Solar AR's, filament and proms in Ha 27 Jan 2019

[Merlin66]

Bit better conditions, between the clouds this morning...
AR 2733 still showing well - there seems to be another smaller AR following..
Some nice small filaments and a few visible proms.
Something for everyone.
Images to follow.....
SM60/ED80/PST mod DS/ x2.5PM/ ASI 174

[Marke]

Looks great Ken certainly a bit more to see today

[SuperG]

Ken, were these taken with the PST and double stack? Really nice images.

By the way, how does one go about getting a second etalon for a PST?

[Merlin66]

No.
I basically used an external SM60 fitted to an ED80 but added a "PST Stage 2 mod" to the rear end at -200mm inside focus.
With the SM60 fitted up front, the effective system was a 60mm f10 ideal for the PST mod.
This arrangement then gave a 60mm DS H alpha scope.
Hope this helps.....

[Merlin66]

Re double stacking a PST....
The front 40mm etalon is available (SME 40)
https://www.highpointscientific.com/coronado-solarmax-ii-40mm-double-stacking-etalon-with-richview-tuning-filter-sme-40