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© Baader Planetarium GmbH | 2019
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Manual: FlipMirror II
Baader FlipMirror II star diagonal
Various Ports, Variable Work
Congratulations on your purchase of the Baader FlipMirror II (BFM II) star diagonal.
This compact, versatile and configurable flip mirror offers more options than our previ-
ous model, as well as other competing units. In this manual we want to present some
of its possible uses. The most important features of the BFM II are:
• Three connecting ports:
1. Straight light path (S52, M48 and T-2 on both sides) for full-format cameras,
spectrographs and other instruments
2. Adjustable T-2 thread on top for eyepiece clamps, video modules (up to 32 mm
image circle) or even a binoviewer
3. Bottom flange for the optional Off-Axis-Guider for Baader FlipMirror II (BFM-OAG)
# 2956951
or for an optional calibration lamp for quick calibration of spectra wit-
hout removing the spectrograph
• Precise surface-mirrored flip mirror with multi-layer Al coating, for high-resolution
images with cameras with small pixels
• The back of the flip mirror is also Al coated and masked to direct the light of an
optional calibration lamp onto the slit of a spectrograph.
• Enables precise adjustment of all light paths
• Shortest possible overall length for any application – compatible with a large num-
ber of adapters from the Baader Astro T-2 system, the M48 system and the UFC
system (Universal Filter Changer)
• Rotatable M48 connection rings made of hardened, stainless steel on front and rear,
backlash-free adapted to the BFM housing. Can be fixed in the optimum position to
rotate any accessory around the optical axis.
• Prepared for an optional toothed belt for
motorization (e.g. by Steeldrive II Control-
ler) – basic requirement for image acquisi-
tion, guiding and spectroscopy in remote
observatories
BFM II with DADOS-
spectrograph and
CCD-camera – no other
flip mirror can carry such
a heavy load (with such
a lever) without bending,
which would ruin the
precise measurements.
Technical Data
SKU #
2458055
Connections
S52, M48, T-2
Material
Aluminium, stainless steel
Mirror Material
Multilayer aluminium coating
with dielectric protective layer
Optical Pathway
55 mm with S52
59 mm with M48/T-2
Weight
195 g
Dimensions
(with all adapters)
63 x 77 x 69 mm
Scope of Delivery
of the Baader FlipMirror II (BFM II)
1. Baader FlipMirror II – with fine-optically polished, movable mirror
2. Laterally adjustable T-2a top ring
3. 2x M48i / S52 Dovetail ring made of hardened stainless steel
# 2958552
4. Reducing ring M48a / T-2i
# 2958553
5. Reducing ring M48a / T-2a
# 2958554
6. Inverter ring M48a / M48a
# 2958555
7. Pin type face wrench for M48 / T-2 and M4 counter nuts
8. 3 mm screwdriver for M 4 brass adjustment screws
9. 4x hex keys (2.5 / 2.0 / 1.5 / 1.3 mm).
The 2.0 mm wrench has a ball head to reach screws even when accesso-
ries are mounted by holding the wrench at an angle.
10. AUX-port bottom flange (laterally adjustable 1mm) for off-axis guide or
calibration lamp for spectroscopy
11. 19 mm dust cap for AUX-Port
12. T-2i dust cap
13. M48a dust cap
14. 2 x T-2a dust caps
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