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| p.1 #11 · canon shooters : macro lens options at weddings... |
diggler, do you use the 12 or 25 extension tube with the 85? does the extension tube change the focal length, or just the close focus distance?
Extension tubes don't change focal length, they are empty tubes that move the lens further from the sensor to change the focus range. Keep in mind when using extension tubes you can only focus close up, so the lens will be a one trick pony with the extension tube on.
The shorter the lens the less extension you need, a 12mm tube on a 50mm lens will get you very close focus. Generally speaking I'm more inclined to use a 12mm than a 20mm for up to 85mm lenses.
Check out the Kenko extension tube sets, since there are no optics involved going third party is a good alternative to the more expensive Canon brands. I believe you get a 12mm, 20mm and 36mm tube for around $180.