Gday Ken
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Definitely sounds like the ITF filter element has failed.
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Go on, cheer me up some more :-)
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The filter is held by a retaining ring (with the usual two diametric small holes), this can (just!) be accessed from the inside of the black box
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Yep, seen some of the threads on this on CN and a few blogs, but also that there were several variants. The disassy seems straight forward, just didnt want to apply force if there was some hidden trick to it.
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The replacement ITF is available from Maier Photonics in the US and is a drop in fit.
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The best info i found on this was a CN user called DavidG
https://www.cloudynights.com/topic/5...ado-pst/page-2
and he linked to
http://maierphotonics.com/656bandpassfilter.aspx
so that looks like the same beastie.
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I assume you are out of the five year warranty period?
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Yep, bought in 2007. I mainly use my Lunt80 but tried the PST in this mornings sucker holes, and noticed how dim it was.
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If you look carefully at the threaded focuser rod you'll see a circlip
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Will get out my magnified headset and tweezers :-)
I might even machine up a barrel clamp so i can get the whole assy out in one piece.
Many thanks
Andrew