im a Nikon guy (D40) but he must of had balls of tungsten to open up his rebel :-\ any who this is a nice hack i had no idea u could add that :-)

Posted at 8:03 am on Jun 29th, 2008 by Alex McCown

YAY! I made it to hack-a-day! :-)

Posted at 8:51 am on Jun 29th, 2008 by Koray

@ Koray Congratulation, awesome job on your hack!

Posted at 10:32 am on Jun 29th, 2008 by BlizzardDemon

yah Koray nice one 5/5

Posted at 11:56 am on Jun 29th, 2008 by alex mccown

Will,

The 300D is the original Digital Rebel… The 350D is the XT. Just FYI :)

Posted at 3:49 pm on Jun 29th, 2008 by Shadyman

:-) Thanks guys, it was fun.

Posted at 6:16 pm on Jun 29th, 2008 by Koray

koray, very nice work, it looks like it turned out well for you.

Posted at 8:34 pm on Jun 29th, 2008 by Luke

so the chip is just an serial flash rom?

Posted at 1:50 am on Jun 30th, 2008 by rasz

Hi rasz, I don’t know what type it is, but all it does is to communicate with the camera through a serial connection and report a lens focal length and maximum aperture value. It is basically simulating the original controller chips inside EF lenses. There is not much documentation on this, but there is one commercial website with some info, you may be interested:
http://www.birger.com/Merchant2/merchant.mvc?Screen=ef232_home

Cheers. K.

Posted at 3:35 am on Jun 30th, 2008 by Koray

thanks for the info, the one you linked is reprogrammable
the one you used looks just like a 6 pin SOT-23 serial eprom (34VL02 ?).
Do those chips talk to camera (two way) or just inform the camera what is connected (like SPD on RAM chips in PCs)?

Posted at 4:33 am on Jun 30th, 2008 by rasz

hi rasz, I think it just informs the camera what is connected (i.e., focal length: 50mm maximum aperture:f/2.0). You can order these chips on ebay and even ask for a specific focal length and aperture value pre-programmed for you. even more, there is this dandelion type for olympus cameras, which can be reprogrammed by the user on the go (i don’t know how). Before the proliferation of these chips/adapters, manual lenses (i.e. M42, Zuiko, Nikon ones) were cheap as peanuts. Now the prices are going up and up… Amazing. Cheers, K.

Posted at 6:16 pm on Jun 30th, 2008 by Koray