hello. I was a kiev 4 lover user and now i bought a canon 7. With the kiev i use the helios 103, a incredible lens, my all time fav lens. Now i want to try the canon 7 because is more realible and have ha bright and large viewfinder. I saw on google some contax / ltm adapter with numbers fore zone focusing too. someone have one or tried one? With this adapter can i use my helios in my canon 7 and and focusing with rangefinder?