At 07:42 PM 04/18/2001, you wrote:
>  If the magnification of 100mm macro lens
>is 1:1 then how big it is on my 28-90 USM lens?

For the 28-90mm f/4-5.6 USM EF it's 1:3.3 & the near focus distance is 1.25 
ft., per Canon USA specs.
--
regards,
Henry Posner
Director of Sales and Training
B&H Photo-Video, and Pro-Audio Inc.
http://www.bhphotovideo.com

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