Lens Mounts

1 Overview of Lensmounts

http://en.wikipedia.org/wiki/Lens_mount

1.1 E Mount

Seems to be a good choice because there are adapters available for almost every camera/lens type for reasonable cost. Even active mounts for Canon EF, etc.

Image of the E-Mount on dpreview.com

http://en.wikipedia.org/wiki/Sony_E-mount

Specs:

• Outer diameter 46.1mm
• Flange focal distance is very short: 18mm
• Frame size APS-C, 35mm

Pros:

• Short flange focal distance allows mechanical adapters to cover pretty much any lens mount out there
• widely adopted

Cons:

• not an open standard
• licensing necessary for lens communication protocol -> reverse engineering required
• using stack adapters reduces the accuracy and ruggedness of the whole system

Sony opens E-mount specifications. Seems we are on the safe side with using an E-mount adapter...

1.1.1 E-Mount Bayonet Scans

Full 4800 DPI scans available for download at: http://files.apertus.org/AXIOM-Beta/e-mount-scans.zip

1.1.2 E-Mount to EOS Adapter *Inside*

Inside of our E-mount to EOS adapter sample

µC Board to translate from Sony E to Canon EOS

EOS contacts with springs on the PCB side

JL ... position of the EOS mount contact springs

We can replace this board with our own adapter board to connect to the cameras I/O's

1.1.5 Passive Nikon F-Mount

Measured Bayonet Thickness: 1.3mm

1.2 Open standard Mount

P+S Technik offers with their IMS mount an open standard. For AXIOM Beta the adapters are too expensive, but for sure an option for AXIOM Gamma.

Is there a affordable really open standard mount out there?

please add it here...

1.3 Talk with a Canon Lens

Research links for the Canon EF-S Protocol

Electronic follow focus experiment