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DPChallenge Forums >> Photography Discussion >> What Is This Aberration?
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06/22/2007 07:53:54 PM · #1
So I have this "bow" showing up in every image I shoot with the 30D, though its most noticable when I shoot against sky. I've used 4 different lenses and have cleaned the sensor about a zillion times. It shows up in the same place in every image no matter which lens / lens hood I use. Before I send it to Canon, I'd love to know what could be causing it.

Any ideas?








06/22/2007 07:55:30 PM · #2
could it be a reflective suface inside the camera body?
06/22/2007 07:58:26 PM · #3
It looks to me like it might be a reflection off of something within the mirror box.
06/22/2007 07:58:39 PM · #4
I see some dust specs, which means you were probably shooting with a small aperture. Does the bow show up when you shoot with the lens wide open too?
06/22/2007 08:01:26 PM · #5
Originally posted by strangeghost:

I see some dust specs, which means you were probably shooting with a small aperture. Does the bow show up when you shoot with the lens wide open too?


Yeah, I've seen it at all apertures.

What could be reflective in the camera box that hasn't always been there? This has only been going on for a month or so. I've been using the 20D since the day I shot these pics.
06/22/2007 08:09:25 PM · #6
I wonder if the mirror isn't retracting all the way... if it is getting up far enough to be out of frame, but still in the edge of the image circle, the light reflected back off the mirror edge *might* end up as a curved reflection on the sensor, after bouncing off the rear element surface.
That seems like a real stretch, but I can't really think of anything else. In any case, it seems that it really needs to be looked at by Canon.

Edit:
Looking again and pondering... I don't think the mirror theory holds water. The orientation of the "bow" is such that, if it is reflecting off the rear element, it needs to be something at the side of the mirror box, not the top/bottom.
It is so bright that it seems unlikely the light is coming from a reflection off the rear element. Another possibility is a light leak around the lens mount. That also seems a remote possibility, but...
Yet another possibility is exposed reflective surface on the backside of the lens mount, inside the mirror box.
I'm kinda grasping at straws here.

Message edited by author 2007-06-22 20:20:57.
06/22/2007 08:28:35 PM · #7
Darn it, Fritz, I was counting on you knowing everything! I've racked my brain about it too and had another photog look at it. We both ended up scratching our heads. I'm not even sure how to tell Canon what the problem is, guess I'll send them pics! :P
06/22/2007 08:50:07 PM · #8
Hi Cindi,
Try a manual exposure of an evenly lighted card in low light with the lens off. This would eliminate everything about the lens which could be affecting the pic. Adjust shutter speed to get a good exposure.
Another thing to try would be a shot with the lens cap in place to look for light thru a crack in the lens mount.
Maybe it is a Florida sun burn in the sensor, do you use sunscreen on it?
06/22/2007 08:59:20 PM · #9
I'll give that a try, Waddy. Maybe its having a sunstroke? ;)
06/22/2007 09:04:08 PM · #10
That's your shutter that's gonna die soon...Send it to Canon now before it tears completely
06/22/2007 09:09:56 PM · #11
Originally posted by doctornick:

That's your shutter that's gonna die soon...Send it to Canon now before it tears completely


Ya think?? Shit. That camera is only a year old, ugh, what month did I buy it? Will have to check. I have shot a gazillion shots this year, but I think the 20D has more actuations than the 30 does. Grrrr. Grumbles and fusses.
06/22/2007 09:28:58 PM · #12
Originally posted by doctornick:

That's your shutter that's gonna die soon...Send it to Canon now before it tears completely


Thought about that but... isn't it in the wrong orientation to be shutter? And if it were the shutter movement getting interrupted, I wouldn't expect it to have that shape, or be as perfectly uniform from shot to shot.
06/22/2007 09:30:06 PM · #13
Ha! I found my original order. I bought it July 21st last year. Hello warranty!
06/22/2007 09:31:04 PM · #14
Originally posted by idnic:

Ha! I found my original order. I bought it July 21st last year. Hello warranty!


Well if it's gotta break...

:-D
06/22/2007 09:31:10 PM · #15
Originally posted by idnic:

Ha! I found my original order. I bought it July 21st last year. Hello warranty!


Whatever it may be consider it fixed lol.
06/22/2007 09:36:24 PM · #16
Originally posted by kirbic:

Originally posted by doctornick:

That's your shutter that's gonna die soon...Send it to Canon now before it tears completely


Thought about that but... isn't it in the wrong orientation to be shutter? And if it were the shutter movement getting interrupted, I wouldn't expect it to have that shape, or be as perfectly uniform from shot to shot.


The shutter mechanism is made up of several smaller blades and if one is warped or close to failure it might produce that at the same spot. I'm unfortunately talking from personal experience when my shutter decided to fail in Thailand back in February...
06/22/2007 10:07:42 PM · #17
Bah, I still hate sending it in. Shame. A.D.D. and service centers is not a good mix. Are they open weekends? Can I call them uhmmmm NOW?

Thanks for the help, guys. No matter the issue I guess its back to the mother ship for my little alien. Soooooo glad I have a backup.
06/22/2007 11:41:56 PM · #18
Reflection through view finder.

Just want to be of help even if I am wrong.
06/22/2007 11:53:37 PM · #19
Ummm.. its a canon? that explains it.
06/22/2007 11:58:27 PM · #20
Originally posted by idnic:

Bah, I still hate sending it in. Shame. A.D.D. and service centers is not a good mix. Are they open weekends? Can I call them uhmmmm NOW?

Thanks for the help, guys. No matter the issue I guess its back to the mother ship for my little alien. Soooooo glad I have a backup.


Wellllllllll, don't you really need *ANOTHER* 30D as a backup????????? You know you like the camera. Two of them would be sweet. Nes pas?????? Just buy another one and send the chump in and get it fixed. ;)
06/22/2007 11:59:50 PM · #21
Being that it is consistent and circular in shape, I think it looks like a reflection from the bayonet mount, either the lens or the body, and about the only way that appears to be possible is that the mirror is not completely lifting out of the way. Have you tried mirror lock up just for S&G and or run the sensor cleaning function to inspect it? Did it happen after a sensor cleaning perhaps?

Message edited by author 2007-06-23 00:01:00.
06/23/2007 12:23:31 AM · #22
Actually, it looks kinda cool in the vertical shots you posted. Happy to hear that your warranty is still ok, and that you have a backup camera body. I had the DT's when my S3 smoked out. (digital traumas) It was so bad that I bought a second one, and got the first one fixed as well.
06/23/2007 12:25:12 AM · #23
The Real question is....

How long will it take brad to make the Aberration disappear.
06/23/2007 12:53:55 AM · #24
Originally posted by RainMotorsports:

The Real question is....

How long will it take brad to make the Aberration disappear.


06/23/2007 12:59:43 AM · #25
Originally posted by RainMotorsports:

The Real question is....

How long will it take brad to make the Aberration disappear.


Ohhhhhhhhhhh! Good one!
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