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Photography Question 
Dean Huggins
 

Mirror/lens issue.


What can I do about a dark patch that appears in the bottom portion of a few of my pics now and then. Almost seems random. I have a Minolta SLR Maxxum 7D. The problem seems to occur when I am using my big lens, Tamron 200-500mm AF Di 1:5-6.3 86mm. I almost always shoot in manual focus with CCD anti shake on. The dark area extends horizontally all the way accross the bottom of my shots. It varies how much of the picture it darkens. Anywhere from a few % to nearly 50% of picture. I am assuming I am seeing the mirror. This it seems obvious to me is a timing issue. What should I do? DH


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7/6/2006 10:45:40 AM

 
Jon Close
BetterPhoto Member Since: 5/18/2000
  Can you upload a sample? Usually this is the result of using a flash with the shutter speed set faster than the maximum flash sync. If you're not using the flash, then it probably is as you suspect a failure of either the shutter or mirror. I can't think of a reason it would only occur with one lens and not others.


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7/6/2006 10:59:28 AM

 
Brendan Knell
BetterPhoto Member Since: 4/17/2005
  If you are using a flash, and since it's with a bigger lens, could it be that the lens is blocking some of the flash, thus casting a shawdow?


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7/6/2006 11:13:43 AM

 
Brendan Knell
BetterPhoto Member Since: 4/17/2005
 
 
 

© Brendan Knell
Sony Cyber-shot DS...
 
 
Does it look similar to this?


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7/6/2006 11:21:15 AM

 
Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
gregorylagrange.org
  If the mirror, I think the dark edge will be at the top. If the shutter, at the bottom.


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7/6/2006 3:27:35 PM

 
Jason A. Woodcock   if your using the pop up flash on you camera it like brendan says your lens is blocking the flash from the bottom part of the frame.


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7/8/2006 9:14:44 PM

 
Dean Huggins  
 
 
Thanks guys but I believe you may be off on the flash idea. This time I am uploading a pic of what happens. The pic shows a daylight cloud formation with above mentioned problem. As you can see this is not the round shape of a lens. Like I said in my first question sometimes it covers just a small area at the bottom and sometimes 1/2 of the shot. I am thinking some sort of timing issue between my mirror and shutter speeds?? The perplexing part is that it does not do it all the time. It may be some setting that I use that I am not aware of. Still need suggestions. Thanks. Dean


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7/9/2006 2:54:01 PM

 
Dean Huggins  
 
 
Thanks guys but I believe you may be off on the flash idea. This time I am uploading a pic of what happens. The pic shows a daylight cloud formation with above mentioned problem. As you can see this is not the round shape of a lens. Like I said in my first question sometimes it covers just a small area at the bottom and sometimes 1/2 of the shot. I am thinking some sort of timing issue between my mirror and shutter speeds?? The perplexing part is that it does not do it all the time. It may be some setting that I use that I am not aware of. Still need suggestions. Thanks. Dean


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7/9/2006 3:41:03 PM

 
Jason A. Woodcock   dean looking at this photo I would say you probably have a sticking shutter and your camera needs to be looked at by a camera repair guy.
one ? is the 7d film or digital?
if its film you can open the back and check to see if the shutter is sticking if its digital you mite be able to see it sticking if you look through the front of the camera with the lens off. watch out for your sensor.
good luck
JAW


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7/9/2006 6:15:50 PM

 
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