Leica 39mm thread mount to Pentax/M42 adapter

When Zenit switched to M42 mount from the original 39mm Leica thread I believe KMZ made an adapter to allow use of LTM lenses on the new post 3M Zenits. Are these still available? Are there other makes out there?
Pushkin

<blockquote id="quote"><font size="1" face="MS Trebuchet, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Pushkin</i>
<br />When Zenit switched to M42 mount from the original 39mm Leica thread I believe KMZ made an adapter to allow use of LTM lenses on the new post 3M Zenits.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

At first, KMZ never use "the original Leica thread" (M39x26tpi/28.8) -- only M39x1/28.8 for a Zorkies and M39x1/45.2 for the first Zenits.

KMZ made adapter from M39x1/45.2 lens to M42x1/45.5 camera part ("KP" ring)
See http://www.zenitcamera.com/qa/qa-adapters.html
and http://www.zenitcamera.com/mans/instr-M39-M42/instr-M39-M42.html

Btw, it is possible to use M39x1/45.2 lenses on M39x1/28.8 camera parts -- one of the old "UTZ" rings thickness was 16.4 mm (45.2-28.8=16.4).
See http://www.zenitcamera.com/qa/qa-extrings.html

(Sorry all sources in Russian)

Pushkin,

You will probably only be able to use 39mm lenses that are made for Zenit mount (for old 39mm Zenits), that is they have 45.5mm optical registration (backfocus). These adapters run about $10, and you can easily obtain in USA from www.fedka.com, or outside of USA I'm sure you can find them on eBay. It's just a threaded ring that converts from 39 to 42mm... don't try to mount any LTM lenses as Zoom pointed out they will not focus correctly.

Vlad

Thank you Zoom and Vlad, I understand the matter now.
Pushkin