Opticstar Off-Axis Guider

Enables a single telescope to be used for imaging and autoguiding.

  • Low profile 10mm optical path
  • Large aperture
  • 3-positions, 120-degree rotatable
  • Included: 2-inch nosepiece
  • Included: 10mm T-extension (M42 x 0.75)
  • Aluminium construction
  • UK warranty
Opticstar Off-Axis Guider
  • Product code: OAG
  • Availability: In stock
  • Despatch: 2 business days
  • Retail Price: £ 99.00
Shipping rates
England & Wales
£ 6.00
Scotland Central & South
£ 6.00
Scotland North
£ 6.00
Northern Ireland
£ 6.00
UK islands (from)
£ 6.00
Worldwide (from)
£ 15.00

Description

A high quality, low profile off axis guider compatible with the vast majority of imaging telescopes including Newtonian reflectors. The Kit consists of the actual Off-Axis Guider, a 48mm to 2-inch nosepiece (threaded for filters) and 10mm T-extension, such accessories are typically not included in competing products.

The Opticstar Off-Axis Guider has been designed to interface with the vast majority of existing imaging systems and does not require non-standard adapters, for example existing DSLR T-rings will do if you plan to use a DSLR camera. Sensors up to 39mm in diagonal can be accommodated, typical APS type DSLR sensors have a diagonal of around 27mm. Various adapters are available to attach the Off-axis Guider to a variety of cameras and telescopes in addition to the two such adapters included in the kit.


U.K. WARRANTY

ADVANCED

OPTICS

ASTRONOMY

PHOTOGRAPHY
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Advantages and disadvantages in using an off-axis guider

Auto-guiding with an Off-axis Guider has certain advantages as a separate guide scope is not required. This also reduces the weight the mount has to carry and eliminates possible flexure.

On the other hand, the range of suitable guiding stars will be reduced as the guide star will need to be within the field of view of the main scope which in turn will be relatively small. For example, when one compares the field of view of an 80mm F/5 refracting guide scope to an 8-inch F/10 SCT with an off-axis guider the 80mm refractor will have 5 times the field of view. However, you can overcome this by investing on a more sensitive guide camera. There is not really a better way but rather what better suits your circumstances.

Opticstar Off-Axis Guider connectivity.

A T-thread 10mm extension is supplied with the Kit. This serves a number of purposes and may be necessary to make the two cameras par-focal. It can be used to push the focal plane of the guide camera or imaging camera by 10mm away from the Off-axis Guider. Alternatively, it can be used to push a DSLR camera away from the Off-axis Guider because the camera’s flash-unit or handle may physically interfere with the Off-axis Guider or focuser knob of smaller aperture catadioptic telescopes including SCT and Maksutovs.

Off-Axis Guider specification

  • 10mm optical path.
  • Large free aperture (39 mm) on camera side, 45mm on telescope side.
  • Off-axis camera guide-port can be focused independently (0-15mm range).
  • 3-position, 120-degree rotatable design (imaging camera side).
  • Range of optional adapters available.

Included adapters

  • Telescope adapter 48mm(M) to 2" nosepiece, threaded for filters.
  • 10mm Camera T-extension (M42 x0.75).

Carries full one year UK warranty.

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Opticstar Off-Axis Guider
Attribute Specification
Product Code (SKU) OAG
Universal Product Code (UPC) n/a
Warranty 1 year UK warranty
Experience Level Advanced
Optical Path 10mm
Aperture • 45mm on telescope side
• 39mm on camera side
Included Adapters • 48mm to 2-inch nosepiece (threaded for filters)
• 10mm T-extension (M42 x0.75)
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