Astronomy Specialist

WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO

$799.00
SKU: WO-M-GS61-GD

William Optics

Apochromatic doublet

1.44 kg


Color: Gold

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The William Optics GuideStar 61 is an apochromatic guide scope with a focal ratio of f/5.9 and a focal length of 360mm. Utilizing FPL-53 synthetic fluorite glass, the GuideStar 61 provides excellent aberration correction.

The GuideStar 61 is compatible with QHY, ZWO and many other guide cameras (Note: some guide cameras may require an extra 2" extension tube to reach focus). The locking dew shield focuser allows you to easily reach the correct focus point. An extension tube is included to help reach focus with different cameras. The CNC-machined finder-style dovetail base is compatible with all William Optics saddle handles.

The GuideStar 61 can also be used as a widefield imaging telescope with the optional Flat61A field flattener.

Note: As the Flat61 an adjustable flattener, you must adjust the distance for your specific telescope. See the Instructions tab above.

Specifications

 

Optical design

Apochromatic with FPL-53 lens

Objective diameter

61 mm

Focal length

360 mm

Focal ratio

f/5.9

Compatible flattener

William Optics Flat61A

Mount attachment

Vixen-style sliding-base

Focuser

Screw-type focuser

Camera connection

M54 x 0.75, 2"

Tube weight

1.44 kg

SKU

WO-M-GS61-GD (Gold), WO-M-GS61-RD (Red)

 

Included items

 

  • GuideStar 61
  • Finder sliding-base
  • M54 to 2" adapter
  • Extension tube
  • Soft carry case
Instructions

 

Note: Once you have unscrewed the rear adapter to the appropriate value in the table below, the remaining backfocus distance to make up will be 55mm from the rear M48 thread.  

Distance adjustment needed for correct backfocus

Zenithstar 61 12.9 mm
Guidestar 61 12.9 mm

 

WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO.

WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO

$799.00

Color

Optical design

Apochromatic doublet

Image circle

43 mm with Flat61A

Focal ratio

f/5.9

Aperture

61 mm

Focal length

360 mm

Optical thickness

Threads

M54 x 0.75 Female, 2" barrel

Cooled

Colour or Mono

Pixel size

Sensor dimensions

Resolution

Sensor diagonal

Quantum efficiency

Read noise

Fullwell capacity

Bit depth

FPS

Camera backfocus

Filter size

Filter size

Bandpass (FWHM)

Bandpass (FWHM)

Glass thickness

Mount type

Payload capacity

Latitude range

Dovetail saddle

Slew speed

Encoders

Periodic error correction

Counterweight shaft

Azimuth adjustment range

Internal diameter

Illuminated diameter

Compatible telescope external diameter

Weight

1.44 kg

Length

Width

Height

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