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Canon EF lens mount connectors

Does anyone has a clue how the canon autofocus lenses are controlled by the camera? I need a fast and accurate focusing system to my macro/micro/astro-photography. The lousy finder of Canon 350D isn't much help for manual focusing. Picture is way too small and since there is no any kind of prism in the finder it is very hard to get good focus. Is the lens focusing motor controlled directly by the camera or is there some sort of bus (and processor) on EF-lenses?

Jimi
Wed, 31 Aug 2005 01:45:11 -0700

Jimi,

I believe there is a bus and a processor on the EF-lenses. The camera communicates to the lens using a proprietary protocol. See the "eyepiece to make telephoto lens into telescope" TrackBack I added below for more information.

Chieh Cheng
Wed, 31 Aug 2005 10:38:32 -0700

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Title: eyepiece to make telephoto lens into telescope
Weblog: Camera Hacker
Excerpt: "Looking at the front of the camera body and reading from left to right, the signals are: 1. VBAT 2. P-GND 3. P-GND 4. VDD 5. DCL 6. DLC 7. LCLK 8. D_GND Pins 2 and 3 are combined into one large contact on the lens. My interpretation of these signal names is as . . .
Tracked: Wed, 31 Aug 2005 10:32:57 -0700

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