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Autofocus Doesn't Work at Far Distances

lavie

Lexington, US
62 posts

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lavie Registered since 27th Feb 2007
Fri 12-Feb-10 06:58 PM | edited Sun 14-Feb-10 01:59 PM by lavie

I have a D300 and a 18-70mm/f3.5-4.5 G ED AF-S lens.

I just noticed that when photographing objects at great distance (distant mountains, etc.), the autofocus won't focus at a very wide angle (from about 24mm to the minimum 18mm). I think this is a new problem. This is true even when photograping a very contrasty subject, such as a dark mountain ridge against a bright sky.

This problem is most severe when the camera is held horizontally (landscape). When the camera is held vertically (portrait), it usually focuses.

Sometimes the lensmakes a bit of noise but doesn't "beep" to indicate focus, and sometimes the lens simply does nothing.

From about 25mm to 70mm, there is no problem - even in low light or when the subject is of low contrast and has no distinct borders.

Is this a lens problem or a camera problem? Would the warranty cover the fix? The lens is from Aug 2006, and the camera is from Mar. 2008.

TIA for any responses. I am generally very satisfied with lens, and this is driving me nuts.

Lavie

Lavie

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