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© Baader Planetarium GmbH | 2019
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Manual: FlipMirror II
The Off-Axis-Guider
mounted under the BFM II.
The prism is visible in the
housing, under the mirror.
same way. Both models were sold in high
numbers and may be purchased second-
hand at a very good price.
The prism is always below the
mirror so that it can also
be used when the mirror
is down, e.g. to guide a
planetary camera con-
nected to the upper port.
When the mirror is up,
the camera at the rear
port should be aligned
in such a way that the
prism is under the long
side of the sensor.
When using an Off-Axis-Guider, you need to match its focal
point to that of eyepiece and camera. This can be done with
(variable) extension tubes for camera/eyepiece, or with DT-
4-sleeves for an autoguider camera as described in the
"
Focusing
" section on the next page.
The
back of the mirror is also aluminised and masked
, to
bring, for example, the light of a calibration lamp to a spec-
trograph at the rear port. The aluminium-multicoating of the
mirror with its dielectric protective coating ensures a strict
separation of both light paths.
Attaching a filter changer
The BFM II can be combined with the Baader UFC Uni-
versal Filter Changer, or with other filter changers which
provide S52, M48 or T-2 connections.
To mount the Baader UFC
behind
the BFM II, you will
need either the UFC M48 camera-adapter
# 2459116
or the S52 dovetail Camera-Adapter for Wide-T-rings
# 2459119
. To
use the S52-
adapter, you will
need to remove
the M48-ring
as described above by loosing the four small
grub screws.
To mount the BFM II
in front of
the UFC, you
can equip the UFC base unit with the UFC
S70 / M48 (f) Telescope-Adapter
# 2459129
.
Its female M48 thread fits to the male M48-
thread of the BFM II.
Cross Hair Eyepieces:
• Polaris I – Measuring- and Guiding-Eyepiece,
25mm, T-2, illuminated
# 2954325
, for direct adapta-
tion to a T-2-thread, or with optional 1¼" nosepiece
# 2458105
• Baader Micro Guide Eyepiece with Log-Pot illumina-
tor
# 2404300
You can also use the T-thread on the top port to attach
a
bino-viewer
(with a glasspath corrector), if there is
enough back focus and and if you find a comfortable
viewing position. This is especially interesting for lar-
ger telescopes with Nasmyth- or Coudé-focus!
Attaching an Autoguider, a calibration
lamp or other accessories to the bottom port
There is a third port
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at the bottom of the FlipMirror, where you can attach e.g. the
pick-up-prism of an autoguider or a calibration lamp for a spectrograph. You can attach
accessories either via the three screw holes (M 3,
15 mm radius) or with the three locking screws at
the side of the 19mm large adapter plate.
You can attach the
Off-Axis-Guider for Baader
FlipMirror II (BFM-OAG)
# 2956951
directly to the
FlipMirror. You only have to remove the included
small spacer ring (as shown in the image to the
left), so that the prism is fully inserted into the light
path of the BFM II.
Then simply remove the lower dust cap from the
lower port of the BFM II, loosen the three lateral
hexagon socket screws (see photo), slide the BFM-
OAG into the port and tighten the screws again. The
Guider has a tilting prism for easier adjustment of a
guide star. Please note that the vertical side of the
prism must face the telescope.
The BFM-OAG is also part of the
Off Axis Guider for
RCC (RCC-OAG)
# 2956950
. To use this item with
the BFM II, you will need to remove the unit with the
pick-up prism from the T-2-ring as described on the
next page; then you need to remove the spacer ring
from the pick-up prism exactly as with the Off-Axis-
Guider for BFM II. As described above, you can then
insert the prism unit into the BFM II and lock it with
the three screws. Remember that the vertical side of
the prism must face towards the telescope.
The old
Celestron Radial Guider
#94176
– which
is no longer in production – can be attached the
Another option:
Attaching a bino-viewer with a glasspath
corrector.
To use the pick-up prism of the Baader Off Axis Guider
for RCC (left) or of older Celestron Radial Guiders, you
first need to remove the T-2-sleeve by opening screw
1. Now loosen the the screws 2 to remove the spacer
ring (grey arrow), and reattach the prism unit again at
the eyepiece clamp. Screw 3 is used to tilt the prism.
2
1
3
The UFC can be mounted on both
sides of the BFM II
The UFC with a 50x50 filter slider, which requires a
only a minimum of space when the UFC is attached
directly to the BFM II
The adapter flange at the lower plate. The
red arrows mark the locking screw for
a pick-up prism. Loosen the larger hex
screws to temove the flange, e.g. to adapt
a calibration lamp. You can also see the
masked mirror inside of the BFM II.
The Off-Axis-Guider for Baader FlipMirror II.
Here, the spacer ring (right) has already
been removed. (# 2956951)
