Extension tubes??

Where can I get some extension tubes for my K20d?
I have looked on SRS and googled and found not a lot. Amazon had some at around £7 and another set at over £800. I was kind of thinkingin between these 2 extremes. Don't kenko make a decent set?

It depends whether you want them to have contacts so that you can aperture control from the camera body (more expensive) or 'dumb' tubes (which can be very cheap). The earlier post from today looks like a promising candidate for the former... link

Cheers

Hi Matt

I want them for macro work with longer lenses (say 300mm) I guess I need the aperture control.