Telecompressor; Afocal Photography - Baader Planetarium SUNDANCER II Manual

The already mentioned 0.4x telecom-
pressor 2" (# 2459260)
photographically. If the telecompressor
is adapted to T-2 as described before,
its ideal working distance is still 73.5
mm. A DSLR or system camera with
a standard T-ring has a ange focal
distance of 55 mm. The remaining 18.5
mm can be bridged with T-2 extensions,
e.g. as in the picture on the right with
• TQC/TCR Heavy duty T-2 Quick
Changing System
optionally additionally
• 3x T-2 ne-adjustment ring (1 mm – gold) made of aluminium
• T-2 adjustment/spacer-rings (set of 15)
The distance does not have to be kept exactly, but the compression factor changes
with the distance.
Astronomical cameras can also be connected via the T-2-thread; you can nd the
required back focus in the documentation of your camera.

Afocal Photography

Finally, the possibility of photo-
graphing with the camera through
the eyepiece should be mentioned
– even if this option combines the
worst of both worlds: a large lens
stack and a colour camera. This
makes it more of a feasibility study,
but it may offer the chance to pho-
tograph the entire sun even with
a smaller camera sensor without
having to buy a telecompressor. If
you see the entire sun in the eye-
piece, you can capture the image with a camera – ideally even with your smartphone.
Better is a camera whose xed focal length lens has a lter thread that can be connec-
ted to the M43 thread of our Hyperion and Morpheus eyepieces via our Hyperion-DT
rings. For this you need a lens that you bring as close as possible to the objective
without the lenses touching each other. The objective focal length depends on the size
of the solar image in the eyepiece.
In practice, the method has some disadvantages and is only useful with xed focal
length lenses; however, if you already have a suf ciently short focal length lens, it can
temporarily be an alternative to buying a full-frame camera or a telecompressor.
The telecompressor delivers much better results and is much easier to use, at a com-
parable price to a xed focal length lens.

Telecompressor

can also be used
# 2456322 – 15 mm,
Even this possible in principle: an MFT camera with a 12mm lens
overlooks almost the entire field of view of a Hyperion 36mm
A DSLR with 0,4x telecompressor and T-2 quick-changer
# 2458102
eyepiece.
© Baader Planetarium GmbH | 2021
# 2457913 or
23