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What is the circular glare?

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CONTACTJJ

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I have tested with 2 zoom lens 1 fixed lens. All have the same glare. It is more visible under bright light, either pointing towards or away from the sun. I did all possible cleaning and on camera Clean Image Sensor. The glare is always there at the same location.



ceba8cfda85a4e35b4007b714d31cbec.jpg



7ef18b1891be41b8b7c278131644f77a.jpg
 
Since it doesn't change size based on focal length, it appears to be some kind of smudge on the sensor. Not sure how it got there...
 
Have a look at the sensor, something like that will be easily visible if its on the sensor. Perhaps a light leak from the lens mount.
 
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romfordbluenose said:
Have a look at the sensor, something like that will be easily visible if its on the sensor. Perhaps a light leak from the lens mount.
Click to expand...
Good point. Perhaps take a shot in the bright sun with the camera covered with a cloth. If it goes away, then probably light leak. Since it appears to happen with 3 different lenses, I suppose it would be the camera mount.
 
If all three lenses produce this same fault, I would suspect either the camera or the sensor. Light leak - maybe through the mounting bracket - or around it? Because it is perfectly circular I would suspect either a light leak or a reflection onto the sensor.
 
CONTACTJJ said:
I have tested with 2 zoom lens 1 fixed lens. All have the same glare. It is more visible under bright light, either pointing towards or away from the sun. I did all possible cleaning and on camera Clean Image Sensor. The glare is always there at the same location.

ceba8cfda85a4e35b4007b714d31cbec.jpg

7ef18b1891be41b8b7c278131644f77a.jpg
Click to expand...
This has popped up a couple of times. The problem is a hole or malfunction/issue with the shutter blades. You can confirm by taking a shot slower than about 1/180s and see the streak disappear or greatly lesson.

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My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)
 
Barleyman said:
romfordbluenose said:
Have a look at the sensor, something like that will be easily visible if its on the sensor. Perhaps a light leak from the lens mount.
Click to expand...
Good point. Perhaps take a shot in the bright sun with the camera covered with a cloth. If it goes away, then probably light leak. Since it appears to happen with 3 different lenses, I suppose it would be the camera mount.
Click to expand...
It's not an issue with the actual sensor. It's an issue with how light gets to the sensor
 
Slower?
Mako2011 said:
CONTACTJJ said:
I have tested with 2 zoom lens 1 fixed lens. All have the same glare. It is more visible under bright light, either pointing towards or away from the sun. I did all possible cleaning and on camera Clean Image Sensor. The glare is always there at the same location.

ceba8cfda85a4e35b4007b714d31cbec.jpg

7ef18b1891be41b8b7c278131644f77a.jpg
Click to expand...
This has popped up a couple of times. The problem is a hole or malfunction/issue with the shutter blades. You can confirm by taking a shot slower than about 1/180s and see the streak disappear or greatly lesson.

--
My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)
Click to expand...
--
Steve Bingham
www.dustylens.com
www.ghost-town-photography.com
Latest postings are always at the bottom of each page.
 
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Could you explain more. I'd like to understand. thanks
 
Steve Bingham said:
Slower?
Mako2011 said:
CONTACTJJ said:
I have tested with 2 zoom lens 1 fixed lens. All have the same glare. It is more visible under bright light, either pointing towards or away from the sun. I did all possible cleaning and on camera Clean Image Sensor. The glare is always there at the same location.

ceba8cfda85a4e35b4007b714d31cbec.jpg

7ef18b1891be41b8b7c278131644f77a.jpg
Click to expand...
This has popped up a couple of times. The problem is a hole or malfunction/issue with the shutter blades. You can confirm by taking a shot slower than about 1/180s and see the streak disappear or greatly lesson.
Click to expand...
Click to expand...
Yes, because at shutter speeds slower the flash sync speed the shutter will be exposed when there are no shutter blades moving in front of the sensor during exposure
 
Looks similar to what the shutter curtain void produced as shown in this link .
  • John
CONTACTJJ said:
I have tested with 2 zoom lens 1 fixed lens. All have the same glare. It is more visible under bright light, either pointing towards or away from the sun. I did all possible cleaning and on camera Clean Image Sensor. The glare is always there at the same location.

ceba8cfda85a4e35b4007b714d31cbec.jpg

7ef18b1891be41b8b7c278131644f77a.jpg
Click to expand...
 
Last edited:
fotowbert said:
Looks similar to what the shutter curtain void produced as shown in this link .
Click to expand...
Interesting proposition ! The cause, a burn in a segment of the shutter, can be investigated without dismantling the camera.

It can be tested with images on a uniformly illuminated structurless surface or a uniform patch of sky. The contrast of the artifact should become stronger with shorter exposure time setting as the traveling slit gets smaller while the burnt hole stays the same size.

The hole may be visible with closed shutter and mirror up. curtain 1 before exposure, curtain 2 after exposure.

A suitable camera history that could produce this damage is by excessive exposure to a view with sun image near the edge of image with mirror up and closed shutter.
 
Wow, thank you so much for so many expert advice and analysis. You guys/gals are awesome.

Here is my test results:

1) wrap around the lens with light blocking material - did not remove the ghost glare. SO it is not mount light bleed.

2) tested with various shutter speed. 1/250 is the the slowest shuttle that will not produce the glare. Starting at 1/320, it starts visible.

Now, my wife said she did dropped the camera with lens to the tour bus floor while we were in Tibet. Could it shake up some shuttle parts? I cannot exclude the sun burn theory as the sun light there was pretty harsh.

It is a D7000 bought when it first came out. I would repair will be quite expensive. Would it worth it or get a new D7200 body and done with it?
 
CONTACTJJ said:
It is a D7000 bought when it first came out. I would repair will be quite expensive. Would it worth it or get a new D7200 body and done with it?
Click to expand...
Yes, get yourself a D7200, a good, dealer-supplied secondhand one with low number of clicks. Be done with the problem and get yourself a superb upgrade into the bargain.

That's what I would do in an instant.
 
Looks like a shutter problem. Should be easy enough to check.
CONTACTJJ said:
Wow, thank you so much for so many expert advice and analysis. You guys/gals are awesome.

Here is my test results:

1) wrap around the lens with light blocking material - did not remove the ghost glare. SO it is not mount light bleed.

2) tested with various shutter speed. 1/250 is the the slowest shuttle that will not produce the glare. Starting at 1/320, it starts visible.

Now, my wife said she did dropped the camera with lens to the tour bus floor while we were in Tibet. Could it shake up some shuttle parts? I cannot exclude the sun burn theory as the sun light there was pretty harsh.

It is a D7000 bought when it first came out. I would repair will be quite expensive. Would it worth it or get a new D7200 body and done with it?
Click to expand...
 
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