Originally posted by Rico Max are you getting an adapter ring for the Canon or your LX or both?
And Yes those Tak's are a treat to focus. In modern lenses Pentax still excels for manual focus. The 43 31 and 77 LTD's are superb manual focus lenses. They even have an aperture ring. The even more modern DA 21 40 70 LTD's are great manual focus lenses as well. They have a great quickshift feature that allows manual focus even when autofocus is engaged.
One thing though please don't let us know if you do get a wonderful lens like the A50 f1.2 or the A15 f3.5 that you hack the mount to fit on your Canon.
Right now I am waiting for the M42 ring for the Canon. I might later get the ring for the bayonet mount Pentax as well.
One of the interesting things about the Canon EOS mount is its short flange to focal plane distance. Its shorter than most manufacturers which means that its possible to mount adapters and use many lenses, new and old from other brands. Its not nearly as doable on a Nikon. A lot of camera tinkerers choose the Canon platform for this very reason. A lot of people, me included, think that the Canon wide angles do not perform as well as they should. Its becoming very popular to mount the new Nikon 14-24 G lens onto the Canon. Same thing with some Zeiss, Contax, Olympus, Pentax and Minolta glass. Part of the recent trend for the price surge on specific classic lenses is coming from the emerging interest from Canon users. One of the most sought after lenses is the Rokkor 58mm/1.2 lens which has tripled in value recently, if you can find one...
I use the 5D. Some 5D bodies will need extra work to mount other lenses. This can include slightly shaving the bottom of the mirror and modifying the rear of the "alternative" lens being mounted. I hate to say it but some Canon users will take a Pentax K lens and snip off the the rear aperture lever - the so-called aperture leverectomy. Doing so will prevent the protruding lever from hitting the Canon mirror.
So, after thinking about this and the higher than expected prices on the 50/1.2 I decided to go with the 1.4 Tak instead: no aperture lever. Snipping off the lever on the 50/1.2 will reduce the resale value of the lens. But the adapter ring for the Tak is a simple screw on - screw off affair with no harm done.