WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO
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, Touptek 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 |
