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Problems W/ My 600IS at F36/F45

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by Rocky Sharwell on Wed Dec 10, 2003 9:04 am

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Greetings:

I had these funnly looking curved lines appear in some images from Bosque taken at F36 and F45. The lines appeared when I used different camera bodies--So I am fairly certain it is the lens. The lens worked fine otherwise. Any ideas?

http://www.naturescapes.net/memberpics/ ... hohihw.jpg
http://www.naturescapes.net/memberpics/ ... 5mqvx0.jpg

Thanks!

Rocky Sharwell

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by Wil Hershberger on Wed Dec 10, 2003 9:46 am

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Have you looked into the rear of the lens while pointed toward a light? What does it look like? Are these shots the full frame?

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by Rocky Sharwell on Wed Dec 10, 2003 10:01 am

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Will:

The shots are full frame.

I did not see anything obviously wrong looking into the rear of the lens. I did buy some long 100% cotton swabs and am really tempted to try and clean it with eclipse solution.

Rocky Sharwell

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by Cliff Beittel on Wed Dec 10, 2003 10:40 am

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At the back of the lens is not lens, but the drop-in filter, one of the functions of which is to keep dirt out of the back of the lens. Have you checked the filter?

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by E.J. Peiker on Wed Dec 10, 2003 12:11 pm

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This looks like either stress lines or dirt on the rear filter or perhaps, but less likely large streaks on the front elements. Smaller apertures will bring these things more into focus.

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by Rocky Sharwell on Wed Dec 10, 2003 1:05 pm

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I will check the rear filter tonight--I forgot all about it even being there.

Rocky Sharwell

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by Rocky Sharwell on Sat Dec 13, 2003 11:54 am

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Update:

The gelatin filter appears to quite dusty--but it doesn't show anything like the lines that appear in the photographs. I am planning on blowing off the dust (w/ bulb) and seeing what ahppenes.

Any suggestions?
Thanks

Rocky Sharwell

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by Joe Elliott on Sat Dec 13, 2003 10:54 pm

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Looks like out of focus condensation on an internal lens element to me. Or, where condensation and dust have mixed and dried on an internal lens element. That would be my guess.

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by KK Hui on Sun Dec 14, 2003 2:17 am

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Rocky Sharwell wrote: ... The lines appeared when I used different camera bodies--So I am fairly certain it is the lens. The lens worked fine otherwise. Any ideas? ...

You did not say what bodies, film or/and digital ... ??? Never rule out the body at this point if I were you, Rocky!

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by Rocky Sharwell on Mon Dec 15, 2003 8:37 am

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KK:

D10-10D and 1D are the bodies involved.

I got rid of the dust on the filter and cleaned the front element (which wasn't too dirty). It was gray all day yesterday so I will have to wait to see the result...

Rocky Sharwell

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by E.J. Peiker on Mon Dec 15, 2003 9:41 am

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Actually after looking at the pics again, I think a small branch or stick or grass probably fell into the lens hood and was up against the front element while taking these shots.

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by Rocky Sharwell on Mon Dec 15, 2003 1:49 pm

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I had a very productive lunch break. I believe I have solved the problem!

On my way to lunch I loaded a card into the camera--and mounted the 600 w/o the hood. I turned to the smallest aperture (F32), and handholding pointed at the blue sky. No bad lines appeared.

I put on my older 1.4TC--turned to F36 and F45 fired a few shots at each aperture--the lines were clearly visible.

I put on my almost brand new 1.4 TC--fired a few shots at F36/F45 no lines.

In case you are wondering why I have two 1.4 Converters--I bought a second one so that a friend can use my 300F4 and get some extra reach when we go out shooting.

Rocky Sharwell

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by KK Hui on Wed Dec 17, 2003 4:34 am

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That's good that you tracked down the source of the cause, Rocky!
But, what's wrong with the 1.4TC that is giving you this problem?

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by Rocky Sharwell on Wed Dec 17, 2003 8:35 am

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KK:

I haven't even looked at the TC yet--I am saving that for the Christmas holiday. I'm just glad it isn't the 600!

Rocky Sharwell

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