4317
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This is Borg's most economical helical focuser
and the only model with a rotating movement.
This model is useful as a supplemental visual
focuser to a coarse rack pinion focuser or an
SCT focuser which causes image shifts.
Attachment is via a metric M36.4 P1.0 male thread
or M35.8 P0.75 female thread,
but with the addition of Borg adapter 7316 it
may be inserted directly into a 1-1/4" eyepiece
sleeve. The 7316 adapter also includes threads to
hold an eyepiece filter.
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Index
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none
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Length
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38mm to 52mm (14mm travel)
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Weight
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60g
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Front interface
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M36.4 P1.0 Male
M35.8 P0.75 Female
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Rear interface
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31.7mm (1 1/4" eyepiece) Sleeve
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7315
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This is a deluxe version of 4317. This
non-rotating helical focuser includes index
marks. This focuser works well for fine
focusing for CCD cameras, digital still cameras
and video cameras as well as for visual use.
The front interface is a metric M36.4 P1.0 Male
thread, or a 1-1/4" eyepiece interface with
the use of adapter 7316 (includes threads for
31.7mm eyepiece filters). The rear interface
includes a T-thread so that it may be connected
directly to SBIG's CCD cameras.
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Index
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50 microns
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Length
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50 to 60 mm (10 mm travel)
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Weight
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80 g
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Front interface
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M36.4 P1.0 Male
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Rear interface
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31.7mm (1 1/4" eyepiece) Sleeve
M42 P0.75 Male
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7757
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This is Borg's shortest helical focuser and
includes a variety of adapters providing a very
wide range of interface options. Its short
length is useful in accomodating accessories
with long focus requirements such as diagonals
and binoviewers. This focuser is recommended
only for visual use because the short focuser
does not include a locking screw.
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Index
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none
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Length
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22 TO 32 mm (10 mm travel)
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Weight
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50 g
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Front interface
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M57 P0.75 Male
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Rear interface
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M57 P0.75 Female
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7835
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This focuser is provided as the standard focuser
for a Series 80 scope. Borg adapter 7428 allows
this focuser to be attached to an SCT.
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Index
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80 microns
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Length
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63 to 82 mm (19 mm travel)
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Weight
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320 g
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Front interface
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M68.8 P0.75 Male
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Rear interface
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M60 P0.75 Male
M57 P0.75 Female
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7837
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This is a heavy-duty version of the 7835 focuser.
It has three locking screws and operation is smoother
even when supporting the attachment of heavy
accessories such as cameras or binoviewers.
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Index
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80 microns
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Length
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63 to 82 mm (19 mm travel)
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Weight
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320 g
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Front interface
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M68.8 P0.75 Male
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Rear interface
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M60 P0.75 Male
M57 P0.75 Female
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7841
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This focuser is basically designed
to be used with 42mm screw
mount lenses and cameras. But since
it is relatively short compared to other
focusers, it is also useful with telescopes
when other focusers don't allow for sufficient
inward travel.
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Index
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none
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Length
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27mm to 47mm
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Weight
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110g
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Front interface
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M42P1.0 female
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Rear interface
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M42P1.0 male
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7842
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This focuser is basically designed
to be used with 42mm screw
mount lenses and cameras. But since
it is relatively short compared to other
focusers, it is also useful with telescopes
when other focusers don't allow for sufficient
inward travel.
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Index
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none
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Length
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15mm to 25mm
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Weight
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80g
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Front interface
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M42P1.0 female
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Rear interface
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M42P1.0 male
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7857
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This focuser has a versatile front end
interface (M57 P0.75 Male) which allows
connection to a wide variety of Borg accessories
including adapters (7901, 7910, 7911 and 7912)
for third-party scopes. This allows connection
with Vixen and Takahashi focuser sections. The
internal diameter (47mm) is wide enough to
cover 35mm format film.
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Index
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100 microns
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Length
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49 to 65 mm (16 mm travel)
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Weight
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165g
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Front interface
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M57 P0.75 Male
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Rear interface
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M57 P0.75 Female
M60 P0.75 Male
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8167
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This is the largest focuser in the Borg helical
focuser family, fully covering up to a 6x9
format film frame. It is recommended for use
with Series 115 and 140 scopes.
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Index
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80 microns
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Length
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115 to 146 mm (31 mm travel)
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Weight
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830 g
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Front interface
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M95 P1.0 Female
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Rear interface
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M89 P1.0 Male
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7754 &
7838
- Series 80 tube / focuser accessories
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Series 80 tube accessories:
- 7754 -
Drawtube with mm graduated scale makes it easy
to easily set rough focus position.
- 7838 -
Focuser wheel goes over focuser rings for
smoother focus adjustments and easier gripping
when using gloves.
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