photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment
koji kawakami | profile | all galleries >> Lens Modifications >> Contax G-Sonnar 90mm to F-mount conversion tree view | thumbnails | slideshow

Minolta MC Rokkors to EF-mount conversions | Contax G-Biogon 21mm to M-mount conversion | Contax G-Biogon 28mm to E-mount conversion | Contax G-Planar 35mm to E-mount conversion | Contax G-Planar 45mm to M-mount conversion | Contax G-Sonnar 90mm to F-mount conversion | Canon FD 55mm F1.2 S.S.C. to EF-mount conversion | How I made a Miranda lens adapter for E-mount | Minolta Rokkor-PF 45mm to E-mount conversion

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