Sun Full disc 4-Sept-2017

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The Sun?
The Sun?
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Joined: Sun Jul 27, 2014 8:00 am
Location: Alpharetta, GA

Sun Full disc 4-Sept-2017

Post by Pegasus » Mon Sep 04, 2017 4:57 pm

Dear Friends,

Here is todays attempt to shoot with Omega 394NB filter combined with Meade Blue CCD filter. I am not sure whats problem but i am not able to see CaK features with this setup. I am using PST by removing ERF & Blocking filter. with ASI120MM i just get full disc on sensor.

I am guessing PST etalon must be transmitting in CaK / CaH wavelengths too, so adding 10nm Passband centered on 394 might help me to give better contrast, but unfortunately that don't seems to work, so i added Meade CCD blue filter which ~ cuts at 395, but still the resultant is same.

Anyways i am getting better resolution (i guess) with 40mm PST lens. here is the results, in past i had similar result with AT66 refractor with Badder ND5.
Sun 4-Sept 2017 / Coronado PST (by removing blocking filter & ERF) + Omega 394NB + Meade blue CCD filter + ASI120MM (exposure 8ms)+ Stacked 25% of 500 frames in AS!2 + processed in IRIS & FSViewer.
sun-4-sept-2017-Final.jpg (550.87 KiB) Viewed 858 times
ETX 90 + Badder ND5, Coronado PST, ASI120MM
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