@ Mauxie no problem il try and keep them as simple as possible !! Glad you enjoy the thread!
@ Flutterby, having a lens with no IS is not a problem at all! like i said i have a 400 f5.6 with no IS and i absolutely love it!! I did read up on tips with lenses that have no IS and came across this information:
in my terms : When Using a lens make sure that the shutter speed is the same or higher than the actual distance you are using. Especially when using one with no IS or OS
When using the lens hand held:
For example Ill use your lens flutterby : you have a 75-300 non IS. Now lets say you taking a shot of a bird in the garden and u zoomed up to your 300. You should make sure that your shutter speed is the same or higher ( the higher the better, but do not go to high with your ISO to make your shutter speed high) then 300. I go to around 400 ISO when taking photos to ensure that my photos are crisp and the action is frozen in time BUT remember the lower the ISO the better (less noise on your picture)
So if you shooting something at 300 distance and your shutter speed is 250 the photo is not the one you will be looking at very much !!
This is very helpfull if you using a large zoom lens like the 150-500mm sigma lens. If you zoomed out at 500 try and get your shutter speed to 500 or more for pictures you will start liking
Have a great day Sunday! Im spending mine making a camera bag for my gear

trying to fit the following into one bag:
Canon 7d
Canon 450D
Canon 70-200 F4 IS + HOOD+ Canon soft cover bag
Canon 400 F5.6 L + Canon hard cover bag
Canon 50 mm F1.8 lens
Going to be fun
Enjoy
_________________
Canon 5D MK III

, Canon 7D , Canon 450D | Canon 400 F5.6
L | Canon 70-200 F2.8
L IS|Sigma 10-200 EX DG OS F4-5.6 & goodies
Runner up wildlife photographer of the year 2012-sunday times & winner-Canon S.A. reflection category