What's the difference between a silver and a black Jupiter-8 lens?

I'm totally new to Russian lenses but am thinking of trying one and am considering either the jupiter-8 50mm f/2 or the jupiter-9 85mm f/2. The jupiter-8 is cheaper and more affordable for me but not sure the difference between the black version and the silver version. I know the black one is newer but which one should I get if I prefer easy and smooth focusing mainly for everyday video?

Another thing is, is there different versions too for the jupiter-9 just like the 8? Cause I already have a nikon 50mm 1.4 and I think at least focal length wise, a 85mm makes more sense to get then another 50mm. But again, are there different versions and what are the difference?

And in general, which one, the jupiter-8 or jupiter-9 is better? From a movie recording pov at least? Ease of use, bang for the buck, quality, fun to use, etc? Or any other suggestions as a russian lens starter?

Thanks!

Added (1). Thanks a lot for all the input!
Sorry but I forgot to add, I'm a Nikon user but just bought an NEX-5N for everyday video recording and point and shoot because of its compact and light weight. Hence I'm planning to try out some Russian lenses on the 5N as a starter. Don't think I'll bother buy an adaptor for my Nikon camera to use Russian lenses anyway. So the 5N will be the sole user. Would that make a difference?

Check the mounts. If I'm not mistaken, earlier silver ones are M39 while black ones are usually M42.

I have 3 Russian lenses. One is the 85mm Jupiter (black) which is amazing but I limit myself to using it with a tripod since it's too heavy to hold even with my small Pentax dSLR's. The other two are both 50mm from Industar, one is a "pancake" while the other is the macro version. If you want to try a cheaper Russian lens than a Jupiter, the Industar 50-2 "pancake" should be it. It's a bit clumsy to use but the very light weight would make you hang on to it a bit longer than you should.

The 85mm is a beautiful lense but be aware that it comes in at least 4 different mounts two of which are 39mm but incompatible with each other.
The easiest to adapt is the M42 version but I believe that optical elements are essential in the adaptor if you are fitting an M42 lense to a Nikon because the registration distance is very different. There are also L39 for 39mm mount Leica type Rangefinders and M39 made for the early Russian Zenit cameras. Lastly I have a Contax/Kiev fit bayonet mount version. The M39 Zenit fit lenses only need a thin 39-42mm adaptor ring to allow them to me used as M42 lenses. The registration distance is the same.
I have never seen an M42 silver version of the 85mm
The Jupiter-8 also comes in L39 or Kiev/Contax fittings but not in the M39 or M42 fittings.

The older Jupiter-8 lenses are finished in silver, and the newer ones are finished in black. There might be a few improvements in lens coatings with time, so the black ones are probably better. Other than that, they are the same, and there shouldn't be any real difference in focusing.

The colour doesn't have anything to do with the mount - I've seen both silver and black versions in M39 and M42 mount.

You can't directly compare Jupiter-8 and Jupiter-9 to say which is "better". They have different focal lengths and different purposes. I'd both are quite good for video, because they have a continuously-variable aperture (no click stops).

Having said that, if you are buying this for use on a DSLR, I wouldn't bother. You'll get so much more out of the Jupiter lenses if you use them on a Russian rangefinder like a Zorki, like they were intended.

Have fun!

I have a Jupiter 9 and Jupiter 37A in black and they are M42 mount.

I also have an old Jupiter 3 in silver that's M39 mount.

Yes, older Jupiters are generally silver, usually 1960's and earlier. If you already have a 50mm lens, I'd get the Jupiter 9.It's a great lens with a lot of character. If you still want a 50mm lens, get a Jupiter 3 instead. It's f1.5. Flares more easily, but it'll probably be sharper at f2.0.

EDIT:

I did a quick search on amazon.com and found plenty of m42 to Sony NEX adapters and m39 to Sony NEX adapters. You should be fine with adapting most Jupiter lenses, as they are mostly m42 and m39 mounts. I don't know, however, the metering capabilities of a NEX 5 camera with a manual lens attached. What I'd do is take a carefully cut piece of clear thin scotch tape, and tape over the terminals of a NEX lens, attach it, and see what you can do when using video with a lens the camera can't recognize (autofocus lenses with no external f-ring either close up to max aperture, or widest aperture when unrecognized by the camera). Walk through a location with various light values while filming to see how accurately you can meter your video before considering a manual lens for video on your NEX camera.

Have fun