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koji kawakami | profile | all galleries >> Lens Modifications >> Contax G-Sonnar 90mm to F-mount conversion tree view | thumbnails | slideshow

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Contax G-Sonnar 90mm to F-mount conversion

The modification goes S90m_1 to 5, the right one in S90m_5 is the final shape of modified S90,
which is mounted on TOMY(BORG) M42 helicoid (16~26mm), which is again mounted on M42->EF
adapter with EOS rear lens cap. This helicoid is not thin enough to allow "infinity focus", you may
have to get a thinner helicoid (12~19mm) from TOMYTEC or eBay in order to get infinity focus.

From S90m_7 to S90m_11 is the process for F-mount conversion after converting to M42-mount,
since my main cameras are Nikon dSLRs now. Even if we may get a full-frame mirror-less camera
such as Sony a7, I hate to use already existing Contax-G lens to E-mount adapters including AF one.
S90m_1
S90m_1		 S90m_2
S90m_2		 S90m_3
S90m_3		 S90m_4
S90m_4		 S90m_5
S90m_5		 S90m_6
S90m_6
Modified G-Sonnar 90/2.8 with 5D
Modified G-Sonnar 90/2.8 with 5D		 Contax AX with modified G-Sonnar 90mm F2.8
Contax AX with modified G-Sonnar 90mm F2.8		 Reflection @f5.6 5D
Reflection @f5.6 5D		 Watch @f22 1:1 5D
Watch @f22 1:1 5D		 S90m_7
S90m_7		 S90m_8
S90m_8
S90m_9
S90m_9		 S90m_10
S90m_10		 S90m_11 Completed
S90m_11 Completed		 F mount G-S90 with Nikon F2 eye level
F mount G-S90 with Nikon F2 eye level		 central crop of full size image @f2.8 D700
central crop of full size image @f2.8 D700		 central crop of full size image @f2.8 NEX5
central crop of full size image @f2.8 NEX5
Nikon F2 @f22 0.45m D700
Nikon F2 @f22 0.45m D700		 Bloor St @f2.8 D800E
Bloor St @f2.8 D800E		 Modified Contax G-Sonnar 90mm with a7
Modified Contax G-Sonnar 90mm with a7		 length = 47mm, weight = 190g (as an F-mount lens)
length = 47mm, weight = 190g (as an F-mount lens)		 Modified G-Sonnar 90mm with a7R2
Modified G-Sonnar 90mm with a7R2		 with NIKON Z7
with NIKON Z7
ROM @f2.8 Z7
ROM @f2.8 Z7		 Hibis 1 @f8 a7
Hibis 1 @f8 a7		 Red tulip @f4 a7
Red tulip @f4 a7		 Clematis @f5.6 a7R2
Clematis @f5.6 a7R2		 Pansies @f5.6 a7R2
Pansies @f5.6 a7R2		 threeleaf purple SHAMROCK @f16 0.52m Z7
threeleaf purple SHAMROCK @f16 0.52m Z7

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