Lens dismantling

How about you just let me have it?

Not sure why, but looking at those pics Ron posted, it's a sort of heresy.... LOL.

Can someone please post pics of how to dismantle my 100-400 LIS plz?

I can't imagine how many good lenses will never be put back together again !!
Experiment on your old Quantaray that you won't admit owning !!!

after studying those inputs, my attempt was a success. I was able to clean the lens. Wish I could find some tutorials on calibrating.

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calibration with tis lens is done with soldering.

there are 4 solder point and by either removing the connection between them or putting them together you shift the focus on this lens.

i'll see if i can find a good picture for you to show it.

Ron i hope you don't mind me using one of your pictures for this

The focus adjustment on this lens is done by joining or removing solder at the place shown

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my appologies to all.
I went to reply to EosD30freak with a quote and managed to press the wrong button thus changing his post

the extra options i now have as a mod now ,i'm not quite used to....
Hopefully it's back to normal now

ron chappel wrote:
my appologies to all.
I went to reply to EosD30freak with a quote and managed to press the wrong button thus changing his post

the extra options i now have as a mod now ,i'm not quite used to....
Hopefully it's now back to normal now

All that power can be a dangerous thing!

ron chappel wrote:
my appologies to all.
I went to reply to EosD30freak with a quote and managed to press the wrong button thus changing his post

the extra options i now have as a mod now ,i'm not quite used to....
Hopefully it's back to normal now

it's all back to normal now

Resurrecting an ancient thread as my first post - just found this and it's helped me repair a 50mm mk2 that decided to self destruct, so thanks to Ron & the others for some really useful info.

I've got my lens back together and apparently working, I'm just wondering is you need to replace the two glued in tabs?

might be a 3 year old thread that was bumped by andycarnall but i found it quite intresting (and shocking too) lol

Building a computer is MUCH easier than disassembling a lens.

I had to repair a 28-70 2.8L EF. Damaged diaphragm, whole bunch of stuff. No manual. It had dropped from 13 feet onto concrete. Got it back together in a couple of hours and with new parts.

The amount of engineering inside one of the L lenses is VERY good. It's not like some of the third part lenses which will use a plastic cam mechanism, Canon will often use a machined aluminum cam. Quite a bit more durable than the plastic cams.

And yes, I had to strip the lens down to bare elements. The diaphragm is the LAST piece. Fun job.

Ronald S. Jr. wrote in post #981253
If I knew what I was doing, I'd take apart my 70-200L IS. I'd love to see the inside of that thing. I'm sure I could find it on the net somewhere, though.

Why would you do that? Unless your lens is defect?