Baader Flip Mirror II Star Diagonal - BFM-II
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Baader Flip Mirror II Star Diagonal
Baader No. 2458055
The heart of the Baader BFM II is a precise surface-mirrored flip mirror with multi-layer Al coating, which can be used as any regular star diagonal for visual observations and for high-resolution images with cameras with small pixels. In addition, the BFM II lets you switch between a straight light path (Position A) for a camera or other measuring instruments and an angled light path (Position B), e.g. for an eyepiece. The following figure shows how it works. In addition, a calibration lamp for spectrographs or an Off-Axis-Guider pickoff-prism (that is not affected by the mirror position) can be connected at the AUX-port on the bottom. 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.
The Baader FlipMirror II Star Diagonal allows a variety of permanent adaptations to your telescope:
Use the rotary knob to switch between the rear port and the top port; you can use an optional toothed belt to operate it with a motor (not included). An autoguider or a calibration lamp can be connected to the bottom port.
Here's more info about the Baader-Flip Mirror II Star Diagonal (BFM II) ports:
- 1. Straight-through (S52, M48 and T-2 on both sides) for full-frame camera, spectrograph, or 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 (BFM-OAG) or for an optional calibration lamp for quick calibration of spectra without removing the spectrograph
The rotatable M48 connection rings are made of hardened, stainless steel on front and rear. They are adapted backlash-free to the BFM housing, so that they can be fixed in the optimum position to rotate any accessory around the optical axis. The BFM II is compatible with a large number of adapters from the Baader Astro T-2 system, the M48 system, and the UFC system (Universal Filter Changer).
What's In the Box
- Baader FlipMirror II Star Diagonal – with fine-optically polished, movable mirror
- Laterally adjustable T-2a top ring
- 2x M48i / S52 Dovetail ring # 2958552
- Reducing ring M48a / T-2i # 2958553
- Reducing ring M48a / T-2a # 2958554
- Inverter ring M48a / M48a # 2958555
- Pin type face wrench for M48 / T-2 and M4 counter nuts
- 3 mm screwdriver for M 4 brass adjustment screws
- 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 accessories are mounted by holding the wrench at an angle.
- Bottom flange (laterally adjustable 1mm) for off-axis guide or calibration lamp for spectroscopy
- Dust cap for bottom flange
- 2 x M48 dust caps
- T-2 dust cap
Specifications
- Inner Connection (Eyepiece to Camera): M48, D52
- Inner Connection (Lens Side): M42 * 0.75 (T-2), M48, S52
- Net Weight: 0.24 kg
- Optical Design: Mirror Diagonal
- Optical Length: 55 mm with S52, 59mm with M48/T-2
- Outer Connection (Eyepiece to Camera): M48