Baader Planetarium SUNDANCER II Manual page 10

The SunDancer II consists of two parts (plus the 1¼" eyepiece clamp). On the left is the actual H-alpha filter, i.e. the
etalon with the heating element and the micrometer screw. To the right, in the 3x telecentric system, the integrated
temperature of the lter must be increased (see section
"Calibrating the Filter"), and the half-width increases
to more than 1 Å instead of the usual 0.6±0.1Å, as
already mentioned. This will cause many details on the
solar surface to disappear. For best results, it is better
to stop down the telescope in front of the lens to f/8
or slower than to use the lter with arti cially enlarged
half-width. For this purpose we offer the stepless ad-
justable iris diaphragm 13-113 mm
elaborately white-painted blades so that no unnecessa-
ry heat is generated close to the lens. A simple, white-
painted baf e can easily be made yourself and attached
with Velcro in front of the D-ERF, for example, as in the
picture on the right.
Telescopes with a slower focal ratio can also be used,
but due to the longer focal length they quickly reach minimum magni cations that can
rarely be used during the day (due to air turbulence or exit pupil).
The telecentric of the SunDancer II also contains a blocking lter. It shimmers golden
when you look into the SunDancer from the telescope side. This block lter is absolu-
tely necessary to protect the actual H-alpha lter from solar radiation.
Although the telecentric system can be seperated from the etalon, the SunDancer II
must only be used in combination with the included telecentric system!
The modular design of the SunDancer II allows it to be used with other telecentrics
The 3x telecentric system
with integrated blocking
filter is only available com-
bined with the SunDancer II.
10
Manual: SunDancer II
block filter can be seen in the entrance opening.
(# 2459300). It has
(and an additional blocking lter!).
Attention: Using it with a telecentric without
this additional block lter would destroy the
etalon just as much as using it without D-ERF
on larger telescopes than 80 mm.
The 3x telecentric
available without blocking lter, e.g. for use on
other H-alpha lters. The blocking lter is not
available separately.
A 4x telecentric with integrated blocking
lter is planned in the long term, the existing
blocking lter of the TZ-3 must then be moun-
ted in the TZ-4.
A D-ERF can be stopped down with a
(# 4696070) is also
simple baffle
The 3x telecentric system
(# 1363070) without blo-
cking filter is also available
separately.