Difference between revisions of "Lens Mounts"

From apertus wiki
Jump to: navigation, search
 
(13 intermediate revisions by 3 users not shown)
Line 1: Line 1:
For components related to [[AXIOM Beta]] see - Parts:[https://wiki.apertus.org/index.php/10-Enclosures_and_Associated_Mechanical_Parts Enclosures and Associated Mechanical Parts].
=Overview of Lensmounts=
=Overview of Lensmounts=


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


== Sony E Mount==
This page contains information about the different lens mounts and the protocols used to communicate with the attached lenses.


Seems to be a good choice because there are adapters available for almost every camera type for small money. Even active mounts for Canon EF
== E Mount==


[http://www.dpreview.com/reviews/sony-alpha-a7r/images/a7r-front-nolens.jpg Image of the E-Mount on dpreview.com]
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.


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


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


Cons
Pros:
* Short flange focal distance allows mechanical adapters to cover pretty much any lens mount out there
* widely adopted
 
Cons:
* not an open standard
* not an open standard
* licensing necessary for lens communication protocol
* licensing necessary for lens communication protocol -> reverse engineering required
* additional tolerance in the flange focal distance with an adapter
* using stack adapters reduces the accuracy and ruggedness of the whole system
 
[https://github.com/LexOptical/E-Mount LexOptical E-Mount on Github] - A work in progress reverse engineering of E-Mount communication protocol.


[http://www.sony.net/SonyInfo/News/Press/201102/11-018E/index.html Sony opens E-mount specifications.] Seems we are on the safe side with using an E-mount adapter...
[http://www.sony.net/SonyInfo/News/Press/201102/11-018E/index.html Sony opens E-mount specifications.] Seems we are on the safe side with using an E-mount adapter...
Line 28: Line 36:


[[File:E_Mount_Bayonet_2-small.jpg | 600px]]
[[File:E_Mount_Bayonet_2-small.jpg | 600px]]
[[File:E_Mount_Bayonet_3-small.jpg | 600px]]


Full 4800 DPI scans available for download at: http://files.apertus.org/AXIOM-Beta/e-mount-scans.zip
Full 4800 DPI scans available for download at: http://files.apertus.org/AXIOM-Beta/e-mount-scans.zip
Screws are 1.6mm outer thread diameter so could be M1.6, screw total length is 5,75mm


=== E-Mount to EOS Adapter *Inside* ===
=== E-Mount to EOS Adapter *Inside* ===
Line 53: Line 65:


We can replace this board with our own adapter board to connect to the cameras I/O's
We can replace this board with our own adapter board to connect to the cameras I/O's
===Passive EF Mount===
===Active Canon EF Mount===
#body <-> lens communication protocol: http://www.magiclantern.fm/forum/index.php?topic=3796.0
#pins and contacts: http://en.wikipedia.org/wiki/Canon_EF_lens_mount
#EF-S protocol: http://pickandplace.wordpress.com/2011/10/05/canon-ef-s-protocol-and-electronic-follow-focus/
===Nikon F-Mount===
[[File:Nikon-bayonet01.jpg|600px]]
Picture of Nikon F bayonet mount components.
Measured Bayonet Thickness: 1.3mm
#general information: http://en.wikipedia.org/wiki/Nikon_F-mount
#body <-> lens communication protocol: https://nikonhacker.com/viewtopic.php?f=8&t=1437
#technical drawing of F-mout http://en.wikipedia.org/wiki/Nikon_F-mount#mediaviewer/File:Nikon_F-mount_mechDwg.png
===Micro Four Thirds Mount===
#body <-> lens communication protocol: http://preamp.org/revenge/four-thirds-communication-protocol


==Open standard Mount==
==Open standard Mount==
Line 68: Line 103:


[https://pickandplace.wordpress.com/2011/10/05/canon-ef-s-protocol-and-electronic-follow-focus  Electronic follow focus experiment]
[https://pickandplace.wordpress.com/2011/10/05/canon-ef-s-protocol-and-electronic-follow-focus  Electronic follow focus experiment]
----
[[Category:Hardware]]
[[Category:Hardware]]
[[Category:Lenses]]
[[Category:Lens Mounts]]
[[Category:Canon]]
[[Category:Sony]]

Latest revision as of 04:05, 10 January 2019

For components related to AXIOM Beta see - Parts:Enclosures and Associated Mechanical Parts.

1 Overview of Lensmounts

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

This page contains information about the different lens mounts and the protocols used to communicate with the attached lenses.

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.

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

LexOptical E-Mount on Github - A work in progress reverse engineering of E-Mount communication protocol.

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

E Mount Bayonet Main.jpg

E Mount Bayonet 2-small.jpg

E Mount Bayonet 3-small.jpg

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

Screws are 1.6mm outer thread diameter so could be M1.6, screw total length is 5,75mm

1.1.2 E-Mount to EOS Adapter *Inside*

Inside of our E-mount to EOS adapter sample

E-mount-EOS 01.jpg

µC Board to translate from Sony E to Canon EOS


E-mount-EOS 02.jpg

EOS contacts with springs on the PCB side


E-mount-EOS 03.jpg

E-mount-EOS 04.jpg

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

1.1.3 Passive EF Mount

1.1.4 Active Canon EF Mount

  1. body <-> lens communication protocol: http://www.magiclantern.fm/forum/index.php?topic=3796.0
  2. pins and contacts: http://en.wikipedia.org/wiki/Canon_EF_lens_mount
  3. EF-S protocol: http://pickandplace.wordpress.com/2011/10/05/canon-ef-s-protocol-and-electronic-follow-focus/

1.1.5 Nikon F-Mount

Nikon-bayonet01.jpg Picture of Nikon F bayonet mount components.

Measured Bayonet Thickness: 1.3mm

  1. general information: http://en.wikipedia.org/wiki/Nikon_F-mount
  2. body <-> lens communication protocol: https://nikonhacker.com/viewtopic.php?f=8&t=1437
  3. technical drawing of F-mout http://en.wikipedia.org/wiki/Nikon_F-mount#mediaviewer/File:Nikon_F-mount_mechDwg.png


1.1.6 Micro Four Thirds Mount

  1. body <-> lens communication protocol: http://preamp.org/revenge/four-thirds-communication-protocol

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