Voigtlander finder with Zeiss lens on a M4

Hi everybody

I want to buy a wide angle lens, a Zeiss 25mm/2.8 Biogon T ZM. The price of the Voigtlander finder 21/25 is cheaper than the Zeiss finder. Is it a good idea to use the Voigtlander finder with this Zeiss lens? What about the 24 mm Elmarit whit this finder even there is a small difference? Which lens is the best, Elmarit,Biogon or the
25/4 Color-Skopar for you?

If you're looking for an inexpensive finder, there were aftermarket Japanese finders made in the 1960s for that focal length. I have a Petri finder, which cost me only a few dollars. Keep an eye on eBay -- various viewfinder show up frequently.