[cwilk]

Hi all,

Thanks so much for all the replies, the forum is a veritable mine of expertise!

So, as far as I understand, if I used the cheapo ones then I would have to use the camera on fully manual and manually set the focus, speed and aperture. TBH, this doesnt bother me too much as I've used a fully manual camera before (VERY old slr with discontinued batteries!) I tend to do close ups when pottering round the garden looking at flowers and the instant feedback provided by digital cameras certainly speeds the learning curve.

Blackbrook - only being able to use a very wide aperture is a bit more of an alarming prospect. Would this happen even on manual, do you know? For example, if I set the aperture to f8 before fitting the tubes, would it remainat f8, or would it default to the widest aperture? (excuse my terminology, I get terribly mixed up with stopping down or up so I tend to think of it as wider or narrower).

many thanks.