>
> This brings up the question, what does IS and USM stand for?
>
IS stands for Image Stabilizing which Canon has a lion's share in terms of
how many lenses in their line up with this technology, in comparison Nikon
has but only one high end zoom lens with this technology and it took almost
a year after announcing the lens is available before the average consumer
was able to actually buy one recently. No other brands of SLR (or medium
format camera) has this technology.
USM stands for Ultra Sonic Motor, it is a technology that combines fast and
quiet autofocusing mechanism, Nikon has theirs equivalent also, but again
only in their very high end lenses.
I think you need to pick up lots of sales literature from all the brands of
cameras you are considering buying and do some homework first, because as
much as the list members are all very helpful (you will see a number of
replies to this question of yours), we can not decide which brand of camera
you should buy into, YOU will have to make that decision for yourself based
on your personal requirement.
This is in one sense a challenging decision, but you will find the amount of
knowledge you gained from this process invaluable, I know I did 5 years ago
when I moved into the auto focus domain, I spent 1 week going over the
technical details, decided on Canon, and never regret it.
Regards,
Ken
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