AstroBin

AstroBin

AstroBin

Ed Astle

EdAstle

About

UK based occasional photographer/astronomer.
My avatar is from the 2006 solar eclipse in Türkiye.

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Double Stack Banding Issues A collection by Ed Astle

*Introduction*

I was getting uneven brightness across my DS Ha images in the form of light/dark vertical bands.
I'm not talking about the Newton Rings - they turned out to be interesting.
This was not noticeable through an eye piece.
Neither of the Lunt40 etalons was tilted.

To investigate this in a repeatable fashion I bought a "LED Video Light Panel".
Photographers use them for lighting up their subjects.
I had no idea if it would output anything around 656.3nm, so it was a gamble.
Mine cost £49.99 - "RALENO LED Video Light, 192 LEDS".

*Summary*
Rotating (aka 'clocking') one etalon relative to another can help image evenness.
Aligning each of the Lunt40 tilt wheels helped - this may be coincidence.
Clouds have prevented any imaging since I posted these images.

Work in progress...

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