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Russell A.
Russell A., Camera and Video Technician
Category: Camera and Video
Satisfied Customers: 5018
Experience:  30 years of experience as a TV station technician gives me a unique understanding of technical equipment issues.
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I have a nikon d7100 with a nikor 70-300 lens. I take pics

Customer Question

I have a nikon d7100 with a nikor 70-300 lens. I take pics at 300mm and they look fine till I try to enlarge them, then they are all blurry.
JA: Thanks. Can you give me any more details about your issue?
Customer: I take them on a tripod with my camera set at ISO 100, 1/500 shutter speed and aperiture priority auto focus.
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Submitted: 1 year ago.
Category: Camera and Video
Expert:  Rick replied 1 year ago.

Hi. My name is*****'m a camera repair technician with over 20years in the business and I'll be glad to help you with your question today.

This is usually caused by a back- focus issue. This is when the camera focuses either slightly forward or behind the subject. If you can, try other lenses with the camera and compare the results. If they're the same, the problem is in the camera and will need to be calibrated. If it's just with that one lens, you may be able to use the built in AF fine tuning feature of the D7100.

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