D7200 Dark Frames

What does the EXIF data show?
Have they maybe set the exposure compensation to underexpose?
I've done that :) by mistake
 
I had the same problem it turned out I had a faulty sigma 150-600mm lens. Lens was replaced no problems since
 
How many cameras are we taking about? Is it occurring with the same lens or different lenses. When you same dark frame is an under exposure or a completely black frame? Are there any custom settings or auto iso in use? Are we talking with exactly the same subject and lighting it’s occurring (ie ok exposure, ok , ok, dark, ok) rather than different subjects/lighting?

Not triggering may be because it’s struggling to achieve focus and the custom setting is set to focus if lighting is really bad or there is no contrast. Under exposed frames with auto iso could be because a changing in light or different subject with limited iso range set means the camera doesn’t have the leeway to get a good exposure.
 
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You'll need to compare the exif of the underexposed frame to the next in the sequence that's good. Could be the lens. Both? cameras with faulty shutters, maybe but unlikely without an error.
 
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Unlikely both would be intermittently faulty at the same time.
 
twist said:
You'll need to compare the exif of the underexposed frame to the next in the sequence that's good. Could be the lens. Both? cameras with faulty shutters, maybe but unlikely without an error.
Click to expand...
Probably the best way forward. Its unlikely to be a fault with both cameras or both lenses but not unheard of. Like @twist says look at the settings of the images either side of the dark frames.

It would be interesting to see the examples. Are we talking under exposed frame or completely black frame? Are settings exactly the same on the good and bad exposures?
 
I'm at a loss.... the only thing I can think of is the odd occurrence of the same combination of user error. I.e. shutter release set to focus and unable to attain focus (MFD), spot metering, etc.
 
I've had this occur before on my D7200. Was at evening event on continuous shooting mode.

Pretty sure it was my 18-200mm VR DX lens that was onboard.

First 2-3 shots of burst fine, 2-3 totally underexposed images then back to normal again.

This happened on about 3-4 burst shoots throughout the evening. Only discovered when doing PP.

Only happened at this one shoot, a very changing light situation all the same but totally baffled me at the time.

Dougie.
 
Snapper67 said:
I've had this occur before on my D7200. Was at evening event on continuous shooting mode.

Pretty sure it was my 18-200mm VR DX lens that was onboard.

First 2-3 shots of burst fine, 2-3 totally underexposed images then back to normal again.

This happened on about 3-4 burst shoots throughout the evening. Only discovered when doing PP.

Only happened at this one shoot, a very changing light situation all the same but totally baffled me at the time.

Dougie.
Click to expand...


That is exactly what the girls are experiencing but they have been deleting those images as they go along, trying to find if any have survived their culls
 
mike weeks said:
That is exactly what the girls are experiencing but they have been deleting those images as they go along, trying to find if any have survived their culls
Click to expand...

I'll have a look through mine as well, but 90% sure I just got rid.

Dougie.

Edit :- As i thought, didn't make it off the card.
 
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Looks like this for underexposed


1/1600s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 09:09:26
13.5MP (4,496x3,000) NIKON D7200

and this for normal


1/1000s, f/5.6, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 180mm, 01/07/2018 09:07:52
13.5MP (4,496x3,000) NIKON D7200


Note the focal length of the underexposed

Sequence of 4


1/2000s, f/4.2, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 48mm, 01/07/2018 10:45:34
13.5MP (4,496x3,000) NIKON D7200


1/1250s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 11:05:41
13.5MP (4,496x3,000) NIKON D7200



1/1250s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 11:05:45
13.5MP (4,496x3,000) NIKON D7200


1/1250s, f/5.6, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 125mm, 01/07/2018 11:05:57
13.5MP (4,496x3,000) NIKON D7200
 
mike weeks said:
Looks like this for underexposed


1/1600s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 09:09:26
13.5MP (4,496x3,000) NIKON D7200

and this for normal


1/1000s, f/5.6, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 180mm, 01/07/2018 09:07:52
13.5MP (4,496x3,000) NIKON D7200


Note the focal length of the underexposed

Sequence of 4


1/2000s, f/4.2, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 48mm, 01/07/2018 10:45:34
13.5MP (4,496x3,000) NIKON D7200


1/1250s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 11:05:41
13.5MP (4,496x3,000) NIKON D7200



1/1250s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 11:05:45
13.5MP (4,496x3,000) NIKON D7200


1/1250s, f/5.6, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 125mm, 01/07/2018 11:05:57
13.5MP (4,496x3,000) NIKON D7200
Click to expand...



