Is there a reverse lens adapter for the EOS out there? I know about
the Novoflex one... but it´s a little bit expensive I think...
I don´t mind if it´s non-electric...
If it's not the electronic Novaflex and assuming you wish to use an
EF lens, how do you plan to stop it down?
Or do you plan to use a manual lens of some kind?
I reversed a 28mm manual Hanimex by epoxying it to a body cap.
This lens has a 49mm filter thread and this worked out well, as it
would fit in the groove that runs around the body cap and this made
for easy centering and glueing.
It doesn't do a bad macro either, for a "rainy day with nothing to
do" project lens.