On Wed, Jan 17, 2001 at 12:07:33PM -0500, F. Craig Callahan wrote:
>
>
> "Kotsinadelis, Peter (Peter)" wrote:
>
> > One nice thing to consider, an extention tube gets you closer
> > and with IS you can actually handhold the lens and get some nice
> > macro shots without a lot of setup. And for those worried about
> > AF, even with an Elan IIe and a 25mm extention tube, AF still works.
>
> It is likely that this is because the extension tubes don't "tell" the body
> about their presence the way the extenders do, so the AF system doesn't "know"
> that it's working at f/8 (at the long end). One question might be, how well does
> the AF work in this situation?
It doesn't. Not in any useful way, anyhow. Camera tries to focus but
generally doesn't succeed. I have used that very combo and I find it
usable with manual focus only.
Then again autofocus isn't all that useful in macro shots anyway,
and that setup is quite useful as a travel macro option -- the tube
is much lighter than any macro lens as an addition to the 28-135.
--
Tapani Tarvainen
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