Second etalon

[Dawson]

I have a 60mm tilt adjusted Lunt, single stack. The 60mm LS60FHa second etalon to screw onto the front is £3200 new to get it double stacked. If I got a second hand 60mm Lunt with pressure tuned etalon, could I take the pressure tuned etalon out of the second 60mm Lunt and insert it next to the tilt adjusted etalong in the original scope? Below is an image of a tilt adjusted 60mm Lunt, the middle image what I would get by sticking a second etalon on the front, and the lower image how I’m asking if it is possible to insert a pressure tuned ethalon in mid optical path. Thanks for any thoughts.

James

• This topic was modified 3 weeks, 4 days ago by Dawson.
• This topic was modified 3 weeks, 4 days ago by Dawson.

Attachments:

1. 

   2ND-ETALON.png
   

[Dawson]

I emailed Lunt to ask them. I’ve had a very helpful reply. The summary is:

“You cannot simply take a pressure-tuned etalon from one 60 mm and insert it into a tilt-tuned 60 mm — they are not plug-and-play. If you want pressure tuning, the safe path is a factory retrofit by Lunt, or purchasing a PT model outright.”

It is all to do with spacing, and alignment.

James

[Author]

Posts