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06/16/2004 05:33:32 AM · #1 |
Would it be worth getting an extender for my 10d using my Sigma 70-300mm 4-5.6 APO Macro Super II lens?
Do these only work for canon lens or are there 3rd party products for Sigma lens too?
It is not really an issue if AF doesn't work. |
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06/16/2004 05:38:22 AM · #2 |
The Canon extenders will probably not work with non-Canon lenses (in fact, they only work with some L-ranges). I believe Tamron do an/some extenders, as do Sigma.
(Fixed typo.)
Message edited by author 2004-06-16 06:11:23. |
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06/16/2004 07:29:22 AM · #3 |
The Sigma extenders will not fit on the 70-300. The protuding rear element on the lens will physically prevent the connection. I believe the Tamron extenders have a recessed front element which will fit though.
You will lose the ability to autofocus, 1 stop of light with a 1.4x, 2 stops of light with a 2x, and I don't know what the quality will be like, but the Tamrons will work otherwise.
Edit: Actually, I haven't checked my Sigma 2x with my old 70-300, but I think I'm right!
Another edit: Jeez, how many typos?!
Message edited by author 2004-06-16 15:47:24.
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06/16/2004 03:46:32 PM · #4 |
Update.
The Sigma extender indeed does not fit on the 70-300.
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06/16/2004 04:17:32 PM · #5 |
If you wanted to mount it, you can use extension tubes (though you'll lose the ability to focus on infinity)
I use this occasionally to mount a Canon 100mm f2.8 macro on a 1.4x canon teleconverter (which can only normally be used with L series lenses)
a 25mm extension tube works
camera > 1.4xtele > 25mm extension > 100mm macro
Gets you pretty good magnifcation and the quality is okay too.
Showy Primrose Stamen taken with this setup (about 1/4 inch high)
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06/16/2004 04:26:37 PM · #6 |
The Tamron-F converters will fit onto the lens but I wouldn’t really recommend using TC’s with that lens. My experience indicates that the AF will hunt a lot and if you aren’t in strong light it may never lock on at all. You also get significant softening around the edges of the frame and increased CA.
Greg
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06/16/2004 04:57:21 PM · #7 |
Originally posted by Gordon:
If you wanted to mount it, you can use extension tubes |
Hmmm. I'd never considered combining an extender and extension tube.
Dunno what effect it'll have with my lens selection, but bang goes my weekend!
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06/16/2004 05:13:23 PM · #8 |
Originally posted by bod:
Originally posted by Gordon:
If you wanted to mount it, you can use extension tubes |
Hmmm. I'd never considered combining an extender and extension tube.
Dunno what effect it'll have with my lens selection, but bang goes my weekend! |
Its definately more a technique for close-up photography, but you can get good results from 'non-macro' zoom lenses in this sort of configuration for close-up shots. Putting the extension tube on means you lose infinity focusing (and often anything beyond a couple of meters really)
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