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DPChallenge Forums >> Photography Discussion >> Teleconverter for Sigma 70-300 APO DG ?
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Showing posts 1 - 7 of 7, (reverse)
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 09/06/2007 05:59:23 AM · #1
Are there any teleconverters for Sigma 70-300 APO DG? I would like to know if I can increase the zoom factor by 1.4 or 2.0 and I believe I saw some guys out there who has done it earlier. On the contrary Sigma says their 2.0 teleconverter can not be used by this lens. Anyone who can help with this?
 09/06/2007 06:08:13 AM · #2
I believe it's physically possible, but you probably won't like it. You may also lose AF.
09/06/2007 06:35:43 AM · #3
According to the Sigma page. No.

sigma

Even if there was one, it would make your min aperture at least f8, so you would lose autofocus, and it would be really dark and hard to focus, not to mention your shutter speeds would be so slow it would be impractical. :(

Message edited by author 2007-09-06 06:37:58.
 09/06/2007 07:40:46 AM · #4
My friend has this lens and has pretty much left a 1.4x tc on it since he bought it. AF still works. I will verify he is using this same lens.

I have the Sigma 1.4x and am looking to sell it, if you get to the point of buying one. Pefect condition, all original packaging, etc.

edit: I was wrong, he has 100-400 F4 APO.

Message edited by author 2007-09-06 09:18:55.
 09/06/2007 09:23:25 AM · #5
Not recommended...You'll hate the results. Teleconverters work best on Fast Primes or fast top quality Zooms. Put them on so so average zooms and the so so gets magnified to awful...
 09/07/2007 08:44:42 AM · #6
KENKO make teleconverters that will work for you.

i use a 2x with my non ex sigma lens.
i think it was about 150 british pounds
 09/07/2007 09:53:59 AM · #7
Originally posted by dainmcgowan:
KENKO make teleconverters that will work for you.

i use a 2x with my non ex sigma lens.
i think it was about 150 british pounds


It works, but autofocus doesn't work well unless it's really bright out.
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