As an unstacked single filter, it shows the finest solar details in calcium-K
(Cak) Light.
For photography of the sun only in conjunction with enclosed
AstroSolar photo film ND3.8 or separately available
Herschel prism.
Increased contrast, matched to typical CMOS quantum efficiency and
s/n ratio.
Reflex blocker coatings, for maximum insensitivity
against retro reflection from the nearest auxiliary optics, even under
most adverse conditions ? with sealed coating edges.
Identical filter thickness to existing standards, with the utmost care
Regarding. Homofocality.
Filters individually finely polished and coated, with
sealed coating edge.
Delivery includes AstroSolar photo foil ND 3.8, format: 200 x 290 mm
to pre-filter sunlight.
The Calcium Filter Gen-II must NOT be in the beam path WITHOUT pre-filtering.
be used.
A visual observation is not possible with the calcium filter, because
the eye is practically blind in this spectral range. Set up
never use the telescope only with the calcium filter (without additional
attenuation filter) directly into the sun