This is the Vario-Sonnar 4/80-200 zoom lens.
Which can be as good as primes just stopping it down a bit

First, notice this curved piece on top pf the mount.

It is attached with two screws. We have to remove it.

Now we can remove the upper mount ring.

Caution, it is important to make a firm pressure on the screw while turning it, to avoid spoiling the head.

This is what is removed, later we can rebuild the original Contax mount to avoid to lose any part.

After the upper ring is removed, we can unscrew the four fasteners at the base of the mount

These are longer than other Contax lenses, we'll have to use them with the Leitax mount

After the four screws are removed we can lift the whole mount assembly

Which is kept together with this screw.

To remove it, we have to separate the rubber band of the aperture ring

You may have to rotate the aperture ring to align its hole with the screw, so you can access to it.

After removing that screw, the assembly will become three pieces.

The aperture ring has this curved lever, for Nikon and Sony conversions we have to remove it. For Pentax it is not necessary.

It is possible that these two screws now protude too much and scratch the black ring under them.
In this case, a solution is to  screw the curved lever  again  upside down, to avoid this problem

Now we can install again this black ring.

And the aperture ring.

Put the  small bearing ball in its place with a bit of grease.

Now install the Leitax bayonet for Contax MM lenses on it.

The Pentax and Sony conversions would need to use the original perforated ring of the Contax mount, you can see this procedure on other Contax lens instructions.

Ready, now we can use this very good lens on Nikon, Pentax and Sony cameras.
Back to Leitax
Back to Contax for Pentax
Back to Contax for Sony
Back to Contax for Nikon