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Old 28-01-2018, 10:51 AM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
Mods to ED80 - PST double stack

As you may know I use an SM60 etalon on an ED80 for solar observing.

I also use a PST Mod on a 102/1100 Telescope Service (Kunming) refractor.

I have made adaptors to allow the SM60 to be mounted on the 102mm and it gives great double stacked performance, but with a limited FOV due to the long focal length.

Looking at the OTA of the ED80 I found by removing the focuser and replacing it with an adaptor plate (identical to the one on the rear of the 102) I could add the PST mod to the ED80 - this should, with the 600mm fl give double stack full disk observing.

The adaptor (thanks to Les!) is about to be fitted - probably early next week due the the long weekend and family commitments....
This will give the necessary f10 for the PST mod;with a SM60 front etalon on the ED80.

Keep you posted.
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