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Cameras, Lenses and Accessories: Discuss Lens request and a lens/tc question...Morning all Firstly. My new lenses arrived this morning so if one of you mods would kindly put the following ...
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Old 14-06-2008, 12:08   #1 (permalink)
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Lens request and a lens/tc question

Morning all

Firstly.
My new lenses arrived this morning so if one of you mods would kindly put the following in the equipment review list and once I've have a goodly play I'll write reviews on the following;
Sigma 150 - 500mm Canon fit.
Sigma 18 - 125mm Canon fit.
Sigma 1.4x TC.

Secondly
Mmmm feeling a bit stupid as I think I already know the answer to this. But I'm going to ask anyway.

Would one of you goodly guru's kindly tell me why when I have the following connected to my 350D a 1.4 TC, 2.0 TC plus 150-500mm I only get a 1,000mm zoom?
Am I right in thinking that you can only use one TC at a time?

Ta muchly in advance.
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Old 14-06-2008, 12:30   #2 (permalink)
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Re: Lens request and a lens/tc question

Quote:
Originally Posted by daveyuk View Post
My new lenses arrived this morning so if one of you mods would kindly put the following in the equipment review list and once I've have a goodly play I'll write reviews on the following;
Sigma 150 - 500mm Canon fit.
Sigma 18 - 125mm Canon fit.
Sigma 1.4x TC.
I'll get it sorted out later today for you - thanks for doing it

Quote:
Originally Posted by daveyuk View Post
Would one of you goodly guru's kindly tell me why when I have the following connected to my 350D a 1.4 TC, 2.0 TC plus 150-500mm I only get a 1,000mm zoom?
Am I right in thinking that you can only use one TC at a time?
No, you can stack TCs, so you should get 2.4 x 500mm at the long end. Could be the camera is not detecting both, so only putting the one in the EXIF. Bet camera's noticed you've lost 3 stops tho'!
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Old 17-06-2008, 14:06   #3 (permalink)
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Re: Lens request and a lens/tc question

Quote:
Originally Posted by daveyuk View Post

Would one of you goodly guru's kindly tell me why when I have the following connected to my 350D a 1.4 TC, 2.0 TC plus 150-500mm I only get a 1,000mm zoom?
Am I right in thinking that you can only use one TC at a time?
I recently tried a Canon 300mm f2.8 with stacked Canon 1.4 and 2X converters but the exif only showed 600mm (and f5.6 ). I had to fit them in this order Lens => 1.4 => 2X => Camera.
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Old 17-06-2008, 15:27   #4 (permalink)
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Re: Lens request and a lens/tc question

Mike
Trust Sigma to be the other way round!!
lens=>> x2 TC=>> 1.4TC=>> Camera.
I've tried this setup on both my Canon 35D and my Canon 30D both of which have the latest firmware updates installed yet when you look at the exif data it only shows up to and no more than 1,000mm a odd connumdrum me thinks
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Old 17-06-2008, 16:08   #5 (permalink)
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Re: Lens request and a lens/tc question

I think it's a TC issue as opposed to the camera. I was using my 1D2n when I was playing.
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Old 17-06-2008, 16:16   #6 (permalink)
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Re: Lens request and a lens/tc question

Mike
I've asked the same question with Sigma and their reply is

"We would not suggest or recommend using 2 tcs together, the lens is
probably only picking up the 2x converter which is why you are getting a
reading of 1000mm. The lens may not pick up both tcs as it was designed
to work in this way".

Think that sums that one up, so I would think maybe that if the same was asked with Canon the chances are that they'd give the same or very to the same advice
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Old 21-06-2008, 10:54   #7 (permalink)
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Re: Lens request and a lens/tc question

Quote:
Originally Posted by M1ke A View Post
I recently tried a Canon 300mm f2.8 with stacked Canon 1.4 and 2X converters but the exif only showed 600mm (and f5.6 ). I had to fit them in this order Lens => 1.4 => 2X => Camera.

If i stack my canon 1.4x and kenko 2x it will shoot at f4
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