© Baader Planetarium GmbH | 2020
9
inverter-ring
# 1508020
. This ensures a permanent
and very sturdy eyepiece adaptation and saves
about 45 mm of optical length (the closer distance
even results in a slightly larger field of view, in
case you are using a Schmidt-Cassegrain optics).
Filters
The Mark IV zoom eyepiece allows you to use
both 1.25" and 2" filters because each of the two
nosepieces has got a filter thread. So you can
also use 1.25" filters when using the eyepiece on
a 2" eyepiece clamp. Please note that for space
reasons it is not possible to use both 1.25" and
2" filters at the same time.
Filters cannot be used on spotting scopes either.
This would make the overall length too long, and
the spotting scope could no longer be focused to infinity.
Connection options for spotting scopes
Spotting scopes with integrated 1¼" eyepiece
These spotting scopes in most cas-
es do not offer a lot of backfocus.
Accordingly it is necessary to insert
any eyepiece as deeply as possible
into the 1¼" clamp of the spotting
scope to reach infinity focus. Many
eyepieces will fail at this operation
since their field stop position is
not optimized for use at spotting
scopes. On the Mark IV simply re-
place the telescope adapter „B“ against the spotting scope adapter „A“, as described
on page 5, to gain almost 4 mm in backfocus compared to most other eyepieces.
Then re-attach the 1¼" nosepiece onto the adapterring „A“, to use the Mark IV with
spotting scopes like the Zeiss Conquest Gavia or the Celestron Regal M2, the Hum-
mingbird or TrailSeeker (image).
Mark IV without filters
Mark IV with 1¼" filter
Mark IV with 2" Filter
