SM60-PST mod on ED80

[Merlin66]

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.

[Ibbo!]

Thanks for the info.

 

Same 200mm inside focus?

[Merlin66]

Yeah, no change to the Majic -200mm. Mandatory with the standard PST Mod.

 

[Ibbo!]

Thanks Ken

I have the pst mod on an 80mm f11 and also a d/s unit worth a go when i can get to the lathe again - doing a bit of wood work so its burried again.