Teleconverter for Digital???
- This topic has 3 replies, 3 voices, and was last updated Jun 25, 2007 at 1:04 am by
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Mike:
The teleconverter is actual lens magnification through more pieces of glass. The FOV crop is simply a crop of the angle of view of the lens. So you are getting 450mm cropped 1.5x.
The angle of view I suppose would be the same as a 675mm, but the image will not contain as much information as a lens in that caliber. Anybody else have info or correction on this?
Mike:
The teleconverter is actual lens magnification through more pieces of glass. The FOV crop is simply a crop of the angle of view of the lens. So you are getting 450mm cropped 1.5x.
Totally agree.
Mike:
The teleconverter is actual lens magnification through more pieces of glass. The FOV crop is simply a crop of the angle of view of the lens. So you are getting 450mm cropped 1.5x.
Totally agree. I was just hypothesising whether or not a teleconverter added to a DSLR with an existing FOV crop of 1.5x might compound that to a 3.0x crop. I assume image acuity would be some-what crappy. Sort-of a “Poor Man’s” super zoom…
Dont know if I can answer all your questions but I can tell you a 1.4 will work. You may (probably) have trouble with AF and Im guesing you’ll definately notice some loss of IQ but they can work. I use a Tamron 1.4x non reporting TC on both my 180 f3.5 macro and on my 400mm f5.6 with a Canon 30D( 1.6 crop).
IQ is fine imo. 400 L f5.6 + tamron 1.4 on 1.6 crop
When used with a high quality zoom ( Canons 100-400L to be exact) though I didnt like the loss of IQ at all and consider it un-useable. With my primes though IQ is ok, what troubles me is AF, its spotty. Anways the resulting IQ will imo, be almost entirely dependant on the quality of the lens its being used with, not the body.
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