funnily enough i did this to 2 lenses the other day
let me know if you have any questions
edit DO NOT USE SUPERGLUE UNDER ANY CIRCUMSTANCES!!!!!!!!
I don't know how I missed this post!
Thanks a lot for the information. Does the installation require much manual skills? Is the epoxy glue strong enough to keep the chip still, even with heavy use? Does it make any mess on the lens?
Thank you very much for your help!
super glue dries too quickly, is britle and has nasty vapour ie high risk
the epoxy glue has a slightly longer drying time and goes through a tacky flexable stage which allows minor adjustment of position it takes alot longer for it to achieve 100% strength so after its glued you will need to wait maybe 4 hours before mounting for programming the chips.
expoxy glue is also stronger, more durable and has a higher temperature range resistance than super glue
this is what I used http://www.selleys.com.au/adhesives/household-adhesive/araldite/five-minute-everyday
its 2 part so you mix equal quantities on a piece of cardboard or something with a toothpick and then apply with another clean toothpick as that allows nice control over how much gets placed
the AF chips are also nice because they make the exif data in your files read correctly for the lens instead of 50mm and aperture 00
i would also recommend cutting a piece of paper or thin card into a circle to pop over the rear lens element while glueing so just in case there is a rogue drip it cant do any damage.
the chips i used come with a guide template to allow getting the chip in exactly the right spot and they also come with some little plastic spacer / filler pieces (little curved pieces of plastic) which can be trimmend to suit the lens with a razor blade and fine sand paper. tehse chips are designed and sized to sit exactly flush with the back of the lens mount so not modification of the mount is necessary.
hope that helps