Once in awhile, I read from here, flickr or some other sites mentioned about how good the old lenses were. They build like a tank and have excellent optical performance. And of course, they are usually not too expensive. After I did some searching on the subject, it seems like (I could be wrong because I really do not know too much about the older lens) the screw mount M42 was quite popular since I found a lot of brands made lens with that mount. Since I have a Canon body, so I found there are M42 adapters out there for EOS cameras. Of course, I believe I need to manual focus the lens with the adapter. But someone mentioned there are M42 to EOS adapters that allow Focus Confirmation. Is anyone here try a M42 mount lens on a Canon body with the adapter? Do you like it? Anyone know a site that has a lot of information regarding those adapters? I am interested in finding a good old macro lens with a adapter now. Or maybe a good fast prime lens. Beside the M42 mount, any other one I should also look at? I understand that a lot of newer lenses are technically better in terms of auto focusing. However, in some situations, I really do not mind using manual focus if I can get the same end result and save some money. Especially for the macro prime lens or a REAL FAST prime. Prime lens wise, currently, I have a EF 50mm F/1.8 mk1, Tamrom 14mm F/2.8 and a EF 85mm F/1.8 USM <- just ordered it couple days ago. And I would like to have a 100mm or 135mm fast macro lens and in the future, maybe a 200mm or 300mm fast telephoto lens. Or, I should just forget about the old lenses out there.