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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 12 Sep 2011 (Monday) 11:17
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good copy 70-200 2.8 mark ii ?

 
Giorgos
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Oct 11, 2011 12:58 as a reply to  @ post 13101868 |  #31

back with my concerns..

a question for this shot

iso 800 f2.8 1/4000

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why this CA?
note i didnt have my lens hood on. will it be reduced if i had my lens hood on?
anyone with 70-200 is usm ii who has seen similar CA on his lens?


Also CA is the same for all copies of 70-200 2.8 is usm ii? because i thought it has to do with the quality of the inner elements, UD elements etc or am i wrong?

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TheBurningCrown
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Oct 11, 2011 13:21 |  #32

Giorgos wrote in post #13235408 (external link)
why this CA?

Bright backlight, out of focus, large aperture, hood would have made no difference.

Stop cropping your pictures, you'll be much happier.


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amfoto1
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Oct 11, 2011 14:29 |  #33

Do you have a "protection" filter on the lens? Those can make CA worse, especially lower quality filters. Try without the filter, if using one.

But be realistic about it, too. Any lens will show some CA along very high contrast, OOF edges, especially at certain apertures. Try stopping down to f5.6, that might help a little (greater depth of field = more in focus edges)...

But the best thing to do is try to get the subject against a less contrasty background.

Some CA can be corrected a bit in softwares, too.

The hood might not help, but it also can't hurt. I'd always use one.


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led ­ hed
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Oct 11, 2011 14:30 |  #34

lens looks to be front focussing on the above shot.


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Giorgos
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Oct 11, 2011 15:22 |  #35

led hed wrote in post #13235867 (external link)
lens looks to be front focussing on the above shot.

ye i know i probably focused on a branch before the animal. i use center spot focus.
i dont have focusing issues i was skeptical about the amount of CA and if its forgiven
for 70-200 2.8 is usm ii always speaking at 70mm 2.8

(i use b+w mrc uv haze filter so i dont think/hope it makes it really worse than it really is)

regarding the out of focus thing Dave, i didnt know that areas which are out of focus are more subject to CA. thank you
(i thought people searching for CA were invastigating all the photo not just the focused points and that they werent expecting CA at any point of the photo)
so Dave and others, u think its normal for "that" kind of lens?

i dont think i can exchange my lens now but i wanna know if i have a good one and i am concerned about nothing.

Edit: i just saw again the pictures and i think the branches of the crops have about the same distance from the point/branch (i think i focused)
and they doesnt seem to be out of focus (at the normal picture) (but in crops they sure do show like out of focus- just wondering about the out of focus thing and CA, but still high contrast i guess)


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TheBurningCrown
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Oct 11, 2011 15:33 |  #36

Giorgos wrote in post #13236084 (external link)
(i use b+w mrc uv haze filter so i dont think/hope it makes it really worse than it really is)

It will, it always does. Without getting into a "are protective filters worth it" debate, using a filter WILL degrade your image quality. That's simply a fact. The question is whether the situation makes the detriment noticeable or not. In this case, it very well may have made the CA worse. There's no way to know for sure. But it certainly didn't make it better.

Giorgos wrote in post #13236084 (external link)
so Dave and others, u think its normal for "that" kind of lens?

i dont think i can exchange my lens now but i wanna know if i have a good one and i am concerned about nothing.

It's not the lens, rather the situation. In that type of lighting you're more likely to get CA than usual, regardless of the lens.

The focus issue is a non-issue. It didn't miss focus, it focused properly. On the tree branch. Very likely not where you wanted it to focus, but it focused nonetheless.

My opinion: your lens is perfectly fine.


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Oct 11, 2011 15:40 as a reply to  @ TheBurningCrown's post |  #37

Yes it's sensor overload due to the transition from the blown out sky to the quite dark branch. It's not a lens issue.


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Giorgos
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Oct 11, 2011 15:44 |  #38

Frugal wrote in post #13236174 (external link)
Yes it's sensor overload due to the transition from the blown out sky to the quite dark branch. It's not a lens issue.

thank you for your help guys..
last question and i leave this thread to relax..
Richard how you seperate/know these two things. i mean if CA is from a lens issue or its sensor overload

again
thanks


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Oct 11, 2011 18:43 |  #39

Frugal wrote in post #13236174 (external link)
Yes it's sensor overload due to the transition from the blown out sky to the quite dark branch. It's not a lens issue.


OH really??? care to support your statement there?


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Oct 11, 2011 19:42 |  #40

c2thew wrote in post #13236981 (external link)
OH really??? care to support your statement there?

I second this...


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Oct 11, 2011 22:07 |  #41

davidc502 wrote in post #13101868 (external link)
People spend over 2 thousand dollars for this lens and they expect it to be perfect. If I spent that kind of money and it didn't meet my expectations I would be just as concerned.

Define perfect?

Out of all lenses Canon make, the 70-200mm series is probably the most reliable. Any issues with these lenses, I'd put in the user error basket.


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Oct 11, 2011 22:08 |  #42

why did you shoot at 2.8 outside?




  
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Giorgos
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Oct 12, 2011 03:36 |  #43

Fricks wrote in post #13237939 (external link)
why did you shoot at 2.8 outside?

As a newbie I like to experiment with subject isolation.. so I guess this kind of behaviour would be the same with another lens copy at the same circumstances.


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Oct 12, 2011 07:01 |  #44

You got a bad copy. Just give it to me :P.
Don't worry, looks very sharp, even thought you shot at f/2.8. Try to shoot at f/5.6, I believe it's the sweet spot.


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good copy 70-200 2.8 mark ii ?
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