OK means this lens has no lip, and should work just fine. NG means No Good - the "lip" or "guard" interferes with infinity focus. Q means Questionable  These lenses have a lip, which may prevent infinity focus, but these lenses has not yet been tested with an adapter. 

* denotes no lip, but some concern that the entire lens barrel may move close enough to the
focal plane to interfere with the chip.  Not yet tested with an adapter.

Thanks to Steve Barbour, Aram Langans, Doug Herr, Xavier Bill, Bill Abbott, Fred Hess,
Bob Shaw*, Gary Pinkerton, Howard Cummer, Wu Cheng, Gary Todoroff & Bob Hutton
for the information included here.

If you want to compare the Russian Dandelion AF confirm chip with the
Shanghai Specials, discussed above, click here.

If you wish to read previously published articles on Leica,
you can find them by clicking here.

If you wish to check out my wildlife photos, click here.

If you have a Leitz/Leica lens not shown here, please take a moment to look at the back and
see if it has a guard similar to that shown above.  Either way, please email me at
dsy(at)furnfeather.net and let me know, so I can add it to the list.  Many thanks.