Re: Maximum Extension Tube Length

[tom]

> Shel Belinkoff wrote:
> >
> > Is there any theoretical or practical limit to the length of
> > extension tubes?  Could a 150mm - 200mm length be used with a
> > 200mm macro lens without any image degradtion?
> > ...
> 

Hi Shel.

My experiments in this area showed that performance of many lenses not
designed for macro use did well with lots of tubes and reversing of
lenses. I was surprised. I would be surprised if this particular lens
wasn't good with that much extension, though there would probably be
*some* degradation...depends on your standards on whether it would be
too much.

I think your best plan would be to just test it.

tv
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