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10/26/2006 09:48:01 AM · #1 |
Sorry to have two questions posted back-to-back...
How physically close to the subject do you think I can get while keeping sharp focus and detail with the following two lenses:
Tamron SP AF 28-75mm f/2.8 XR Di for Canon
Canon EF 50mm f/1.8 II
Do either of them have problems getting as close "as advertised"?
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10/26/2006 09:52:44 AM · #2 |
The Canon has a minimum focusing distance of 1.5'...if you're closer, your AF won't lock in. if you're at the minimum distance, there's absolutely no reason why you can't achieve tack sharp images with that lens.
I have no clue what the Tamron's minimum focusing distance is, but it will work the same way. Although, I'm certain that lens isn't as sharp at the 50 is.
Message edited by author 2006-10-26 09:53:03. |
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10/26/2006 10:12:22 AM · #3 |
some lenses have what's called decentering which means at certain focal lengths the focus will be just a little off. Normally you wouldn't even notice, unless you were taking a photo of something close up - then it would be more apparent.
It's rare that this is ever a problem. I'm thinking you must have read it somewhere and you're now nervous that your lenses do it. They don't, any distance should yield sharp photos as long as the lens is sharp.
edit to say - by "any distance" I mean within the lenses ability to focus. Only a macro lens can get "really close" - or use extension tubes as stated below me.
Message edited by author 2006-10-26 10:22:21. |
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10/26/2006 10:13:03 AM · #4 |
thanks heathen - 'preciate it.
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10/26/2006 10:19:14 AM · #5 |
| If you need to get closer with those two lenses for macro shots, you can get extension tubes that you attach to the lens where you mount it to the camera. Kenko makes a popular set of 3 of different lengths that you can stack for different closeness. The only drawback is that you lose more depth of field the longer the tube is. |
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10/26/2006 10:43:35 AM · #6 |
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10/26/2006 10:54:35 AM · #7 |
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