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12/10/2004 03:54:01 PM · #1 |
| Now I know a lot of people buy these for shooting macros. However, If I take my 50mm 1.8 and slap a 35mm extension tube in there, will it be similar to the 85mm 1.8 at all for shooting non macros? Does the sharpness start degrading rapidly? Do you lose F stops? I was thinking of using it mainly for headshots. Probably better to wait for the 85mm money to roll around but that could be months. Just wondering how these things worked. |
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12/10/2004 03:56:39 PM · #2 |
The extension doesn't make the lens act like a longer focal length, it just makes it so the lens can focus very closely. You also lose infinity focus. With 35mm of extension on a 50mm lens, you probably would not be able to focus beyond a foot or so.
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12/10/2004 03:59:00 PM · #3 |
| oh thanks a lot, that helps a ton. |
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12/10/2004 04:03:42 PM · #4 |
You will also lose some light - I'm not sure how much. I saw a formula for it in a book once, but I'm not sure where that book got too. With f/1.8 you should not have too much trouble, however. When I put tubes on my zoom at 200mm f/5.6 I notice.
Edit: Found this page that has more information. For your case, it looks like you will be losing about 2/3 of a stop.
Message edited by author 2004-12-10 16:14:47. |
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