Focusing E-Mount For Ultrafast Lenses
Description
There Are A Variety Of Old Ultrafast Lenses Cheaply Available. These Lenses, Usually Marked Between F/0.75 And F/1.6, Typically Have No Aperture Iris, No Focus Mechanism, And A Giant External Screw Thread Intended For Mounting. They Generally Can'T Focus To Infinity Even On A Mirrorless Body, And Iq Is Scary Soft, But Sometimes That'S A Feature.... Anyway, I Originally Mounted These Lenses By Gluing An M42-To-A-Mount Adapter On The Back (As I Described In My Instructable, Http://Www.Instructables.Com/Id/Using-Ultra-Fast-Lenses-On-Dslr-Cameras/ ). Instead, I'Ve Now Built 3D-Printable Focusing E-Mount Adapters Where The Lens Screws In Using The Large External Thread (See 2Nd Photo) And Can Be Focused By Partial Unscrewing. One Mount Has A 60Mm Thread That Works With My Kowa 55Mm F/1 And 42Mm F/0.75; The Other Has An 80Mm Thread That Works With My Xr-Heligon 95Mm F/1.3. The E-Mount Flange Is A New Design That Should Fit Both Older Sony E-Mount Bodies And The Newer All-Metal E-Mounts (They Have Been Tested With Nex-5 And A7Ii). In Fact, The Flange On The 80Mm Adapter Has A Different Internal Profile From The 60Mm One, Because The Rear Element Of The Xr-Heligon Is Huge And A Standard-Thickness E-Mount Could Vignette. The Last Couple Of Photos Were Taken Using The Purple Pla Adapters On An A7Ii And Nex-5. The Kiwi Was Using The Rodenstock Xr-Heligon And The Princess Ornament Was Using One Of The Kowas. Note That The Large Flat On The Adapters Makes It Difficult (But Not Impossible) To Access The E-Mount Body Lens Release Button And The 80Mm Adapter Just Barely Clears The Grip On My Nex-5, But The Only Way To Avoid These Issues Would Be To Mount The Lens Farther Away From The Sensor, Which Would Limit The Focus Range.
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