Elvis, welcome to the Forum.
On the assumption you know nothing (forgive me if this is incorrect), you first need to obtain a 50-75 LTM to bayonet adaptor for your lens. Thees are readily available on e-bay and will allow the screw thread lens to be used on the bayonet camera. It will also bring up the correct frame lines in the viewfinder allowing you to accurately compose the image. If possible I would get one that has the coding insets machined into the rim. Otherwise, dots you add will ultimately rub off as you change lenses. Just use a black permanent marker to fill in the appropriate code as per the link above ie. use a Summarit 75 for your Voigtlander 75 lens (don't worry about the white ones just leave these as silver and it should still work). Don't forget to switch on auto lens detection in the M8 menu.
If all goes well you should get the correct frame lines and the camera will make some corrections to the image as it is captured and processed. It will also record the lens identification in the Exif date of the image that programs like Lightroom and Aperture can read. Note this will be Summarit 75 not Voigtlander 75 as Leica does not produce 6 bit codes for other manufactures lenses.
Having said all of this the only thing you really need is the adaptor and the camera and lens will still produce very acceptable results without 6 bit coding.
Hope this is helpful and I look forward to seeing some of the pictures your new camera and lens produces.
Wow, Bob! Such an extremely full answer! First of all - thank you for the "Welcom" greeting. Second: honestly you were a little bit wrong about my knowledge according to the Leica) I have it already around month - no to much, but long enough to know already 99% information from your answer. Only one thing, that I was not sure - is the type of the marker, what I need to use for the coding) But really appreciated for you helpful answer!
BTW: Just pick up my NEW Color Heliar (probably the last new lens in my country) and found really BIG surprise: internet shop, where I bought a lens add for free original Voigtlander M-adapter and original (!!!) Voigtlander external viewfinder with 75mm frames, that is really strange, cause the price of this set on B&H is more than 1\3 part of price Color Heliar :confused:
Tomorrow I'm gonna try to make a test of this lens, if the weather gonna be good enough.
BTW: as I found from a quick test shots - the Voightlander external viewfinder 75th frames doesn't give exact picture if I'm using it during the shot. Probably need some more practice?
Edited by elvispreasley, 12 December 2012 - 19:43.