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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 10 Oct 2009 (Saturday) 12:45
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Confused about sigma for canon AF converter

 
savone
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Oct 10, 2009 12:45 |  #1

I acquired a brand new 2x converter

Sigma APO Tele Converter 2x DG for Canon AF <<<< Printed on box

I know my camera is an EF mount so what is this AF? It fits on my camera and my lenses fit on the end of it but I do not have any auto focus when using it with my 70-200 f4.

Is this AF a different mount or do I just not have any autofocus because of the f4 (which turns into f8 with the converter on).

Can someone explain this AF thing to me?




  
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Tumeg
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Oct 10, 2009 12:59 |  #2

savone wrote in post #8796383 (external link)
I acquired a brand new 2x converter

Sigma APO Tele Converter 2x DG for Canon AF <<<< Printed on box

I know my camera is an EF mount so what is this AF? It fits on my camera and my lenses fit on the end of it but I do not have any auto focus when using it with my 70-200 f4.

Is this AF a different mount or do I just not have any autofocus because of the f4 (which turns into f8 with the converter on).

Can someone explain this AF thing to me?

From what I can understand, none of the current EOS cameras, support AF on f/8 or smaller lenses...
2x your 70-200 f/4, makes 140-400mm f/8....


| Canon 5D Mk II | Canon 17-40MM F/4L | Canon 50MM F/1.4 | Canon 85MM F/1.8 | Canon 580EX II |

  
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savone
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Oct 10, 2009 13:02 |  #3

Tumeg wrote in post #8796421 (external link)
From what I can understand, none of the current EOS cameras, support AF on f/8 or smaller lenses...
2x your 70-200 f/4, makes 140-400mm f/8....


Thats what I thought, I just wanted to make sure. I also just come across a chart that says the same on sigmas website. I guess I will have to sell this, its a shame because it is BRAND new.. :(




  
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gasrocks
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Oct 10, 2009 13:33 |  #4

And you do not know how to manually focus?


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savone
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Oct 10, 2009 13:47 |  #5

I do know how to manually focus but I find it tedious and annoying, specially with these small DSLR viewfinders.

Its up for sale if anyone is interested:

https://photography-on-the.net/forum/showthre​ad.php?t=764722




  
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GSH
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Oct 10, 2009 16:01 |  #6

savone wrote in post #8796383 (external link)
I acquired a brand new 2x converter

Sigma APO Tele Converter 2x DG for Canon AF <<<< Printed on box

I know my camera is an EF mount so what is this AF? It fits on my camera and my lenses fit on the end of it but I do not have any auto focus when using it with my 70-200 f4.

Is this AF a different mount or do I just not have any autofocus because of the f4 (which turns into f8 with the converter on).

Can someone explain this AF thing to me?

AF = Auto Focus ( i kid you not ) and therefore the Canon EF mount.

That combination (70-200 f4 + 2x) will only AF on a 1 series body and even then only on the centre AF point.


Geoff www.bhppix.co.uk (external link)
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Confused about sigma for canon AF converter
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