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Problem with zoom lens - Help!
Old 04-13-2005, 11:21 PM   #1 (permalink)
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I am trying to use a 70-300mm AF G zoom lens on a Nikon D70 and all the pictures I take with this lens appears blurred (as in first picture).



I think this is not the 'back-focussing' problem common in some D70's because the camera works fine with the 18-70 D lens that came with the package (second picture).



Is this due to movement of camera or is there something wrong (possibly) with the lens itself? Should I use the tripod and remote shutter release every time I use this 70-300 lens? The lens is 3 weeks old and has one year warranty.

Thanks for your comments/advise in advance!
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Just a guess. . .
Old 04-14-2005, 12:11 AM   #2 (permalink)
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but it looks like a depth of field problem rather that a lens fault. The background falls into the confusion as it's suppose to do with such a shallow field of focus. If you are shooting in Macro Mode you have to be very carful of DOF. Without knowing for sure I'd guess that you are focusing at f16 and shooting at f2.8
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Re: Problem with zoom lens - Help!
Old 04-14-2005, 12:23 AM   #3 (permalink)
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With this image it looks like a tiny bit of motion blur.. either from being hand-held or just enough of a breeze moving the branch..


Israel
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Re: Just a guess. . .
Old 04-14-2005, 12:31 AM   #4 (permalink)
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The first one (with 70-300) was taken at 300mm focal lenght, f/5.6 and 1/125 shutter. Everything set at Auto mode (I wanted to make sure that it wasn't my fault in focussing).
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Re: Problem with zoom lens - Help!
Old 04-14-2005, 12:33 AM   #5 (permalink)
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Can 1/125 affect the photo taken at 300mm focal length? This is the first time I am using this lens.
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Re: Problem with zoom lens - Help!
Old 04-14-2005, 12:38 AM   #6 (permalink)
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The short answer is yes.. The basic idea, if you are not using a flash, is that at 300mm you should use a shutter speed of 1/300th or faster.. So, use 1/500th because that's the next higher shutter speed..



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Re: Problem with zoom lens - Help!
Old 04-14-2005, 12:40 AM   #7 (permalink)
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An expert I am not but the problem looks to be the focal length of your lense and possibly the f/stop. Digital cameras usually have a 35mm focal length equivalent to the marked focal length. I own a Canon 10D which has a 1.6 35mm equivalent. In simple terms when I am working at 200mm on lense in 35mm reality I am at 320mm. I think that is the right number, my math is not real good at 2 in the morning. If you are shooting fully extended at 300mm and have much of a 35mm equivalent you have the same as a very long lense which in basic photography class lead to a shallow depth of field. Also contributing to this will be your f/stop selection the more wide open the appature the more shallow depth of field will be. Photo one seems to just a bit out of focus, added with a shallow depth of field and possibly a bit of shutter shake because back to the long focal length. A tripod and cable release are always a good investment. Just don't do as I did and buy a tripod and head which weigh about 15 pounds. Maybe this will help until a real expert arrives on the scene. dlc
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It can\'t be Auto mode. . .
Old 04-14-2005, 12:44 AM   #8 (permalink)
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if you set the shutter and aperture. Perhaps you meant autofocus. If you were shooting at 300mm then you absolutely should be on a tripod. The longer the length the more pronouned camera movement will be. Also unless you lock down the focus any movement could knock out the focus just before the shutter snaps.
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Re: Problem with zoom lens - Help!
Old 04-14-2005, 12:52 AM   #9 (permalink)
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Thanks for advise. I have a pretty light weight tripod (which can be knocked off by wind) and a remote is on the way. Meantime, will follow your instructions to increase f/stop and shutter speed.
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Shutter
Old 04-14-2005, 12:53 AM   #10 (permalink)
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Thanks. Will remember it next time I am using this thing.
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