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General Lens ZOOM question....

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Old June 30th 04, 10:07 PM
Tony Spadaro
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Default General Lens ZOOM question....

George is, of course, lying. He owns no camera, has no students, has never
tested anything, and is full of shirt.

home of The Camera-ist's Manifesto
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"Giorgio Preddio" wrote in message
"Tony Spadaro" wrote in message


In general there is a 10% fudge factor on lenses. (ie anything between
270 and 330 would be a 300, but believe me now one ever called a 325mm

300. It could be that for these "super" zooms, a lot of the range has

to do with advertising than fact. I would say that if you need a 1.4 TC

get 300mms out of it, it's a good lens to send back.

Surely 300mm is 300mm no matter what make of lens..... ?

You will find that the Sigma lenses are the most accurate in terms of
focal length accuracy. I conducted some very thorough testing in this
area last year. My photography students learned quite a bit from the
study. Unfortunately, my sponsors prevented me from publishing the
results due to corporate politics.


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