Having problems with your Nikon D300 Body Only Digital Camera ?

Nikon D300 seems to change and locked on a f stop!

\015 If I am shooting 640 @ f8 with 51 auto focus w 3D- The camera regularly changes on its own to 640@ F90 or F95 and locks on a center weight single focus showing one focus point on the LED screen and I cannot change it or the f stop back without shutting of the camera and removing the 80-400VR lens being used and trying again. It does this over and over again causing photos to be missed as they turn out pitch black. What am I doing wrong? So frustrating!! Any ideas? Thanks!\015

Answers :

Sounds like you have it in Shutter priority mode where your speed will always stay the same but your f/stop will change accordingly.
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Repair Help & Product Troubleshooting for Nikon D300 Body Only Digital Camera

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