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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 Sep 2009 (Sunday) 19:04
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Tripod collar for EF 100mm f/2.0 USM?

 
gezak22
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Sep 13, 2009 19:04 |  #1

Hi guys,

Do they make tripod collars for the EF 100mm f/2.0 USM lens? I do astrophotography and stars in one half of the image have a green tint to them while stars in the other half have a purple tint to them - even at f/4.5. I want to see if it's caused by sagging.

Also, suppose it's not caused by sagging and I bought the lens over 3 months ago, will Canon fix this? Is it covered by warranty?

Thanks guys.




  
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jrscls
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Sep 13, 2009 21:47 |  #2

No. You should be able to use a tripod on camera with such a lightweight lens.


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nordstern1
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Sep 14, 2009 00:25 |  #3

i think what you have is CA (Chromatic Aberration) which is normal for some primes in certain conditions. can you post some samples?

im not sure if "sagging" can cause whatever your having. well, in case it is the problem, then a tripod collar wont help. you need a new tripod head. by the way, i dont think a 100 2.0 is designed to accept a tripod collar.

welcome to POTN! :)


JOE
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toxic
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Sep 14, 2009 01:26 |  #4

Tripod collar doesn't fit and isn't needed. It's only needed for heavy lenses.

What you're seeing is longitudinal CA. Try stopping down another stop or two and see if it goes away.




  
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gezak22
THREAD ­ STARTER
Hatchling
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Sep 14, 2009 15:03 as a reply to  @ toxic's post |  #5

I figured they didn't make one.

Here is a thread over on cloudynights, which outlines the problem: http://www.cloudynight​s.com …collapsed&sb=5&​o=all&vc=1 (external link) 'Sub' means 1 exposure.

You'll have to scroll down a bit and open the attachments.

The thing is, even at f/4.5 the effect remains. It is not as bad as at f/4, but it's still there.




  
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gezak22
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Hatchling
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Sep 15, 2009 23:01 as a reply to  @ gezak22's post |  #6

Bumped.

Here is picture that shows the problem: http://i30.tinypic.com​/9bb48i.jpg (external link)

Basically, starts in the bottom left (left picture in link) have green halos while stars in the upper right (right picture in link) have red halos. The center looks fine.

Stopping it down to f/4.5 and nailing focus help, but the problem is still there.

Any ideas what I can try if not a lens collar?

Thanks.




  
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alMout
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Location: Georgetown, TX
     
Sep 16, 2009 15:26 |  #7

Maybe the lens glass is not quite square with the cell. That would explain opposite edges being on different sides of the focus. I would think it would be a warranty issue.


Alex

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gezak22
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Sep 19, 2009 15:21 |  #8

alMout wrote in post #8656869 (external link)
Maybe the lens glass is not quite square with the cell. That would explain opposite edges being on different sides of the focus. I would think it would be a warranty issue.

I contacted them, and they told me to send it in so they can take a look at it. I'll report back.




  
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Tripod collar for EF 100mm f/2.0 USM?
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