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PostPosted: Mon Apr 02, 2012 9:45 am 
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Joined: Wed Jul 13, 2011 11:34 am
Posts: 76
Hi all
I'm using the 70-30mm lens on the D90 and my biggest problem is when trying to focusing on something in the distance like aircraft or cars (or small objects closer in like insects) some times the camera will lock on perfectly but more often than not its just a blur. I've tried swapping between single and cont focus and tried using spot focus but nothing really seems to help. I have also tried manual focus but with moving objects it never works.
Anyone else come up against this or have any advice?

Thanks!

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Nikon D90 + AF-S 18-55mm + AF-S 70-300MM F/4.5-5.6G IF-ED


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PostPosted: Tue Apr 03, 2012 7:36 am 
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Joined: Thu Oct 08, 2009 11:24 am
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It can be a problem even in good light. You're trying to focus on a small moving object and that can cause the lens to 'hunt'.

If its distant, why don't you just lock out the lens using manual focus at infinity?


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PostPosted: Tue Apr 03, 2012 8:35 pm 
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Joined: Wed Jul 13, 2011 11:34 am
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Tried that with no joy :(

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PostPosted: Wed Apr 04, 2012 8:33 am 
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Joined: Thu Jan 26, 2006 10:41 pm
Posts: 365
It's what I do for whales (with my 70-300 and the D90!). It works with moving (and small) subjects.

I focus on an object in the plane of the object I'll later want to photograph. THEN I switch the lens to manual focus, so it is effectively prefocused on when I will want to shoot. I think this is what Dubaiphil is suggesting too.

The focus is now set (but don't touch the focusing ring) and the correct exposure will be applied when you take the shot.

Cuts down on response time too - you'll get good FPS.

Of course, if the plane is coming toward tou, you'll need to select a point to focus and shoot when the subject reaches that point.

This is what I do with my D40 too - should work with anything.

For insects etc, make sure that the camera isn't focusing on the background etc.

The viewfinder on APSC DSLRs is not the best for critical focus, and you will need to check results on the camera regularly.

Hope this helps.

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Nikon DSLRs, film cameras from Leica to Linhof


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PostPosted: Thu Apr 05, 2012 9:31 am 
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Joined: Wed Jul 13, 2011 11:34 am
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Thanks guys I'll try it out!

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