Got my CV 50/2.5 today. Now I'm really in the SWMBO doghouse. I had to borrow money from the savings account to get the 50 & the M-Rokkor 90 I got the other day. Now I really need to sell some stuff after Christmas. Bye bye dslr & lenses! Anyway, here's the CV lineup as it sits at the moment. From left to right- 15/21/35/50. The gap in the middle is for the 28/3.5 that I don't have yet. It's is even shorter than the 21 or 35. They are fairly rare, but I will find one eventually. Also missing is the 12/5.6, but that's farther out. They made a 25/4, but the overlap is too close. Might get one later just so I can have the whole set, but probably not. Eh, it could make the meat in a 3 lens set for lightweight travel maybe- 12/25/50. [shrug] I should have stuck the Tak 55/1.8 in there for scale, but I forgot. So why did I decide to go with all Leica Thread Mount Cosina Voigtlander rangefinder lenses? Well, size- they aren't very big. Commonality- all 4 of these lenses share the same lens cap (as does the 28). Except the 15, they all take the same size filter. Except the 15 they all use the same size hood. They all work the same way- the aperture and focus rings rotate the same way on the whole series. Are there better lenses out there? Absolutely. But these have enough image quality for what I need and they don't overwhelm the camera when they are mounted. For me they are the right choice, ymmv.