| Author |
Message |
    
Tom
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, December 14, 2004 - 10:55 am: | 
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My A-1 (original owner) seems to be underexposing outside the center. Prints are coming back with a darkened border. This problem is usually low battery but seems chronic now.
It appears more pronounced with lower light exposures and non-existant in bright light.
Camera or developer? Any ideas? |
rick oleson
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, December 14, 2004 - 11:26 am: |
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The camera body cannot cause this, regardless of battery condition or anything else. It sounds like vignetting at full aperture, which can be caused either by the design of the lens or by use of a too-thick filter or hood on the lens. It tends to go away at small apertures (ie, in bright light) because you then are not using the outer part of the glass. |
Tom
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, December 19, 2004 - 04:45 pm: |
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Thanks for the input -- your description matches my problem. Lens is a Kiron 28-85 Macro with a Vivtar A-1 filter -- same vintage as the camera. All pretty basic. The whole system has not had real heavy use -- maybe 2K exposures. Nor has it ever been damaged or exposed to weather.
In the past a battery change has made a significant improvement in the problem -- as it did this time. But now the problem persists to more of an extent than I like.
Given the mechanical interaction between body and lens could this be a friction or other drag problem affecting automatic aperture setting during exposure?
Is there any maintenance (camera or body) that can
possibly be done? |
Peter
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 18, 2005 - 05:02 pm: |
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This sounds like a sluggish diaphragm, oily blades or dirt etc. Try other lenses to check whether this problem goes away with a 'new' lens. |
