which MD to Sony adapter

I have done something similar by purchasing an MD 100mm f4 Macro lens, and using an adapter without glass, which acts as a short extension ring as well, increasing magnification slightly. So I have no infinity focus. But lets me get into macro photography cheaply. I am a little confused by your MD 135 Macro lens though - not listed amongs Macro MD lenses on sites I have looked at. Is it possible it is designed to be used only with macro-bellows? Maybe somebody else will know. If that is the case, I can't see that adding a glassless adapter to bellows would present an issue.

Hi
I bought a "glassed" adaptor for my old Canon FD lenses to fit my Sonys & the 50mm 1.8 lens (which was very good in its day) gives lovely results. I haven't got access to my photos at present but if you would like me to post some samples later please let me know.
When I say 'lovely' - I haven't gone rooting around the corners at 100% but certainly the sharpness & rendition is perfectly OK for all normal purposes.
I used - and have again - a company on ebay called Roxen who seem very efficient and well priced - not always the cheapest but close enough, better delivery times than some sellers.
Hope this helps & Good luck
RT