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Why use a lens extender?
Old 03-31-2007, 05:29 PM   #1 (permalink)
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I have noticed that some glamour photographers have used 1.4x or 2.0x lens extenders. Is there any advantage to using an extender? My understanding is that the image quality would be degraded by that factor of magnification. Just wondering...

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Re: Why use a lens extender?
Old 03-31-2007, 05:55 PM   #2 (permalink)
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Quote:
Originally Posted by dighost View Post
I have noticed that some glamour photographers have used 1.4x or 2.0x lens extenders. Is there any advantage to using an extender? My understanding is that the image quality would be degraded by that factor of magnification. Just wondering...

Thanks!
One import reason for using an extender is to avoid the high cost of buying another lens to cover the additional range. I use the Sigma 70-200 F2.8 all the time. That makes it like a 112-320mm on the Canon 20D. Suppose I wanted to shoot something occasionally that needed a 400mm lens. Then rather than buying a whole new lens, I could spend much less money to buy the 1.4x device. Naturally it will not longer allow me to shoot at f2.8, but that will be the biggest drawback. The quality of many of these 1.4 and 2.x items is such that there is little degradation of the image (at least that's what I've found in my use of such devices). Now if you ask this same question at a salesman at a camera shop, they may give you a different answer (why do you think they might do that?).
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Re: Why use a lens extender?
Old 03-31-2007, 07:17 PM   #3 (permalink)
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This was done on a d100 with older sigma 70-210 2.8 lens w/ $100 quantaray 2x converter.. somewhat equal in focal length to a 630mm lens and even at that I needed to crop in alot.. I want to get a kenko 3x $150 (hoya glass )
that used with my 70-210 would give me 210-630 F8 lens plus 1.5 crop factor
= 315 - 945 F8 )
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Re: Why use a lens extender?
Old 04-01-2007, 09:40 PM   #4 (permalink)
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The answers make perfect sense, and thank you for the explanation. I was at a local camera shop looking at some prime lenses and the sales guy was talking about extenders with another customer-- which got me to thinking about it. I have pretty nice 50mm and may give it a try some time...
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Re: Why use a lens extender?
Old 04-01-2007, 11:58 PM   #5 (permalink)
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Check the specs on any TC before you buy, especially for use on a 50mm lens. My Kenko 300 Pro 1.4x will NOT work on a lens set at 50 mm. You'll also need to note that some TC's will lose autofocus and metering ability with certain lens combinations.
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