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Thread started 30 Sep 2010 (Thursday) 23:59
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7D bullseye banding?

 
2KPHOTO
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Sep 30, 2010 23:59 |  #1

I was out shooting tonight and noticed after I got on the computer theres some sort of banding/circular thing going on in the middle of the photo.
Has anyone else encountered this before?
it was a 30 second exposure @ f5.6 500 ISO


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Nickc84
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Oct 01, 2010 00:13 |  #2

UFO?




  
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Photon ­ Phil
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Oct 01, 2010 00:33 |  #3

This is a wild guess but it looks to me like a piece of material in front of your sensor heated and bowed inward pressing on the sensor and created these Newtonian Rings.

Congratulations, you may have found a 7D problem.

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Oct 01, 2010 00:47 |  #4

Which lens were you using? Seems more like an issue w/ the lens, not the camera. Was there a UV filter or some kind of filter attached to the lens as well?


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2KPHOTO
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Oct 01, 2010 01:08 |  #5

Phil- my sensor is intact
Jwcdds- I was using a Tokina 12-24 and yes there was a UV filter attached, you think this may be the cause?


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Oct 01, 2010 01:17 |  #6

Well, if your 12-24 is anything like my 11-16 (convex outer lens), then my guess would be the UV + outer element resulted in what you see in your photo. Couldn't hurt to try it again w/o the UV filter and see (assuming the aurora is still hoverin' about).


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EOS ­ mE
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Oct 01, 2010 01:32 |  #7

looks more like UFO to me.. lol~ UFO from the newly found planet G.


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2KPHOTO
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Oct 01, 2010 01:36 |  #8

thanks JDUB, it's probably gone by now
I would be lucky if I caught it again with the rising moon


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Oct 01, 2010 01:40 |  #9

Well, these rings should be reproducible. Perhaps find something that is dimly lit and make sure to aim the center at it and shoot it under similar conditions and you should still be able to see the rings again. And then take another identical shot, except with the filter off (and if all goes well), the rings should be gone.


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Oct 01, 2010 11:35 |  #10

I'll try that, thanks, appreciate your input


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Jim_T
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Oct 01, 2010 12:44 |  #11

I had the very same thing happen to me while shooting the aurora about 7 years ago using a 10D... (I know it was 7 years because my 10D was pretty new :) ).

Several shots came out with the exact same bulls eye pattern. It only did it that one night. I deleted these photos... (I should have kept them and we might have compared settings)... I've taken countless photos of the aurora since then using the 10D and other DSLRs, and it has never happened again.

I have no idea what could have caused it.. Perhaps the aurora produces some weird sort polarization on rare occasions that is captured by camera lenses.. Of course, this is only a guess.




  
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Oct 01, 2010 12:46 |  #12

I believe you are seeing a trans dimensional shift in the space time continuum ... Lets call the DOCTOR for help lol.


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Lowner
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Oct 01, 2010 12:49 |  #13

My instinct would be to blaim the filter. To be sure you need to do some controlled experiments. Changing just one parameter at a time, keeping everything else exactly like the original.


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Oct 01, 2010 13:08 as a reply to  @ Lowner's post |  #14

It's a fairly well-known phenomenon, caused by using a UV or protective filter...


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Oct 01, 2010 13:12 |  #15

I would take off the UV filter.

I have seen on my 7D what odd things a UV filter can do, at least with the 70-200 f/4 L I used to own.




  
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7D bullseye banding?
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