Sue,

If weight plays any role in your decision of which lens to buy, Canon  
has a 70-300mm f/4.5-5.6 DO IS lens which weighs about half  as much  
as the 100-400 (1.6 lb vs 3 lbs, according to the specs on the B&H  
site). I like it very much, although of course 300mm is limiting for  
small birds (but if I had a 400 I'm sure I would want a 500 or  
600...). For macro, the 100 mm f2.8 is very good in my opinion.

Evelyn Ralston
Bethesda, MD




On Aug 3, 2007, at 11:44 AM, GREG FUTRAL wrote:

> Canon changed their lens mount in 1987 with their introduction of  
> the EOS (autofocus) product line.  So long as you have a Canon lens  
> with an EOS mount, you will be fine.  The only problem that I  
> encountered is that my third party lenses from Sigma from 10 and 15  
> years ago do not work with the Canon digital bodies, but they do  
> fit, and will work with my film camera bodies.
>
> Greg Futral
> Baltimore, MD
> 
>
>
>>> Fran's comment on age of lens also applies to Canon.
>>
>> George
>>
>
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