focal reducer speed booster adapter Pentax PK K to Sony NEX

Started May 9, 2013 | Discussions thread
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Joe Ogiba
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focal reducer speed booster adapter Pentax PK K to Sony NEX
May 9, 2013

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.)

http://www.ebay.com/itm/focal-reducer-speed-booster-adapter-Pentax-PK-K-Sony-NEX-3-5-6-7-FS700-FS100-/200921816454?pt=US_Lens_Adapters_Mounts_Tubes&hash=item2ec7df9d86&afsrc=1

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