LIPH
Topic Author
Posts: 841
Joined: Mon May 17, 2004 6:29 pm

Black Spot On The Lens?

Mon Jan 29, 2007 8:39 am

Looking into the viewfinder of my 30D I can see a little dust spot (shaped like a samll worm) in the lower right angle. Actually it is not a CMOS dust spot because it disappears changing the lens. I tried to look and clean (pretty quickly to be honest) the front and back side of my Canon 100-400 but it's still there. Any idea ? Thanks in advance.

Regards
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ranger703
Posts: 141
Joined: Fri Jul 01, 2005 12:13 am

RE: Black Spot On The Lens?

Mon Jan 29, 2007 8:57 am

More then likely to be some dust on the mirror if you are seeing it when you look through the viewfinder.I have something similar on my 20D,however it doesnt affect my pictures.
 
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JeffM
Posts: 7569
Joined: Sat May 07, 2005 3:32 am

RE: Black Spot On The Lens?

Mon Jan 29, 2007 10:10 am

Quoting LIPH (Thread starter):
Actually it is not a CMOS dust spot because it disappears changing the lens.

Obviously. Nothing on your sensor shows up in your viewfinder. Think about it.......

Most likey on your mirror.
 
Interpaul
Posts: 401
Joined: Sun Jul 25, 2004 8:19 pm

RE: Black Spot On The Lens?

Mon Jan 29, 2007 10:45 am

That lens is also known for sucking dust. Maybe there's some dirt inside your lens.

Jan
 
LIPH
Topic Author
Posts: 841
Joined: Mon May 17, 2004 6:29 pm

RE: Black Spot On The Lens?

Mon Jan 29, 2007 5:30 pm

Quoting Ranger703 (Reply 1):
More then likely to be some dust on the mirror i



Quoting JeffM (Reply 2):
Most likey on your mirror.

It does not affect my picture neither, but is there a way to get rid of it ?
Thanks.
Life sucks. Then you die. Live fast, die young.
 
Interpaul
Posts: 401
Joined: Sun Jul 25, 2004 8:19 pm

RE: Black Spot On The Lens?

Tue Jan 30, 2007 12:01 am

How could it be on the mirror, if it disappears when using a different lens?

Jan
 
CalgaryBill
Posts: 618
Joined: Thu May 04, 2006 12:27 am

RE: Black Spot On The Lens?

Tue Jan 30, 2007 1:08 am

Quoting LIPH (Reply 4):
It does not affect my picture neither, but is there a way to get rid of it ?



Quoting LIPH (Thread starter):
it disappears changing the lens.

These two comments contradict each other. If the spot is in the lens and you can see it in the viewfinder, then it's going to show up in pictures as well. To confirm this, try several shots of clear, blue sky at different aperatures.

But since you say it doesn't appear in pictures, the spot must be on the mirror. Of course, if the mirror is dirty you would see the spot regardless which lens you mount.

Time to do some testing to figure out which one it is.
B
 
codeshare
Posts: 1689
Joined: Tue Sep 10, 2002 2:23 am

RE: Black Spot On The Lens?

Tue Jan 30, 2007 1:53 am

Quoting LIPH (Thread starter):
it disappears changing the lens

Like JeffM wrote above it vould be on the mirror or maybe the camera viewfinder.

Quoting Interpaul (Reply 5):
How could it be on the mirror, if it disappears when using a different lens?

Because the mirror lifts up when the shutter is released.

KS/codeshare
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LIPH
Topic Author
Posts: 841
Joined: Mon May 17, 2004 6:29 pm

RE: Black Spot On The Lens?

Tue Jan 30, 2007 2:07 am

Quoting CalgaryBill (Reply 6):
Time to do some testing to figure out which one it is.

Thanks guys...Actually will check better if it shows in pics. As far as I'm concerned it shouldn't (also because it's quiet large and it should be easily visible...), but will give an extra look.

Thanks
Life sucks. Then you die. Live fast, die young.
 
Interpaul
Posts: 401
Joined: Sun Jul 25, 2004 8:19 pm

RE: Black Spot On The Lens?

Tue Jan 30, 2007 3:18 am

Quoting Codeshare (Reply 7):
Quoting Interpaul (Reply 5):
How could it be on the mirror, if it disappears when using a different lens?

Because the mirror lifts up when the shutter is released.

That doesn't depend on the lens he's using.

Jan

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