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I am user of Black Magic Pocket Cinema Camera and Pentax of course. I would love to use my Pentax lenses, but with 2,88 ratio I need focal reducer and there is problem to find info, reviews or experiences about focal reducers compatible with Pentax.

Please if you have experience or knowledge, please share.

Focal Reducer Speed Booster Adapter Pentax K PK Mount Lens to Sony NEX A6000 5T | eBay

Focal Reducer Speed Booster Adapter Pentax K Mount PK Lens to Micro 4 3 GX7 M43 | eBay

Camdiox Focal Reducer Speed Booster Pentax K PK Lens to Micro 4 3 M43 Adapter | eBay

Pentax K PK Lens to Micro 4 3 M43 Mount Tilt Adapter Olympus E P3 PL5 GF3 GF5 G1 | eBay

Focal Reducer Speed Booster Adapter Pentax K PK Mount Lens to Sony NEX A6000 5T | eBay

nonpentax:
Jinfinance Focal Reducer vs. Metabones Speed Booster: Sony Alpha / Nex E-mount (APS-C) Talk Forum: Digital Photography Review
Jinfinance Focal Reducer vs. Metabones Speed Booster: Sony Alpha / Nex E-mount (APS-C) Talk Forum: Digital Photography Review

universal:
Micro Four Thirds Focal Reducer Shootout: Micro Four Thirds Talk Forum: Digital Photography Review

Please share knowledge, experience and fill the list. If I missed some previous thread - I am sorry, I was really looking for info all over the place.