C - mount lenses on 5x crop mode?

[joeydingding]

C  mount lenses on 5x crop mode?

Will this work without vignetting?

[TrueIndigo]

I'm not sure about the vignetting, but the lens flange distance is the main problem (C-mount needing 17.526mm, while Canon EF = 44.0mm). On the 7D RAW thread, forum user jairobbo posted a brief mention of a DIY experiment with crop mode in which they stuck a C-mount lens to a Canon body cap (their post was dated January 6th - I was interested enough to make a note of it!). It sounds like the rear element of the lens must have protruded inside the camera somewhat, so it would be good to know if this can be done without endangering the camera.

[Oswald]

Works properly with eos M. 3x crop covers 1/2" lens. I love to use my 8-48mm f1.0 lens with eos m. No vignette.

[joeydingding]

Works properly with eos M. 3x crop covers 1/2" lens. I love to use my 8-48mm f1.0 lens with eos m. No vignette.

Yummy! Sounds good! If I only could find a way to get my Angenieux Retro focus working on 3x crop mode. The crop factor is a pain in the ass to work with. 

May I ask... What is the crop factor?

[Oswald]

Yummy! Sounds good! If I only could find a way to get my Angenieux Retro focus working on 3x crop mode. The crop factor is a pain in the ass to work with. 

May I ask... What is the crop factor?

About 4.8.

[joeydingding]

I'm not sure about the vignetting, but the lens flange distance is the main problem (C-mount needing 17.526mm, while Canon EF = 44.0mm). On the 7D RAW thread, forum user jairobbo posted a brief mention of a DIY experiment with crop mode in which they stuck a C-mount lens to a Canon body cap (their post was dated January 6th - I was interested enough to make a note of it!). It sounds like the rear element of the lens must have protruded inside the camera somewhat, so it would be good to know if this can be done without endangering the camera.

I'll ask an engineer who also modified my Angenieux zoom lens for the GH2. Maybe he can fix something I'll keep you posted but It would be a dream come true If could mount my beloved retro focus on the 7D in 3x crop mode

[joeydingding]

About 4.8.

I mean what was the focal length of your lens.. 8mm x 3? 

[Oswald]

Ahh. 40mm-230mm f1.0 about.