I have a Canon 1DS (first model) and 1D Mark II.

When I use certain adapters or extension tubes on these cameras I get an Error Message and it will not take a picture.

I regularly use Leica R lenses on these cameras with many different brands of adapters.

I bought a Leitax adapter and installed I on my 80-200 mm lens. When I tried it on my cameras I got the error message. When I contacted Leitax they said it works for others, this is the same answer I get about this problem from the other equipment suppliers that doesn't work with these cameras. I removed the Leitax mount and replaced the screws in the Leica mount, then attached one of my cheap adapters from China. It works fine with this adapter and always has.

I also experienced the same error message problem with my Kenko Extension Tubes for Canon C/AF 36mm, and an adapter that I bought to use my Canon FD lenses on these cameras. I can use Leica extension tubes without a problem with the adapters that work on the lenses.

I would appreciate any feedback from others that have experienced this same problem and better yet from readers that have solved this problem.

Thank you,

Alan

Lenses:
1) 80-200 F 4.0
2) 100 F 2.8 APO Macro
3) 35-70 F 4.0
4) 21-35 F 3.5-4.0
5) and others

Adapters That Work:
1) Russian Brand
2) many from China
3) German

Does your Leitax adapter have the Dandelion chip added? Also, there is a micro switch on the 1-series that needs to be tripped, so I do not know if the earlier Leitax adapters had the necessary flange on the adapter to trip that switch. I just got a Leitax adapter for the the Canon 1Ds Mark III and it works fine. I think Canon removed the micro switch on the Mark III's. Do a search on "Canon 1 Series" + "Micro Switch" and see what Google returns.

Here is my Leitax review if you're interested - http://www.pebbleplace.com/Review/Leitax_Leica_Canon_Adapter.html