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300 f4 Focusing issue

fisherd80fun

Essex, US
539 posts

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fisherd80fun Silver Member Nikonian since 23rd May 2009
Fri 08-Nov-13 03:06 PM

I went to Conowingo Dam on Wednesday to photograph the many eagles visiting the area. I used my D800, 300f4, and TC1.4. I had the "usual" problem focusing on the eagles while in flight, but fully expected that. Focusing on a bird in flight is always a challenge.

The "focus hunting" was expected, and no problem. However, there were a few times that after it had problems focusing, that "locked up". When it got lost on the birds, I tried to focus on a tree, or something close, to bring it back into focus....It would NOT focus.

I had to manually focus, and that seemed to "reset" the focusing mechanism and I could use autofocus again.

Is this "normal"? I have only had the 300mm and TC1.4 for about a month, so I don't have a lot of experience with it.

Any feedback will be appreciated.....Thanks in advance.

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