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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Jan 2006 (Monday) 08:33
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Advice Required on Sigma 50-500 APO DG with TC

 
rakesh
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Location: Bangalore, India
     
Jan 23, 2006 08:33 |  #1

HI

I'm planning to buy Sigma (Bigma) 50-500 APo DG Lens for my Canon 20D and also want to use 2X Teleconverter. In this respect I need your expert advice on following :

1. Whether the 2X TC works perfectly with 50-500 ?
2. I heard that anyone can get AF with this Lens while using TC. How it can be achieved ?
3. Which Brand and Model works perfectly with Sigma 50-500 APO DG on Canon Mount.
4. How much this combination will cost ?
5. If tripod is required then Which brand and model works perfectly with above combination?

I look forward to all of you experts advice.

Regards

Rakesh Gupta


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Jon
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Jan 23, 2006 10:08 |  #2

Checked out Teleconverters Demystified in the EF Lens FAQ Sticky?. Sigma's TCs work only down to 100 mm on the 50-500. Canon's will, at best, do the same. Tamron's or Kenko's should (because they're markedly different in design) function throughout the range.

Some, less expensive (hence poorer quality), TCs will pass through the original lens aperture information instead of reporting the true aperture; These will allow the camera/TC/lens combo to AF, but it's likely to be slow. There's also a trick of taping over 3 of the TCs contacts, but that can lead to the lens hunting, with potential to burn out the AF motor.

3) Perfectly? All teleconverters degrade the image to an extent. 2x TCs are noticeably worse than 1.4x TCs at that.

4) Depends on where you buy from,and what duty and taxes get slapped on at the border if you buy from outside India.

5) Brands & models are pretty much an individual preference, depending on how heavy you're willing to let it be and how much you want to pay. You need one (and head to match) that'll take at least an 11 lb. camera/lens combo. Personally, I use a Manfrotto carbon-fiber with the 486RC2 or 488 RC2 as my tripod (Canon 100-400 IS, not the Bigma).


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cfcRebel
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Jan 23, 2006 10:14 |  #3

rakesh wrote:
HI

I'm planning to buy Sigma (Bigma) 50-500 APo DG Lens for my Canon 20D and also want to use 2X Teleconverter. In this respect I need your expert advice on following :

1. Whether the 2X TC works perfectly with 50-500 ?
2. I heard that anyone can get AF with this Lens while using TC. How it can be achieved ?
3. Which Brand and Model works perfectly with Sigma 50-500 APO DG on Canon Mount.
4. How much this combination will cost ?
5. If tripod is required then Which brand and model works perfectly with above combination?

I look forward to all of you experts advice.

Regards

Rakesh Gupta

Hi Rakesh,

1. Depends on what you mean by "works perfectly". If you mean stacking the 2XTC on the Bigma, snap a picture and the picture comes out. Then the answer is "yes". If "works perfectly" means AF still works, can still get great image quality, then the answer is "no". :)

2. Technically it's doable but i would say don't even bother because it requires a lot of light and a very contrasy subject/background. Even with that it hunts a lot and you will lose the opportunity if you are shooting wildlife or sport. You can achieve the AF by using an older version of Sigma 1.4TC like mine. Or, tape three of the eight pins if you use the newer TC. I think 2xTC definitely requires MF but i don't have one to try.

3. I have a Sigma 1.4TC that works, and have seen a Tamron 1.4TC that works great too.

4. I bought my TC used on eBay. Costs me US$70.

5. IMHO, tripod/monopod is required regardless if TC is used or not. At 500mm, it's difficult to shoot handheld. It's not impossible. It's just the number of keepers is rather low. I use a Dynatran CF tripod.

Hope that helps.


Fee

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Advice Required on Sigma 50-500 APO DG with TC
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