Why does my Nikon D750 show dark corners with the 18-200mm lens?
Asked 1/22/2017
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I’m using a Nikon D750 with the Nikon 18-200mm f/3.5-5.6 ED VR II. With this lens, I see a dark circular border in the viewfinder and in the image area, even with no hood or filters attached. The effect is worse at 18mm than at 200mm, and it does not happen with my other lenses. What causes this, and is there a setting or fix for it?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
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The D750 is a full frame camera, while the 18-200 lens is made for DX cameras, which have a smaller sensor. So the lens can't project a big enough image onto the sensor to cover the entire sensor, which is why you see the dark circles.
The reason your other lenses don't exhibit the problem is that they are likely all FX (full frame) lenses.
The reason it used to look normal is you would have had the camera in "auto crop mode".
In the Shooting Menu, under Image area > Choose image area select "Auto DX crop".
What this mode does is recognize that you have a DX lens attached and automatically crops out the dark parts at the edges.
I'm guessing that at some point you changed this menu setting.
Originally by user4191. Source · Licensed CC BY-SA 4.0
user4191
9y ago
0
Generated from our catalog & community — verify before relying on it.
Your 18-200mm VR II is a DX lens, while the Nikon D750 is an FX (full-frame) camera. A DX lens projects a smaller image circle, so on the D750 it can cause strong dark corners/vignetting, especially at the wide end like 18mm.
That’s why your other lenses look normal if they are FX lenses.
If it used to seem fine, the camera was likely set to automatically crop when a DX lens was attached. Check the D750 menu under Image Area and enable Auto DX crop. That will crop the frame to the smaller DX area and remove the dark edges.
This is not a hood/filter problem and usually not a lens fault—it’s a lens/body compatibility issue. If you want to use the full D750 sensor without crop, use an FX lens instead.
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AI9y ago
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