Vixen M80 I picked up from eBay ready for Solar duties.
Replacement TS 86mm focuser.
Altair Astro 152mm D-ERF (energy rejection filter) removes most of the harmful radiation.
The KG3 removes heat from around 800nm-2200nm:
Schott KG3 transmissionThe UV/IR is really there to stop the 25mm Edmund Optics filter falling out of the 1.25" nosepiece. But no harm in adding more safety nets.
A good quality O-ring inside the 1.25" nose presses down on the EO filter to keep it firmly in place against the UV/IR glass.
Edmund Optics 0.5nm (5 angstrom) Ha filter acts as the "blocking filter" by allowing through just a small range of light centered around 656.3nm:
EO 0.5nm HaThe Baader TZ4S telecentric gives the Lunt 40 etalons nicely parallel rays of light.
The 2x Lunt 40 etalons are from the front of 2x Lunt LS40THa scopes.
Each has a red ERF at the front and a tilt etalon inside.
These etalons are mirror-like on both faces so internal reflections and "multiple suns" when rear-stacked are an issue.
A circular polarizing filter between the two etalons is said to help. This could be put in a T2 filter drawer between them.
This would reduce transmission by half.
The red ERF from each Lunt could be removed to regain transmission AS LONG AS YOU'VE THE REQUISITE
ENERGY FILTERING IN PLACE UPSTREAM.
Not so shouty for imaging only, but for visual you don't want to fry an eye.
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