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Features:

Thin vanes for low diffraction.
Unique simplified collimation procedure.
Carbon composite mirror shroud securely retains the mirror without strain.
Optional anti-dew heater available for most sizes.
Available for any size secondary mirror.
Ultra-black, low-scatter surface texture.

Protostar secondary mounts are professional quality optical mounts designed for the lowest possible diffraction, and simplified collimation adjustment. Optional features are available, and custom offsets can also be specified when ordering. Larger models feature special heavy-duty spider construction. Each secondary mount kit includes the spider, mirror holder, collimation tool, mounting screws and instructions. Made in the U.S.A.

Read how to order secondary mounts...

More detailed information about this product...

Detailed Product Images
(click to enlarge)

Download the installation instructions for secondary mounts.

See also:
3-vane secondary mounts.

Available Options
An anti-dew heater, built-in offset, and finger adjustable collimation are optional features you can have built in to your secondary mount. See more details...

We make the spider to fit your tube or upper cage's diameter with a small gap between the tips of the spider and the tube wall. This permits minor centering adjustments. Provide your actual inside diameter with your order.

More information on providing these dimensions is here.

Secondary mounts (spider and mirror holder) for common English sizes. Don't see your mirror size? Contact us and we can supply a custom-sized holder for no extra charge. No more gluing mirrors!

Direct replacement spiders for commercial telescopes. Simple replacement...no new holes needed in your tube.

Secondary size

SKU

Price

Notes

47.0 mm

GS081

$110.00

Direct replacement spider for GSO or Synta 8" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade)
This fits any GSO/Synta scope with f/5.9, 1200mm focal length, 47.0mm secondary mirror specs.

47.0 mm

GS081H

$150.00

Direct replacement spider for GSO or Synta 8" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade) with built-in antidew heater
This fits any GSO/Synta scope with f/5.9, 1200mm focal length, 47.0mm secondary mirror specs.

58.0 mm

GS082

$115.00

Direct replacement spider for GSO or Synta 8" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade)
This fits any GSO/Synta 8" scope with f/4.9, 1000mm focal length, 58.0mm secondary mirror specs.

58.0 mm

GS082H

$155.00

Direct replacement spider for GSO or Synta 8" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade) with built-in antidew heater
This fits any GSO/Synta 8" scope with f/4.9, 1000mm focal length, 58.0mm secondary mirror specs.

63.0 mm

GS101

$120.00

Direct replacement spider for GSO or Synta 10" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade)

63.0 mm

GS101H

$160.00

Direct replacement spider for GSO or Synta 10" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade) with built-in antidew heater.

70.0 mm

GS121

$135.00

Direct replacement spider for GSO or Synta 12" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade)

70.0 mm

GS121H

$175.00

Direct replacement spider for GSO or Synta 12" scopes (Aptura, Orion Skyquest, Zhumell Z-series, Hardin DSH, Celestron Starhopper, Meade) with built-in antidew heater.

72.0 mm

GS083

$135.00

Direct replacement spider for Explore Scientifc N208CF.
Advertised as either f/3.9 or f/4.0, 812 mm focal length, and a 72.0mm secondary mirror.

72.0 mm

GS083H

$175.00

Direct replacement spider for Explore Scientifc N208CF.
Advertised as either f/3.9 or f/4.0, 812 mm focal length, and a 72.0mm secondary mirror with built-in antidew heater.

4-vane spider assemblies for other sizes of mirrors. If you don't see your mirror size here, we can still make it for you.

1.50"

1504V

$122.00

For up to 450 mm tube inside diameter. Specify your ID when ordering. Anti-dew heater option not available for this size.

1.52"

1524V

$122.00

For up to 450 mm tube inside diameter. Specify your ID when ordering. Anti-dew heater option not available for this size.

1.83"

1834V

$126.00

For up to 450 mm tube inside diameter. Specify your ID when ordering.

46.5 mm

G04654V

$124.00

For up to 450 mm tube inside diameter. Specify your ID when ordering.

50.0 mm

G05004V

$128.00

For up to 550 mm tube inside diameter. Specify your ID when ordering.

2.14"

2144V

$128.00

For up to 550 mm tube inside diameter. Specify your ID when ordering.

62.5 mm

G06254V

$126.00

For up to 550 mm tube inside diameter. Specify your ID when ordering.

63.0 mm

G06304V

$126.00

For up to 550 mm tube inside diameter. Specify your ID when ordering.

2.60"

2604V

$138.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

68.0 mm

G06804V

$128.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

70.0 mm

G07004V

$140.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

74.0 mm

G07404V

$144.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

3.10"

3104V

$144.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

80.0 mm

G08004V

$150.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

3.50"

3504V

$184.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

88.0 mm

G08804V

$184.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

90.0 mm

G09004V

$184.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

4.00"

4004V

$205.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

104.0 mm

G10404V

$205.00

For up to 600 mm tube inside diameter. Specify your ID when ordering.

Sizes listed below are special heavy-duty construction models with wider/thicker vanes, larger spider hub, and other larger components. Carbon fiber construction secondary holder and spider hub. For tube/cage diameters up to 32".

4.50" HD

4504VHD

$290.00

Specify your cage ID when ordering. See more information.

120.0 mm

G12004VHD

$310.00

Specify your cage ID when ordering. See more information.

5.00" HD

5004VHD

$310.00

Specify your cage ID when ordering. See more information.

5.50" HD

5504VHD

$320.00

Specify your cage ID when ordering. See more information.

6.00" HD

6004VHD

$335.00

Specify your cage ID when ordering. See more information.


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