Here you have the instructions for the Zeiss/Contax Mutar III , for the Mutar II , please follow this linklogo
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This is the Carl Zeiss Mutar III 1.4x teleconverter.
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First, unscrew the rear mount.
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And remove it.
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Now remove these four screws.
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So you can lift the entire optical group.
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And remove the two levers facing the rear side from it.
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We have to remove this one too.
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There is a spring that we have to unwrap from this screw.
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Ok, free.
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Now we can unscrew that lever.
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Done, please save all the levers and screws to be able to rebuild this lens to the original condition.
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Put the optical group in its place and screw it.
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Now we can install the Leitax M42 mount .
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And you can use any M42 adapter for your camera.
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And the Mutar III is ready to work with a selection of Contax lenses.
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Like the Sonnar 180/2.8.
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On Pentax cameras, we can set the focal length so the anti shake will work properly
180x1.4=252mm. 
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You can buy this M42 mount for your Mutar III in the Leitax website
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