Weird. Logic would suggest this is some kind of contacts problem but I'm not so sure on that .........

Lets just say I'm eagerly awaiting the next firmware update for the camera.

Dougie.
 
Snapper67 said:
Weird. Logic would suggest this is some kind of contacts problem but I'm not so sure on that .........

Lets just say I'm eagerly awaiting the next firmware update for the camera.

Dougie.
Click to expand...

Just updated on Sunday to 1.04, waiting to see if it happens again

Intend to contact Nikon about this

Mike
 
mike weeks said:
Looks like this for underexposed


1/1600s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 09:09:26
13.5MP (4,496x3,000) NIKON D7200

and this for normal


1/1000s, f/5.6, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 180mm, 01/07/2018 09:07:52
13.5MP (4,496x3,000) NIKON D7200


Note the focal length of the underexposed

Sequence of 4


1/2000s, f/4.2, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 48mm, 01/07/2018 10:45:34
13.5MP (4,496x3,000) NIKON D7200


1/1250s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 11:05:41
13.5MP (4,496x3,000) NIKON D7200



1/1250s, f/3.5, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 8mm, 01/07/2018 11:05:45
13.5MP (4,496x3,000) NIKON D7200


1/1250s, f/5.6, ISO 400
Mode: A, Meter: Matrix, No Flash, Auto WB
Focal: 125mm, 01/07/2018 11:05:57
13.5MP (4,496x3,000) NIKON D7200
Click to expand...
Not only is the focal length showing as 8mm on 28-300mm lens the aperture value is going to its widest setting at f3.5.

Guessing the 13.5MP means it’s in a crop mode.
 
mike weeks said:
Nikon asked for further details
Click to expand...
That's not really surprising though, is it? Getting some useful deals out of you on this thread has been like pulling teeth.
 
StewartR said:
That's not really surprising though, is it? Getting some useful deals out of you on this thread has been like pulling teeth.
Click to expand...


You can only answer what you can answer and I answered every point that was raised

Nikons advice

Thank you for your update.

I find it a very odd occurrence in fairness, considering the number of items involved and the fact that there is no known issue with this lens/camera configuration.

Have you tried cleaning the lens and camera mount contacts?

https://www.nikonimgsupport.com/eu/BV_article?lang=en_GB&articleNo=000006511

Do you use any accessory on the front of the lens, that would possibly strain the lens mount due to increased weight and cause contact issues - i.e. a ring flash?

Also, are the cards you are using listed in the chart below? Incompatible memory cards can cause various electronic issues with the equipment, although it seems less likely in this case.

https://www.nikonimgsupport.com/eu/BV_approved_memory_cards?lang=en_GB


Mike
 
Very odd, especially with it registering a focal length as 8mm on a 28-300mm lens :confused: Got to be a gremlin in the electronics somewhere for this to happen. Did you say you'd tried the lens on another body?
 
snerkler said:
Very odd, especially with it registering a focal length as 8mm on a 28-300mm lens :confused: Got to be a gremlin in the electronics somewhere for this to happen. Did you say you'd tried the lens on another body?
Click to expand...

I have 6 or 7 of the lenses and a number of D7100s, D7200s along with a few other cameras and this has happened with 2 of the D7200s, it is infrequent and random. I came here to see if anybody else had similar happen and seems like I am not alone although Nikon say it is not a known fault, so have updated the firmware and cleaned the contacts and will see if it occurs again

Mike
 
mike weeks said:
++ snipped ++ I came here to see if anybody else had similar happen and seems like I am not alone although Nikon say it is not a known fault, ++ snipped ++
Click to expand...

In Nikon's defence, you may not be the only one with this problem but if no-one else has reported it to Nikon then it is "not a known fault" becuase they don't know about it :)
 
Bristolian said:
In Nikon's defence, you may not be the only one with this problem but if no-one else has reported it to Nikon then it is "not a known fault" becuase they don't know about it :)
Click to expand...

There is another potential answer and that is that they have seen the symptoms before but never found the fault, if I could find a way to get it to predictably repeat then it would be easier to help Nikon see if it is fixable, but I cant

mike
 
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