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Dovetail bars

Sky-Watcher Star Adventurer ball head adapter (S20550)

A green ball head adapter for the Star Adventurer, listed with two different post lengths both labelled 3/8 inch.

Sky-Watcher Star Adventurer ball head adapter in green

Sky-Watcher Star Adventurer ball head adapter (S20550)

A green ball head adapter for the Star Adventurer, listed with two different post lengths both labelled 3/8 inch.

Profile
Not published by the maker.
Length
Not published by the maker.
Hole spacing
Not published by the maker.
Slots
Not published by the maker.
Material
Neither is published
Thickness
The listing gives “0.95 cm (3/8 in)” in one bullet and “1.9 cm (3/8 in)” in another; both are reproduced
Safety stops
Not published by the maker.
Accessory holes
Attaches a ball head to the Star Adventurer
Amazon reference
B00YWPCNJU (same reference on 6 Amazon marketplaces)
EAN
0050234205504
  • The part that makes a photographic ball head usable on a tracker
  • Made by the manufacturer of the mount
  • Two different post lengths are given for the same fitting

Best for: Putting a photographic ball head on a Star Adventurer

≈ $18 / £22
Check price on Amazon

Specifications

Profile
Not published by the maker.
Length
Not published by the maker.
Hole spacing
Not published by the maker.
Slots
Not published by the maker.
Material
Neither is published
Thickness
The listing gives “0.95 cm (3/8 in)” in one bullet and “1.9 cm (3/8 in)” in another; both are reproduced
Safety stops
Not published by the maker.
Accessory holes
Attaches a ball head to the Star Adventurer
Amazon reference
B00YWPCNJU (same reference on 6 Amazon marketplaces)
EAN
0050234205504

A star tracker turns at sidereal rate; a ball head aims a camera. This adapter joins them, with a threaded post that a standard photographic head screws onto.

The figures that disagree

One bullet gives 0.95 cm and calls it 3/8 inch — which is correct, since 3/8 of an inch is about 9.5 mm. Another gives 1.9 cm and also calls it 3/8 inch — which is 3/4 of an inch. Both are printed above, and this page does not choose between them.

Why 3/8 rather than 1/4

Because a ball head carrying a camera and a telephoto lens needs the larger thread. ISO 1222 defines both; the smaller one is for phone clamps and light accessories, and the larger for anything that has to stay put under load.

The blanks in the listing

Material, weight, and the actual length of the post. For a part whose whole function is a thread, the last of those is the one that matters.

Availability

German, French, Italian and Spanish Amazon stores ran from 29 € to 34 € on the day of the survey.

American and British Amazon stores list it in local currency, which the euro range above sets aside.

Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.

Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.

What this fits

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