Help needed with extension tubes.

Started Aug 20, 2005 | Discussions thread
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Dieni Contributing Member • Posts: 541
Help needed with extension tubes.

I love to do macro work and at the moment my kit is formed from my DS + Tamron AF SP 90mm F2.5 + Vivitar Extension Tube Set + Sigma EF 500 DG Super + Stofen Diffuser.

Now the problem is that the lens is only capable of 1:2 magnification and to get to 1:1 I need to use the tubes. The tubes I have are full manual operation and I would like to get at least a set with automatic aperture and if possible autofocus too (bad eye sight).

So what length of tube would I need to get to 1:1 magnification with my lens? Cause I was going to buy a cheap AF teleconverter, remove the inner glass and use it as a tube or else I have found a 25mm AF extension tube which isnt so expensive either.

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