I agree that there are a lot of apparently snapshot quality
photographers with D30's on this forum. But that may not be bad if
they learn something about how to get good shots.
Photography is a combination of luck, ability to anticipate and see
a good opportunity and having the right equipment to capture that
image. Luck because sometimes it takes being in the right place at
the right time when you cannot predict when that will be. Ability
is the most critical and learnable aspect - knowing composition,
knowing and understanding the subject and/or the circumstances you
are in, and having lifetime experience doing photography that you
can call upon in each next circumstance. Finally having the
necessary equipment to get the shot - sometime an old Kodak box
camera may be enough, other times more sophisticated equipment.
This is where ability and equipment compliment each other.
In the shot below - which won Third Place in the International
Council of Airshows Annual Photo Contest this past year - I used a
Canon D30 with the 28-135 mm IS lens (not an L type). How did the
IS help? I was able to shoot a a lower shutter speed and therefore
get better depth of field and hence get better definition in the
smoke.
I was LUCKY to be in the right place in relation to the loop the
formation flew, ABLE to realize how well the blue aircraft would
show with the white smoke in the background rather than blue sky
and able to anticipate it was going to happen by virture of knowing
their aerobatic routine and having the right lens (EQUIPMENT) to
accomplish the goal of maximizing the depth of field I could get
with the IS and a slower shutter speed (about 1/80 of asecond when
the rule would be 1/focal length or 1/200))