M42x0.75 Adapters for Cameras and Astronomy

This is a set of 1mm, 2mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm M42x0.75 adapters.  The 4-10mm adapters are Male to Female style adapters, while the very tiny 1 and 2mm adapters are Female to Female adapters (they just sit between any Male to Female connection).  I made these to attach my astronomy camera to my telescope to help determine the proper backfocus distance.  They may be useful in astrophotography or other photography applications.

Be sure to use a material that's appropriate for the conditions you use these in.  Test them thoroughly before use and protect your equipment!

I've included the Fusion 360 file for the Male to Female and Female to Female adapters.  You'll need to install a custom thread file.  I used this XML file as a guide to add my custom dimensions.  You can download my version of it in the attached CamerFilterMetricProfile.txt file.  Rename the extension to .xml, and install it with these instructions.

The existing dimensions I found elsewhere online did not fit any of metal adapters I already had, so I re-measured and created my own.  The male threads seem to work very well.  The female threads work, but they are very slightly off in some way that makes them screw on with a very subtle wobble.  If anyone has better dimensions, please share!  Here's what I used:

      <Thread>
        <Gender>external</Gender>
        <Class>CUSTOM_WIDER</Class>
        <MajorDia>42</MajorDia>
        <PitchDia>41.51</PitchDia>
        <MinorDia>40.912</MinorDia>
      </Thread>
  &lt;Thread&gt;
    &lt;Gender&gt;internal&lt;/Gender&gt;
    &lt;Class&gt;CUSTOM&lt;/Class&gt;
    &lt;MajorDia&gt;42.45&lt;/MajorDia&gt;
    &lt;PitchDia&gt;41.96&lt;/PitchDia&gt;
    &lt;MinorDia&gt;41.45&lt;/MinorDia&gt;
    &lt;TapDrill&gt;40&lt;/TapDrill&gt;
  &lt;/Thread&gt;</code></pre><p>&nbsp;</p>