I just ordered a 20D. While reviewing the specs on the Canon site I
noticed the operating temperature is rated 32 to 104 degrees F (0 to
40 degrees C). My thoughts were that the lower limit was related to
battery or LCD performance.
Those are just CYA figures I'm sure... I used my 20D over the winter in
Death Valley during the worst storm in 100 years... and it didn't fail
on one shot (even when I got broadsided with a snowball that just
clipped my face and lens!). And I took my 10D to Zion Canyon over the
summer where daily temps were near 120 in places - certainly the black
surface of the camera.
I find if you take reasonable precautions - avoid sharp changes in
temp, no harsh direct sun or direct cold (leaving the camera on an ice
block) it'll perform just fine, aside from battery problems. Even then,
with two of the BP511 batteries in my grip I can shoot hundreds of
shots in snow conditions.
In really bad weather I always keep a wrap handy to cover the camera...
I don't know what they're called but I've always used these soft square
wraps with velcro on the four corners - water resistant, heavy enough
to provide some padding, etc. Very handy.
And yes, I've had to clean my sensors. I'm only just recently getting
really comfortable with the process - it's actually quite easy, just
nerve wracking the first few times. I use PecPads and Eclipse fluid
with a soft rubber swab stick. One or two swipes across the sensor and
I'm set! I've also noticed you get much less dust on the sensor if you
remember to turn the camera off when you change lens (when I'm in bad
conditions I bring two bodies - my 10D and 20D) so I don't have to
change lenses as much.
-R
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