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05/05/2004 01:17:33 PM · #1 |
As far as I can tell from reading, the following is true:
If you put a 50mm extension tube on a 50mm lens, and that's on a 1.6 crop factor digital slr - your resulting lens becomes a 160mm 1:1 lens (extension tube equal to lens doubles the focal length, times 1.6).
If the above is true (even if it isn't), how far away will I be able to focus? I know infinity focus is lost, but what about 10 feet away, or 50 feet away?
Thanks in advance for your help :)
Kris |
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05/05/2004 01:36:49 PM · #2 |
A 50mm tube on a 50mm lens should give you 1:1 mag. I am not sure if it will focus at 10ft but that should be about as far as you can focus if my memory serves me.
Greg
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05/05/2004 01:45:20 PM · #3 |
| If I'm not mistaken, the minimum focus distance will not change with the tube, that is how you go from 1:2 to 1:1. |
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05/05/2004 01:49:07 PM · #4 |
The tube allows the lens to focus at a shorter distance, however, most lenses already have some built in extension so you can probably achieve higher than 1:1 mag using the 50mm macro lens along with the tube. The extension tube does change the minimum focusing distance though, that is how it achieves higher mag.
Greg |
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05/05/2004 01:57:56 PM · #5 |
| Yes, I agree with you, Greg. Mostly I want to be able to leave the extension tube on and still take "normal" distance photos (not a macro). Is that possible? |
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05/05/2004 01:58:44 PM · #6 |
Ok I'll take your word for it!
For some reason I was thinking that I read that somewhere. |
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05/05/2004 02:02:27 PM · #7 |
It really depends on how much extension you put on. Less extension means you can retain focus at greater distances. Generally I have found that it is not worth trying to take "normal" pictures with tubes in place. I just put them on when I want to do a macro shot. It is a pain in the neck sometimes but the results are usually very good.
Greg
Originally posted by hopper:
Yes, I agree with you, Greg. Mostly I want to be able to leave the extension tube on and still take "normal" distance photos (not a macro). Is that possible? |
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