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marc aurel wrote:
Has anybody ever tried to use the Jasring Contax 645 - Canon EF - Adapter on the Cambo Actus with Cambos Canon lens board with electronic aperture control?
Does the aperture control work?
How much shift can you get without vignetting from the adapter?
I don't have a Jasring C645 to EF adapter, so can't speak to whether it works with Cambo's smart lens panel. But I recently acquired Kipon's version of this adapter and in my experience with it thus far, it works well with Cambo's lens panel:
As for the range of movements that can be achieved using these adapters in series with C645 lenses, due to the small throat diameter of the EF lens mount, hints of vignetting typically start to appear around the 15 mm range, even though most C645 lenses project image circles that are large enough to support a slightly larger range of movements.
For example, the photo below (which is straight from Raw Therapee using its default settings) was taken with the 45/f2.8 at f8 and 15 mm (!) of rear fall -- the maximum amount possible with the Actus B version I have -- applied:
Note: The slightly asymmetrical vignetting visible was due to the carbon fiber lens mount panel being installed slightly crooked on my modified Actus camera, which can be seen in the photo above and which I have since adjusted away.
As ever, though, YMMV!
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