Just for info, I have a reversing ring, I got it off ebay (less than $20 CDN including postage) it is possible to do some really good shots with it, I found my results varied and focusing wasn't easy. Now it just sits there doing nothing, they are stiff to get on and off and I am not sure if exposing the contacts to the elements is a good thing
Yah that was one of the 1st things I thought about, exposing the end of the lens to the elements, Im always in such a heated hurry to switch lenses as fast as possible to keep dust ant things out. You think you might be able to post a link to some of the pictures you took with it the adapter?
I forgot one other peice, the mount adapter, so add another $10. With shipping, you should be well under $50.
I'd go with an m42 lens if I were you. Something in the 50-58mm range. I might look at a Helios 44 or a Pentax m42 55mm. The Industar 50mm f3.5 is pretty good and cheap, but won't double as a fast prime. Add some manual canon tubes and an m42 adapter and you are set. Using it without the tubes gets you a nice MF lens and using it with the tubes gets you some ultra-macro. You may even sell your 50mm 1.8 once you find out that the old lenses are actually a bit nicer and focus just as accurately!
Ok you got my full attention now! I think that 50 1.8 is the best lens I got for low light, All the pics I have taken with it have been so very crisp and the bokeh is instant! And when I record videos and use the manual focus to focus between the foreground and background it great. So what are you saying is better then that lens? I have not heard of a m42 or Helios, I have heard of Pentax, and I just googled the pentax, so these are old school macro lenses with big apetures or what?