25 mm Extension tube - how too use it right ?

I have just got me a 25 mm extension tube - thought i would try some close up photos - at least try
What lense ( of the one below in my sign) would be the best ?
Is there a spesial way of doing this ?
Sorry for dumb questions - but i have never tried "macro work" ever.

Try stack the 25mm tube on your 85mm f1.8. Switch the lens to MF and then test it on a dollar bill or a coin. Move the lens as close as possible to the subject and see what that gives you. Of course, preferably with tripod and cable release.
Then stack the tube on your 70-200f4L and go out to your garden. Find some bug/bee/butterfly that is cooperative, zoom your lens all the way to 200mm (remember to MF instead of AF). Move the lens closer/away until your subject fill the frame.

Post some photos after your experiment .
Some of the samples i did with my Bigma + tubes.

Thanx a lot cfcRebel
I will follow your advice.
Will have time this weekend too try it out . Promise too post nxt week
Thanx

An extension tube has greatest effect with a shorter lens, in terms of getting you closest to the subject...a 25mm tube on 50mm is adding a lessened ratio of
[tube extension] : [focal length]
25 : 50 = 1:2
25 : 100 = 1:4

For example, 50mm tube with 50mm lens can get you a 1:1 magnfication image on the film/sensor.

Added to the 25mm, it can give you macro magnification; added to 100m, it can merely get the lens to focus closer than without the tube, but not necessarily macro magnification. For example, I use 25mm tube with my 150mm lens on my medium format camera, to shoot headshots of models and actors/actresses.

It'll work well with all your lenses really,. I'd try 85mm and 70-200mm first. The zoom does not have the closest focus distance, so might not offer the highest magnification of your options, but I do like working with the 70-200mm's and tubes because of the flexibility in magnification acieved by merely adjusting the zoom.