Hello all...
I'm new to the forum and relatively new to photography. I've recently become interested in experimenting with inexpensive vintage lenses. I recently purchased a very nice Kenko fisheye conversion lens and a 40-80mm Pentax to go along with it (once the canon adapter arrives) to get the full diameter of the fisheye... hopefully

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My latest curiosity is in the Helios 44 series of lenses for that beautiful/fun bokeh effect. I have found two 13 blade, one 44 and one 44-3 MC each for $170. They look amazing with CLA. The problem is mainly the price, but the 44-3 does not resemble any other 44-3 I've found online anywhere. Every one I've seen are encased in aluminum, but the $170 one is black with silver accents; the seller does mention "very rare Zebra made by BOMA". The 44 is glossy black and low SN from KMZ.
Can someone give me the skinny on these and help me avoid getting ripped off? I see in much older threads here that these lenses were in the past very inexpensive and for the most part still are, but they're usually quite dusty and/or noticeably imperfect in several areas. And these 2 seem to be more rare models and are beautifully clean.
I've read most of the Helios posts and narrowed my choices to either of the above models. That said, there are so many details regarding each version and many opinions as well here on DPReview I am overwhelmed. I like the idea of 13 blades to ensure the beautiful round bokeh effect. Not sure of any other benefit. I also think the multicoating has some important benefits as well. I'm leaning toward the 44-3 for that as well as 52mm filter threads, but not sure why I'd ever want to use filters unless shooting for BW.
Thanks in advance for any advice and/or comments.
ItsMeSB
ps If this should be posted as a new post rather than a reply, I'd appreciate if a Mod would move to appropriate thread.