Well now I have more than one lens I kinda want to change lens more frequently and usually outdoor too so I am wondering if there is anything I should worry about or be careful with while changing lenses outdoor other than avoid doing that when it's windy. I know those pros do that all the time but they also pay hundreds of dollars every year to have their equipment cleaned. I know my camera has dust reduction function but I've heard it's not very effective. Any kind of advice or information would be appreciated

I will keep my ears open as well. I also change lenses all the time. I need one more camera!

hahaha! Well I wouldn't mind getting a 50D too if it doesn't have worse high ISO performance than 40D
Why on earth should I keep my ears open while changing lenses?

I will get a 50D as well, if I should buy a new one right now.

Haha. I will LISTEN to the advises people are going to post here. xD

hmm I don't quite understand...
So you want to upgrade to a 50D? I think the only real improvement it has over 40D is the VGA lcd screen because the lcd on 40D is pure crap especially in bright daylight.

50D has the Digic 4. And 5MP more. I like to get my photos LARGE on the wall.

I think you really should read some of the reviews first especially about the HUGE megapixel gain. It's more of a downside than a good thing...
Believe me I did some research before I bought my second 40D

From Dpreview.com:


http://www.dpreview.com/reviews/canoneos50d/

http://www.the-digital-picture.com/Reviews/Canon-EOS-50D-Digital-SLR-Camera-Review.aspx
If you scroll down a lil bit you will see the difference in high ISO performance between 40D and 50D

You will need some very sharp and expensive lenses for that camera...



This post was edited by Futurama on May 11 2009 03:13pm

Keep the camera point towards the ground when you do it and cover up your lens as soon as you take it off..

I change my all the time outdoors.
There are just a few things to keep in mind, as it could be harmful: (I have learned thus from numerous photographers in the past)

1: NEVER have the camera turned on when taking a lens off. When it is on, electricity running through the censor will ALWAYS attract dust. ALWAYS.
2: Keep the camera facing the ground, thus making it harder for dust to blow UP and IN.
3: Do it fast. Leaving it bare for more than a minute is just asking for dust.
4: If it's possible, do it indoors or a place with less dust. (Bathrooms are often the best place, that I know of.)


After you put the news lens on, go into the menu and do a censor leaning in there (if your camera has it) I know mine does.

I do this all the time ... and living in Seattle we often have rain, wind and everything else.

1) Don't hold your camera facing up ... seagulls might be attracted to the reflection that the pentaprism makes and try to shit in your camera.
2) Hold it downward if you can maneuver it.
3) Sit down so you aren't juggling lenses or place your bag on the ground and kneel down next to it.
4) Kind of bend over your lens so that you body blocks rainfall and hold the camera in close.
5) Get really good at changing your lenses inside, under normal conditions so that you can do it with your eyes closed. This helps do it quicker in the field.
6) If in the city, curl over the camera and lean against the wall with your body shielding the wind. If in nature, lean against a tree, cover it as described by your body for things that may fall, and shield yourself from wind.

That's my advice. I've never had a problem changing lenses and I have been in horrific weather. About the only place I wouldn't change a lens is in a desert storm with lots of wind/dust.