The very honest eBay seller from whom I ordered the FD 50mm lens has contacted me to inform me that this lens may not be the best for reverse macro..... Apparently you cannot manually set the aperture unless the lens is mated to a body.
I have since Google'd that I should be able to make it work by fashioning a 'macro hood' from the rear lens cap, essentially by cutting a hole in it!
I have no experience - as may now be apparent - of old manual lenses, and thought this would be a straightforward case of choosing the aperture via the ring on the lens.... seems I've missed the bit about 'stopping down'.
Help guys (and gals). Is this going to work, or do I look for a different lens?