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Borg Focusers


4317

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.

Index   none
Length   38mm to 52mm (14mm travel)
Weight   60g
Front interface   M36.4 P1.0 Male
M35.8 P0.75 Female
Rear interface   31.7mm (1 1/4" eyepiece) Sleeve


7315


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.

Index   50 microns
Length   50 to 60 mm (10 mm travel)
Weight   80 g
Front interface   M36.4 P1.0 Male
Rear interface   31.7mm (1 1/4" eyepiece) Sleeve
M42 P0.75 Male


7757

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.

Index   none
Length   22 TO 32 mm (10 mm travel)
Weight   50 g
Front interface   M57 P0.75 Male
Rear interface   M57 P0.75 Female


7835

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.

Index   80 microns
Length   63 to 82 mm (19 mm travel)
Weight   320 g
Front interface   M68.8 P0.75 Male
Rear interface   M60 P0.75 Male
M57 P0.75 Female


7837

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.

Index   80 microns
Length   63 to 82 mm (19 mm travel)
Weight   320 g
Front interface   M68.8 P0.75 Male
Rear interface   M60 P0.75 Male
M57 P0.75 Female


7841

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.

Index   none
Length   27mm to 47mm
Weight   110g
Front interface   M42P1.0 female
Rear interface   M42P1.0 male


7842

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.

Index   none
Length   15mm to 25mm
Weight   80g
Front interface   M42P1.0 female
Rear interface   M42P1.0 male


7857


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.

Index   100 microns
Length   49 to 65 mm (16 mm travel)
Weight   165g
Front interface   M57 P0.75 Male
Rear interface   M57 P0.75 Female
M60 P0.75 Male


8167

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.

Index   80 microns
Length   115 to 146 mm (31 mm travel)
Weight   830 g
Front interface   M95 P1.0 Female
Rear interface   M89 P1.0 Male


7754 & 7838 - Series 80 tube / focuser accessories

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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