Camera and Video
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Hi. My name is*****'m a camera repair technician with almost 30 years in the business and I'll be glad to help you with your question today.
If the problem isn't that the lens aperture isn't set to the minimum, it may need some hands on diagnosis. Is there a camera shop nearby?
One other question. Is the 105mm lens a DX lens or direct drive?
That means there is something electronically wrong with the 300. Your local shop can probably verify this for you but, since it is Nikon, it will probably need to go to one of their authorized repair centers. Parts replacement like this usually requires reprogramming with software only their shops have.
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Wish I could do more to help but this is one of those things that can't be repaired over the internet.