Instruction Manual
Baader CCS Herschel-Prism
Copyright Baader Planetarium GmbH, all rights reserved
-
6
-
2.2.
Photographic version
(# 295 6500
P
):
-
Baader Safety Herschel-Prism with 2" nosepiece and 2" Baader ClickLock
®
eyepiece clamp
-
#2458332 2" Neutral Density Filter OD 3.0 (1:1000, transmission 0.01%),
-
#2458391 2" Baader Solar Continuum filter
-
additional one of each 2" Neutral Density filters, OD 0.6 (#2458321), 0.9 (#2458322) and 1.8 (#2458331).
The Baader Solar Continuum- and the Neutral Density filter OD 3.0 are pre-mounted into the prism-body in the as-
delivered-condition.
3.
THE OPTICAL PATH WITHIN THE SAFETY HERSCHEL-PRISM
The graphic below shows the optical path within the Baader Safety Herschel-Prism. The Solar light enters into the
prism body from the right and falls onto the 45
° inclined first prism surface. Approx 4.6% of Solar light are being
reflected into the eyepiece or camera respectively. The much larger percentage of light (95.4%) exits the rear face
of the prism and would form a focal point outside of the prism body.
The exiting beam in the Baader Safety Herschel-Prism is fed into a separate
“
heat cage
”
which is sealed with a
special heat-absorbing ceramic tile. Like on a space shuttle the ceramic tile traps the radiant energy without over-
heating its surroundings. The body of the Baader Safety Herschel-Prism is closed on all sides which prevents any
danger of contacting direct Sunlight, making it safe for educational work. Since the
“
heat cage
”
is separated from
the prism body and only connected with four screws, there is virtually no heat distribution extended into the prism
itself.
The translucent ceramic tile also acts as projection screen
showing an unfocused image of the Sun. Aiming the tele-
scope at the Sun is now esier than ever before.
The 2" ClickLock
®
clamp securely clamps any 2" eyepiece
or 2"/1
¼
“
reducer with only the small rotation of a lever.
You can change eyepieces with only one hand even in win-
ter with heavy gloves.
IMPORTANT ADVICE:
Due to production standards, the 2" nosepiece in front of
the Baader Safety Herschel-Prism features a 2" (M48) filter
thread. However - never attempt to mount any 2" filter in
front of the Herschel-Prism! Any filter mounted into the full
beam of Solar energy so near to the focus will become ex-
tremely hot and will be damaged within seconds (see safety
advice, page 3). Each and every filter must be mounted
above the exiting side of the prism.
The pre-mounted filters in the prism body
(also see 4.6)
Both versions of the Baader Safety Herschel-Prism (visual and
photographic) are equipped with two 2" filters mounted above
the exiting side of the Herschel-Prism. Mounted directly above
the prism is a 2" Solar-Continuum filter (#2458391), with the
strongly reflecting surface facing the prism. Above that
–
i.e.
directly in front of the eyepiece or camera
–
a neutral density
filter OD 3.0 (1:1000) #2458332 serving as energy reducer.
This orientation of filters ensures a Solar image free of un-
wanted reflections.
The Illustration to the right exemplifies the filter arrangement.
Direction pointing to-
wards the Herschel
Prism
Solar Continuum filter
Neutral density filter OD
3.0
2" threaded ring with M48
filter thread
To the eyepiece
4.6% reflected light
towards the eyepiece
Entering
beam of light
Ceramic tile (Solar
finder screen)
95.4% of light
exiting unused
