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Photography Question 
Emmett S. Speelman
BetterPhoto Member Since: 7/26/2005
 

2x tele converters


As I am yet able to purchase the new lens that want do to Money, I was interested in a 2x tele converter to increase the focal lentgh of the lens I have until I can get my new lens. What are the pro and cons if any?


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4/17/2006 8:03:02 AM

 
Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
gregorylagrange.org
  Save weight, save money, save room in bag, keep same minimum focus distance so it's like having a macro, become a quick change artist cause you can focus while holding onto the converter so it's like carrying two teles around at the same time.
Loose two f/stops, may loose autofocus if you use that, loose contrast(good ones only slightly, depending on conditions may not even notice) and sharpness(good ones, apply the same), never as good as a true tele of the same focal length.


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4/17/2006 8:17:22 AM

 
Christopher A. Vedros
BetterPhoto Member Since: 3/14/2005
  Emmett,
I agree with all of Gregory's comments above.

What is your current lens? Both Canon and Sigma state that their teleconverters will ONLY work with a certain list of lenses. I'm not sure about other third party teleconverters.

You should check to see if your lens will work with whatever teleconverter you are considering.

Chris


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4/17/2006 10:43:07 AM

 
Gregory LaGrange
BetterPhoto Member Since: 11/11/2003
gregorylagrange.org
  Lose the O, let it loose cause lose has only one.


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4/17/2006 4:26:25 PM

 
Bob Cammarata
BetterPhoto Member Since: 7/17/2003
  Also, consider that camera-shake and/or subject movement will be doubled with the converter so a solid support system will be essential... especially when used in conjunction with a tele-photo or close-focusing lens.

I would personally steer clear of third-party teleconverters. The image quality achieved with matched brands will be superior.


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4/17/2006 6:48:07 PM

 
John G. Clifford Jr
BetterPhoto Member Since: 8/18/2005
  I have a Sigma TC14 1.4x teleconverter that I use with my Sigma 70-200/2.8 EX lens.

I lose one stop, giving me a 98-280/4 lens. It still works great... and dropping to f/5.6 or f/8 (one or two stops) makes it even sharper.

A good teleconverter attached to a good lens is well worth it. However, a good TC on a so-so lens won't be that great, and a so-so TC is an abomination.

What lens do you have? If it has a maximum aperture of f/4 or smaller, then I wouldn't go with more than a 1.4x TC (and the one-stop loss). If it is f/2.8 or lower, then you can get away with a 2x TC.

Note that 1.4x TCs tend to be a bit better optically since there's less between the lens and the camera than with 2x TCs. Remember also that you can't get something for nothing, so don't expect the same performance out of a lens with TC that you'd get out of a better-grade lens with a longer focal length.


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4/17/2006 7:24:05 PM

 
Samuel Smith
BetterPhoto Member Since: 1/21/2004
  thanks for catching that gregory,my mind was swimming a bit.
sam


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4/17/2006 7:37:02 PM

 
Emmett S. Speelman
BetterPhoto Member Since: 7/26/2005
  Thanks Folks! for all the help, I shot a Minolta 7d and also shot manually, so I just ordered a sima 2x converter. I have an older sigma 70-200mm and I under stand that this may or maynot work but I can return it. The lens I am looking at to get is the new Sigma 50-500mm apo Just cant afford it yet.


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4/18/2006 4:06:05 AM

 
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