Instruction Manual
Baader CCS Herschel-Prism
Copyright Baader Planetarium GmbH, all rights reserved
-
8
-
Baader 340 nm / 10 HBW Solar Continuum Filter
(included in delivery)
The
Solar Continuum filter
is a true narrowband filter featuring
10nm half-bandwidth (HBW) at the passband of 540nm at the
same time supplying maximum spectral transmission. This has
following advantages for Solar observation:
Most achromatic doublet objectives used in Astronomy are not
corrected equally well across the full visual spectrum (actually
they have a noticeable color error). For such lenses the Solar
Continuum filter isolates the very spectral range where these ob-
jectives are well corrected. This will yield best possible contrast
and sharpness for economy refractors: All other colors are com-
pletely eliminated. This narrowband filtering (brightness is no
problem) results in a much higher contrast of the sun's surface,
and you can use much higher magnifications.
Additionally, Solar granulation is most contrasty in that very spec-
tral range around 540nm.
At the same time, the Baader Solar Continuum filter greatly improves seeing conditions by supplying a steadier
Solar image because the short portion of the Solar spectrum below 535nm is being blocked (thermally induced
seeing effects become less prominent with longer wavelengths of light).
When using apochromatic (fully color corrected) APO-refractors (e.g. Astro Physics, TEC, Zeiss) the Solar Contin-
uum filter may be removed, in order to observe the Sun in integral white light with the same contrast as is only
achievable using the Solar Continuum filter when observing with ordinary achromates.
