| With
a clear opening of 95 mm, the BORG 101ED
is specially designed for medium format astrophotography. At the image
on the right you can see the BORG 101ED with the Medium Format Helical
Focuser
[8167]. Right behind the focuser ring, the focus lock knob can be seen
(there is one on each side of the focuser). The three thumb screws at
the end of the focuser hold the Pentax 6x7 Camera Mount [8567]. These
srews make it possible to fully rotate the camera for composition
without losing focus. The Mamiya 645 Camera Mount [8645] is screwed on the back end of the Pentax camera mount. |
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When
the BORG 101ED is used in the f/4-configuration, a special Super
Reducer Set [8044] must be inserted in the focuser of the telescope.
The set consists of two units of reducer lenses. Each unit contains two
lenses. One unit is screwed in front of the focuser, the other one
behind it. These units stay fixed in place, while the focuser tube
slides backwards and forwards.
The
back unit of the reducer set is threaded for filters (M72). At the
image on the left a Hutech IDAS Light Pollution Suppression (LPS)
filter
is inserted. For more information about LPS filters, visit the Hutech website.
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At the image
above, the hatch of the Mamiya M645 is opened and an exposed roll of
film (120 format) can be seen. A 120 film can take 15 exposures, which
is fine for a night of astrophotography. The empty spool must be saved
to use with a new roll of film. The big knob is used for transporting
the film and tensioning the shutter.
Using the Mamiya
M645 in
conjunction with the BORG 101ED, I encountered a problem: there is no
room for mounting a shutter release cable. A piece of LEGO came in
handy as you can see on the right.
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