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Old 06-14-2012, 02:26 PM   #11 (permalink)
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Debris on the lense or sensor. read the manual on how to clean it. I dont own a dslr but a can of air used to fix my old minolta 35.
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Old 06-14-2012, 02:41 PM   #12 (permalink)
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Originally Posted by madasax View Post
No it's always in the same spot. On the sensor face or underneath? Never cleaned one

That second pic would be in portrait then?

Ya well like I said take the lens off and just check the surface
something could have landed on there or is stuck on the back of the lens..
check it out and let us know
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Old 06-14-2012, 03:56 PM   #13 (permalink)
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Debris on the sensor is a normal part of DSLR ownership. That's a pretty big bit of something in there. However, it looks mobile and its size should make it easy to catch with a puff of air.

Check your manual for sensor cleaning. The XTi has a built-in sensor cleaning function which vibrates dust off the sensor. For a piece of debris this big, however, that won't do any good. It will just find it's way back on there (And indeed, it has. Part of the reason it keeps moving around is because this sensor cleaning runs on every startup). It needs to be removed from the camera altogether.

On your camera's Setup 2 menu you'll find both cleaning options, Auto and Manual. Select manual. This function will raise the mirror and open the shutter to expose the sensor for manual cleaning. Remove the lens and use a rocket blower like this one to blow the dust out. Hold the camera lens mount down and blow up into the mount a few times. Shut the camera off once done.

DO NOT USE COMPRESSED GAS.
DO NOT CONTACT THE SENSOR WITH ANYTHING BUT A DEDICATED SENSOR CLEANING KIT.
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Old 06-14-2012, 10:14 PM   #14 (permalink)
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the lens looks clean as fas as i can tell. Ill try to blow it out tomorrow and get it figured out, thanks for the help everyone - i will let you know results.

Also do i have to have the knob on a certain setting to get to the Set-up 2 menu?
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Old 06-14-2012, 11:13 PM   #15 (permalink)
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It is physically impossible for debris on the lens to produce a shadow that sharply defined. It can only be on the sensor.

To get to Setup Menu 2 - Hit the menu button and use the directional buttons.

You seriously need to read the manual and understand the basics of how to use this camera before delving into something like this, or you'll end up in trouble.
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Old 06-15-2012, 01:43 AM   #16 (permalink)
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Thanks again, i have red up a little in the manual and i watched a few good videos on youtube on sensor cleaning. I have one of the little pump-blowers like the one you posted so i may just try that and see if it works. Its just weird how one second it wasnt there and 2 seconds later it was
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Old 06-15-2012, 02:09 AM   #17 (permalink)
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Yep. Seems to come out of nowhere. Changing lenses a lot will introduce a certain amount of dust, and the zoom mechanism of some lenses can have more to do with it than others.

About once a year I use the 100-400 push/pull lens for airshows. That thing pumps all sorts of crap into the mirror box. This year it actually sucked up a bug and left it wandering around between the focus screen and the pentaprism... I have no idea where it is now.
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Old 06-15-2012, 02:55 AM   #18 (permalink)
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Wow, you live next to the railroad tracks. Must be hard to sleep sometimes. Ever shoot one of the cars, just for the heck of it?
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Old 06-15-2012, 01:52 PM   #19 (permalink)
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This year it actually sucked up a bug and left it wandering around between the focus screen and the pentaprism... I have no idea where it is now.
wow....really
thats crazy
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Old 06-15-2012, 02:04 PM   #20 (permalink)
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Quote:
Originally Posted by Mike Deep View Post
DO NOT USE COMPRESSED GAS.
DO NOT CONTACT THE SENSOR WITH ANYTHING BUT A DEDICATED SENSOR CLEANING KIT.
Quoted for truth. Don't use canned air!
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