Lens problem - any ideas

[Golf4food]

I have a friend who owns an older Canon Digital Rebel (pre-XT) who is reporting the following problem with a lens he bought:

"It’s a Sigma 28-300. I’ve found that even with the sun shade on if the sun is out and you’re taking pictures outside everything comes out white. I guess it’s because of over exposure or flare or whatever. But if I put the little canon lens (the kit 18-55) on in the same situation, no problems at all. With the sigma if I play with the ISO and such I can get some decent pics but it’s a major pain in the ****."

Any ideas on what is causing this or how to fix it? (He bought it used, so no warranty that he knows of.)

 

[MICKEY88]

I have a friend who owns an older Canon Digital Rebel (pre-XT) who is reporting the following problem with a lens he bought:

"It’s a Sigma 28-300. I’ve found that even with the sun shade on if the sun is out and you’re taking pictures outside everything comes out white. I guess it’s because of over exposure or flare or whatever. But if I put the little canon lens (the kit 18-55) on in the same situation, no problems at all. With the sigma if I play with the ISO and such I can get some decent pics but it’s a major pain in the ****."

Any ideas on what is causing this or how to fix it? (He bought it used, so no warranty that he knows of.)

is he shooting auto or manual.... try higher shutter speed.. smaller aperture etc...

 

[seashoreCM]

It might be incompatible with the camera's automatic exposure circuitry and remaining full open. Can you adjust the aperture to be smaller manually?

Do you get any semblence of a picture as opposed to a totally white frame when you go to maximum zoom, which results in a smaller maximum aperture?

Digital camera hints: http://members.aol.com/ajaynejr/digicam.htm

 

[extreme8]

Are the aperture blades sticking open?

 

[MarkBarbieri]

I'd check the EXIF to see if it is reading and adjusting the aperture. I'd also do some comparison shots in lighting that works to see if DOF increases when you stop down the aperture (easier at longer focal lengths). That can help you determine whether it is a physical problem (everything thinks that the aperture is adjusting but it physically isn't stopping down), or a communication problem (the camera can't control the aperture on the lens because they aren't really compatible), or whether it is a user problem.

 

[jann1033]

I have a friend who owns an older Canon Digital Rebel (pre-XT) who is reporting the following problem with a lens he bought:

"It’s a Sigma 28-300. I’ve found that even with the sun shade on if the sun is out and you’re taking pictures outside everything comes out white. I guess it’s because of over exposure or flare or whatever. But if I put the little canon lens (the kit 18-55) on in the same situation, no problems at all. With the sigma if I play with the ISO and such I can get some decent pics but it’s a major pain in the ****."

Any ideas on what is causing this or how to fix it? (He bought it used, so no warranty that he knows of.)

he should be able to email sigma to find out if the 2 are compatible., see i take the easy way out

 

[mike_r]

When my Canon Digital Rebel started doing that it was the shutter that had died, a trip to Canon NJ and $200 later it was working fine.