Yoshizen's Blog

Electronics in the Lens

Elec-Mount Adapter(A)610-001

Lens of today’s hi-tech DSLR was connected to the camera body

on its bottom, mechanically and electronically.

Except the Canon EF Lens (for EOS), the Aperture lever has to be

pushed from the camera side, therefore when the lens was used in

rivers direction, either the Lens become completely manual (if the 

Aperture ring was still there) or just out of control. — But Canon’s EF

lens has its own stepping motor to drive the Aperture, hence as long as

they are electronically connected, the Aperture will function as normal.

(If not connected, there is no way else to use Aperture but fully open.)  

Elec-Mount Adapter(B)609-001

To have an electronic connection, we only need a simple cable !  

So, I made this adapter, long time ago, in fact soon after the Canon

introduced their EOS camera. ( yet, it was a film camera then.)

—– the connection between the camera and a lens was made by two

sets of male and female contacts. = I made and mounted them on

Body-cap and a Lens-rear-cap,  and jointed them with a cable !  

= With this cable, even when a lens was held in angle, still the

lens function like as normal.

I could use this on EOS 620 and RT with EF 28 mm lens for

experimental close-up with tilted lens etc —– though, few days

ago, when I tested this again, with my latest Canon gear, 

I found, 5D camera refused to work with this.  😀  😀


On the appearance, it was just an 8p connections and two of them

were the ground line, and the signal lines for each direction =

only 5 lines seems to be used though, as long as all 8 lines were

connected one-by-one there should be OK, other than the trouble of

impedance or magnetic interference kind, caused by an extended wires.     

(Those interference might be used to detect unauthorized connection.

And if anything odd was detected, Camera CPU may check the Lens’ ID.

—– If no answer was received, then camera stop to work normal.  🙂 )


These days, the lens transmit their own ID for their own graphic program

to correct the individual characteristics of the lens, such as the aberration

or corner fall-off of the light.  = To correct the Chromatic Aberration,

Red signal from the Pixels would be shifted inward and Blue signal would be

shifted outward accordingly ! (So, the picture become even sharper !  😀 )

Though, I’m not necessary happy with this kind of approach —– once we

start to rely on computer graphics, we may no longer need to have such as

ultra wide angle lens or fisheye-lens, as we can get the same effect by

stitching the photos or use distorting graphic effect or “filters”.

Graphic design is a desc top process, it is not a photography on the spot.

Photography is a Site-specific, Moment-bound “interaction”

not just a visual effect.

= What “I” witnessed and how I lived with its moment  IS  the matter.

If the artefact left was a fake, the person and the life was a fake. 


At a moment, I’m quite amazed how  Canon 5D  could detect

“something odd” about this cable, and teasing me while showing

photo-number [50] in the view finder, instead of [950] on the

camera top,  and not showing “Focused” indicator  etc.

—– not malfunction but maliciously falsified on purpose.  😀

(It takes time to debag and hack-into the camera. )



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  1. […] A funny story was that, when I tested “Lens Extension Cable“ my […]

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