Another great capture!
Well done.
When I compare last year's activity to now -things are certainly hotting up!
I'm getting the chance next week to set up a double stack SM60, a 88mm modded PST, a SM60/PST double stack and a 60mm double stack Lunt - now that should be interesting!
...
I'm getting the chance next week to set up a double stack SM60, a 88mm modded PST, a SM60/PST double stack and a 60mm double stack Lunt - now that should be interesting!
Humm... interesting combinations. I'd expect the Lunt DS and SM60 DS would work best.
always love your work peter. Does your solarmax have double stack?
Thank you one and all for the positive feedback.
I'm thinking I'm slowly getting a handle on this high-res h-alpha solar imaging...but I have to say: the seeing on the day pretty much defines the end result.
Peter,
Great set-up!
I have and use the SM60 pair as a double stack on an ED80.
Reading your write-up I have to disagree with the method of tuning...
Each etalon must be tuned off band but in DIFFERENT directions ie one slightly towards the blue the other towards the red - this gives maximum resolution and minimum band width. When properly tuned the peak intensity should be about 50% of that with a single etalon.
I've just gone through the "tuning" process with a 60mm Lunt DS and the difference was noticeable (unfortunately the "deadband" on the internal etalon makes the jobs doublely difficult.)
The attached sketch shows what we are trying to achieve.
(I also show my "patented" Vegemite DS controller! and a method of using the PST etalon as a double stack)
(I also show my "patented" Vegemite DS controller! and a method of using the PST etalon as a double stack)
The Meade SM90 is a little different to the original Coronado, in that it has a form of "pressure tuning" that does not work in the same fashion as the tilt stage, I think, but am not sure, it alters the central frequency in the opposite direction to that of the tilt stage.
Your conclusions for the standard configuration look like they are valid....I will have to test this to see if the system can't be tweaked a little more!
Worth looking into...
(With the spectroscope behind the single and then the double etalon you can easily see where the bandwidth is sitting - not a job however for the fainthearted)
