focal reducer speed booster adapter Pentax PK K to Sony NEX

Started May 9, 2013 | Discussions thread
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Joe Ogiba
Joe Ogiba Veteran Member • Posts: 4,627
focal reducer speed booster adapter Pentax PK K to Sony NEX

Focal reducer/Speed booster adapter
for/Pentax PK K bayonet lens to Sony NEX mount 5 6 7 camera FS700 FS100
All metal structure, with excellent opticals (4 elements/2 groups, super multi-coated) what it does:
• reduce the focal length (by 0.72x wider)
• Ex. 50mm lens on NEX with the adpater, eff. focal length is 50mm x 1.5(crop) x 0.72 = 54mm
  • effectively increases the maximum aperture of the lens by 1 stop
• (in other words, under the same aperture, you can use faster shutter speed (by 1 stop).
  what it does not: there is no electronic integration, no auto fucusing
(you still need to manually focus your lens and aperture, etc.)

 Joe Ogiba's gear list:Joe Ogiba's gear list
Sony RX10 III Sony Alpha 7R Panasonic Lumix DMC-GH4 Samsung NX1 Sony a6300 +1 more
Panasonic Lumix DMC-FS7
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