© 2023 Baader Planetarium GmbH
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1.5 mm in daytime), you may see the shadow of the secondary mirror as a dark spot,
and the distance of the eyepiece to the reducer must be maintained for it to work as
desired. Therefore, a long focal length eyepiece is easier to handle for visual use than
a reducer.
Typical long focal length eyepieces give you:
Classic Ortho 32mm
1
¼"
– # 2954132
Hyperion 36mm
1
¼"
(2") – # 2454636
Celestron Omni 40mm
1
¼"
– # 810246
Celestron Omni 56mm
2
"
– # 810248
Mag. | EP | FoV
Mag. | EP | FoV
Mag. | EP | FoV
Mag. | EP | FoV
TriBand C8
190x | 1 mm | 0.26°
166x | 1,2 mm | 0.3° (0.43°)
152x | 1,3 mm | 0.28°
109x | 1,9 mm | 0.43°
TriBand C9¼
220x | 1 mm | 0.22
195x | 1,2 mm | 0.25° (0.37°)
176x | 1,3 mm | 0.25°
126x | 1,9 mm | 0.37°
TriBand C11
262x | 1 mm | 0.2°
233x | 1,2 mm | 0.21° (0.31°)
210x | 1,3 mm | 0.21°
150x | 1,9 mm | 0.31°
EP = Exit pupil | FoV = Field of View
The field stop of the Hyperion 36 in 1¼" configuration is 32 mm, providing the largest
field of view achievable with 1¼". The field stop of a typical long focal length 1¼" eye-
piece is a maximum of about 26 mm, that of a 2" eyepiece about 45 mm.
The achievable field of view is determined both by the diameter of the field stop of
the eyepiece and that of the H-alpha filter; a longer eyepiece focal length or a 2" nose-
piece therefore do not necessarily also provide more field of view.
Example Configuration for SolarSpectrum H-alpha-Filter – Bino-Viewer
1
TriBand Schmidt-Cassegrain with SC-thread
2
# 2958243
Baader Ultrashort 2"/ 2" Thread-Inverter-Ring, included with the TZ-3
3
# 2459257
2" Research Grade TZ-3 Telecentric System (3-times extension of the
focal length),
4
# 2958244
Baader Reducing-Ring 2"i / T-2a, with 1.5 mm optical length, included
with the TZ-3 – to attach SolarSpectrum-Filters with T-2-thread. Not needed for
SolarSpectrum-filters with female SC-thread.
5
SolarSpectrum-Filter with T-2-threads. Filter with SC-thread can
be attached directly to the telecentric system, without
4
6
# 1508035
Baader Adapter 2" (male) / T-2 (male) – only for
SolarSpectrum-filters with female SC-thread, included with the
SolarSpectrum-filters
7
# 2456322
Baader TQC/TCR Heavy duty T-2 Quick Changing System
1
2
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7
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