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Old Jan 25, 2005, 2:06 AM   #1
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I'm sure this question has been answered here before, but I can't seem to find it.

Does a 1.4x TC allow the zoom function or does it only work at full telephoto. I know that some tele-adaptors for digicams only allow focus at full telephoto.

I am particularly interested in the Sigma 1.4x coupled with a Sigma 70-200mm 2.8.

Other contenders are the Bigma, Sigma 100-300mm 4.0, and Canon 70-200mm 2.8 (IS and non-IS). I might even consider the Canon 100-400 4.0-5.6L IS.

Also, is there any advantage to the Canon 1.4TC other than the satisfaction of spending an additional$100?

Seems to me that Sigma 120-300mm 2.8 would be ideal but alas... it is out of my price range.

I want to try some wildlife (birds) and surf shots. Some of the unique native Hawaiian birds are about the size of a hummingbird and they keep their distance. 200 x 1.4 might still be too short but then a nice sharp photo will stand up to more cropping.

You guys with TCs; do you actually use them much?

Thanks a bunch

David


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Old Jan 25, 2005, 5:19 AM   #2
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Amateur wrote:
Quote:
Does a 1.4x TC allow the zoom function or does it only work at full telephoto. I know that some tele-adaptors for digicams only allow focus at full telephoto.

I am particularly interested in the Sigma 1.4x coupled with a Sigma 70-200mm 2.8.
Yes - It works on the entire range (98mm to 280mm)
Notice also that most lenses allow you to focus past infinity? This allow allows for folks to attach adapters in front (and back) and the camera can still achieve focus.



Quote:
Also, is there any advantage to the Canon 1.4TC other than the satisfaction of spending an additional $100?
Yeap - The Canon 1.4x just doesn't fit the Sigma 70-200 f/2.8 pure and simple! :?
(The Sigma 1.4x will fit the Canon though...)




Quote:
Other contenders are the Bigma, Sigma 100-300mm 4.0, and Canon 70-200mm 2.8 (IS and non-IS). I might even consider the Canon 100-400 4.0-5.6L IS.
The 100-300mm f/4.0 is really one of the sharpest zoom around - http://www.photozone.de/2Equipment/easytxt.htm#Ztelel :idea:
http://www.naturephotographers.net/je1001-2.html
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Old Jan 25, 2005, 9:16 AM   #3
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If you trying to take shots of birds the size of huumingbirds then 400mm is not much, you need more. Even if you can get very close, you have to worry about your min focussing distance. You can use tubes to help with that.
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Old Jan 25, 2005, 9:52 AM   #4
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That's my whole point in the other post: you can "modify" a lens greatly and the camera should still be able to autofocus correctly!
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Old Jan 25, 2005, 2:45 PM   #5
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NHL wrote:
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Amateur wrote:
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Also, is there any advantage to the Canon 1.4TC other than the satisfaction of spending an additional $100?
Yeap - The Canon 1.4x just doesn't fit the Sigma 70-200 f/2.8 pure and simple! :?
(The Sigma 1.4x will fit the Canon though...)

Assuming compatability, say on a Canon lens; is the Canon TC better than the Sigma?

Thanks for your information NHL

David
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Old Jan 25, 2005, 2:56 PM   #6
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bobbyz wrote:
Quote:
If you trying to take shots of birds the size of huumingbirds then 400mm is not much, you need more. Even if you can get very close, you have to worry about your min focussing distance. You can use tubes to help with that.
By 400mm, do you mean 400 x 1.6 (DRebel) x 1.4 (TC) = 896mm? or do you mean 400mm as the final product?

200mm x 1.6 x 1.4 = 448mm equiv FOV - not enough? I think a surfer at 1000ft will be about the same as a bird at 30ft.

Thanks Bobbyz

David
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Old Jan 26, 2005, 3:03 PM   #7
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Amateur wrote:
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Assuming compatability, say on a Canon lens; is the Canon TC better than the Sigma?

Thanks for your information NHL
It's hard to say since theses TC are referred to as 'matched' teleconverters - Sigma/Sigma vs Canon/Canon of course swapping Sigma/Canon will still work but they are really not 'matched' anymore

Plus IMO a white lensplus a black converter or a black lensplus a white converter (if it fits) look kind of 'funny' :-)



Here's a 2x Sigma/Sigma TC example: http://www.stevesforums.com/forums/v...mp;forum_id=65
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Old Jan 26, 2005, 3:23 PM   #8
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Amateur wrote:
Quote:
bobbyz wrote:
Quote:
If you trying to take shots of birds the size of huumingbirds then 400mm is not much, you need more. Even if you can get very close, you have to worry about your min focussing distance. You can use tubes to help with that.
By 400mm, do you mean 400 x 1.6 (DRebel) x 1.4 (TC) = 896mm? or do you mean 400mm as the final product?

200mm x 1.6 x 1.4 = 448mm equiv FOV - not enough? I think a surfer at 1000ft will be about the same as a bird at 30ft.

Thanks Bobbyz

David
I am talking 400mm lens focal length to start with. Have you tried a bird at 30feet with 400mm?

I don't shoot surfers but I have tried 100-400L on 10D in Santa Cruz. Most of the surfers prettt close by still small in frame. Using 1.4x for surfer shots on 400mm would be enough but I was referring to your comment about shooting hummingbird size birds. For that even 600mm is not enough. People routenly use 1.4x tc or 2x tc on top of that.


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Old Jan 26, 2005, 8:50 PM   #9
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Thank you guys I really appreciate your advice

style="BACKGROUND-COLOR: #000000"David
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