Solar spectrum second light , much better today!

[Kitsunegari]

Changed up the system a bit and measured my TZ3 properly,  eliminated all focuser sag.  Let the TEC cooler sit for 30 mins before imaging.   No active regions for me to focus on to tell if i am on band or not, but i did get some much better surface detail today when the dial was set to 24.

Limb test for prominences

 

surface test 1 before the tec was cooled.

 

This is about 10 to 15mins of  cooling with the tec

 

this is 30 minutes after cooling

Edited September 17, 2021 by Kitsunegari

[Highburymark]

Wow - very impressive! Looks like you’ve got a great filter.

[Kitsunegari]

15 minutes ago, Highburymark said:

Wow - very impressive! Looks like you’ve got a great filter.

it certainly hits the home-run with prominence captures;  but i think the banding with surface detail is quite bad to my eye;  my modified LS50C etalon is a ton better unfortunately. 

 

 I would rate this etalon a 6 out of 10 for surface detail

 

 

I may have to run the etalon itself at F/60 to eliminate that dark stripe, and then use a focal reducer to widen the field a bit at the camera   (a true f//60 via 6x magnification,  not stopping down the objective)   

 

All the images are taken at f30 with a 3x baader telecentric.

 

 

The hard truth is that there really is a "lottery affect" on etalon0;  does not matter who made it.,  Only 1 in 10 people will get an 8 out of 10 quality etalon.     Only 1 in 50 will get a 10 out of 10 etalon.

[Highburymark]

That’s disappointing if that’s the case - in general there seems to be better uniformity and reliability with Solar Spectrum filters than Daystar, but no guarantees as you say. I had a Quark that was excellent for proms and poor on surface detail.