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BEST 50 mm M42 Screw mount?

My favorite Pentax lens is the 55mm f/2. I think it was made in screw mount too. Absolutely beautiful lens. The 50mm f/1.4 is very nice too.
 

Same here.
 
I agree that the Taks are top of the line. I have a 55/1.4 Mamiya Sekor that gives the taks a run for the money.
 
The only "50" I used on my two H3v's was the 55f1.8 in both the Super-Tak and Super-Multi-Coated Tak versions. Almost bought the SMC Tak 55f1.8, but, decided against it, since the early Super-Tak lens was fine on my last H3v. I did consider getting a 50f1.4, but, since my second H3v came when I'd been mainly shooting Nikon, I figured it wasn't really worth it. If I come across a black SV and have enough cash to get it, I might pick up one with a -4 diopter, and equip it with a 50f1.4, 85f1.8, and one of the 35mm Tak's. Just to be able to relive my non-metered Pentax days, with a better fleshed-out kit.

Oh, and, yes, the 55f1.8 is a real nice lens. I would say that it's just as nice as the Nikkor-H 50f2, which means it's very contrasty and sharp with good bokeh.

-J
 
Another vote here for the Tak 50/1.4 -- just a brilliant lens. I will also add that the very inexpensive Helios 44-2 58mm/f2 preset lens is lots of fun for the money.
 

I've got to agree. I love my SMC F2. Wish I could put it on my Leica.
 
I have both the SMC Takumar 50mm 1.4 and the SMC Takumar 55mm 1.8. I prefer the latter, both because of the slightly longer focal length, and the fact that its micro-contrast is better than the 50mm.