guess?

[Mr Whippy]

My general purpose 18-200VR does get CA but only really when stuff is out of focus and at the edges, and I accept that because it's a stupid lens.

I'm guessing this is your Canon f2.0, and to be honest getting CA that bad in the middle IN focus is a bit much for a modern lens surely?

Dave

[Checkitoot]

?? that could be a problem with the wb and evaluation you used though - it looks ok in most of the image just on the bright bag. Before sending it back try again and instead of auto wb go for the dedicated one for the occasion

[Furyous]

From an amateurs POV,what makes this lens so sharp? Is purely down to the quality of the lens ?

[Checkitoot]

Furyous said:

From an amateurs POV,what makes this lens so sharp? Is purely down to the quality of the lens ?

can be a few things but one could be the camera setting, dunno what cam or lens he has (not checked for exif) but IS for example gives a crisp image, the sharpness can be how the camera processes the picture. The 5d for example on standard is rather sharp - it can be down to the unsharp style mask used (all do it to some extent)

though the CA can also give a sharp appearnce at times, by sharp, i mean bleeding which can make it look like it has been sharpened.

[poah]

Checkitoot said:

?? that could be a problem with the wb and evaluation you used though - it looks ok in most of the image just on the bright bag. Before sending it back try again and instead of auto wb go for the dedicated one for the occasion

not going to change anything tbh

[poah]

Furyous said:

From an amateurs POV,what makes this lens so sharp? Is purely down to the quality of the lens ?

the image quality at 100%, the amount of detail resolved. this is down to the optics

[havoc]

For the amateur here, what am I looking for? (what's the giveaway of C-A?)

[bramley]

Look at the shot that shows the bag close up, CA is the 'glow' around the bag.

[havoc]

bramley said:

Look at the shot that shows the bag close up, CA is the 'glow' around the bag.

Ah yes - very obvious now.

Thanks!

[pikey]

Poah, have you considered their might be a problem with the bag? The lady could have this buzzing light thing round the outside... fashion is a strange thing that frequently confuses me!

[RobDickinson]

Poah is it this lens?

www.photozone.de/8Reviews/lenses/canon_100_2/index.htm

Chromatic Aberrations (CAs)
The chromatic aberrations (color shadows at harsh contrast transitions) are exceptionally low with this lens despite a very slight increase towards medium aperture settings.


I guess then your copy is dodgy

[poah]

RobDickinson said:

Poah is it this lens?

www.photozone.de/8Reviews/lenses/canon_100_2/index.htm

Chromatic Aberrations (CAs)
The chromatic aberrations (color shadows at harsh contrast transitions) are exceptionally low with this lens despite a very slight increase towards medium aperture settings.


I guess then your copy is dodgy

yeah smart eh lol

[Gemm]

I've heard about the CA issue on this particular lens, so I don't think it's just you.

[RobDickinson]

I'd do some more tests before you send it back though, it may be an isolated incedent.

[poah]

nah its on a lot of pics. I was going to take it back before I shot that one above on sunday lol

[Stigmundfreud]

sorry if its been said but what lens is it and on what body?

[V6GTO]

Canon 100mm f2 on a 20D.

Martin.