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jpwilliams.com

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    Kinallen, Dromara, Co. Down

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  1. Sorry, pasted that from facebook, should be https://www.jpwilliams.com/Astronomy/Hardware/Mount-Rail/index.html
  2. I've documented the process of how I created a rail kit for my HEQ5 - it might not be as neatly finished as one you may be able to buy from a well known mount tuner (although they seem to have been out of stock for quite some time) but seems to do the job. Details at https://www.jpwilliams.com/Astronomy/Hardware/Mount-Rail/index.html (Edited to fix the link 🙂)
  3. Thanks, I've spacers to make the 55mm, just need a clear night to try them out.
  4. I've just taken delivery of the 72ED and OVL FF which @Rustang listed in the classifieds last week. I want to use it with my Altair 183c Pro Tec, which has 17.5mm front flange to sensor, and an Altair filter holder which is 17mm thick with M48 front & T2 back threads. I was planning on adding a 15.5mm M48 spacer, to give the desired 55mm back focus. I've discovered the FF has a M/T?42 thread at the back , luckily I have a suitable adapter which is only a couple of mm deep, so I'll be able to connect my 15.5mm tube (indirectly) to the back of the FF. Plan will be FF > M/T42 > M48 15.5mm > M48 Filter Holder T42 > Hypercam Is the 55 mm distance critical? I've seen a few discussions that ~60mm might give better results. With having to convert the rear side of the FF back to M48, I'm gaining the thickness of the conversion ring, I do have the M48 variable ring I could use instead of the 15.5, it's got a minimum distance of 13.85mm, so would give me 1.65mm back. Thanks John
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