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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 of secondary mirror.
Low-scatter surface texture.

Our 3-vane spider design has 1/4 less total diffraction compared to 4-vane models. Bright field objects will appear to have six diffraction spikes spaced at 60° intervals, but the spikes are half as bright compared to a 4-vane spider (see diffraction comparison). The 3-vane mounts feature the same simplified collimation as the 4-vane models. 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:
4-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.

Secondary size (inch)

SKU

Price

Notes

0.75"

0753VALL

$95.00

For up to 13.5" tube (or upper cage) inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

1.00"

1003VALL

$95.00

For up to 13.5" tube (or upper cage) inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

1.30"

1303VALL

$105.00

For up to 15.0" tube (or upper cage) inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

1.50"

1503VALL

$110.00

For up to 18.0" tube (or upper cage) inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

1.52"

1523VALL

$110.00

For up to 18.0" tube (or upper cage) inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

1.83"

1833VALL

$116.00

For up to 18.0" tube (or upper cage) inside diameter. Specify your ID when ordering.

2.14"

2143VALL

$118.00

For up to 18.0" tube (or upper cage) inside diameter. Specify your ID when ordering.

2.60"

2603VALL

$132.00

For up to 22.0" tube (or upper cage) inside diameter. Specify your ID when ordering.

3.10"

3103VALL

$140.00

For up to 24.0" tube (or upper cage) inside diameter. Specify your ID when ordering.


NEW Secondary mounts (spider and mirror holder) for common imported ("GSO") mirror sizes.

These secondary mounts are not "drop-in" replacements for OEM spiders in imported telescopes, but the mirror holders fit common mirrors produced by Asian manufacturers. Many ATM-ers use these economical secondary mirrors in their projects.

Secondary size (mm)

SKU

Price

Notes

28.0

G02803V

$95.00

For up to 350 mm tube inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

31.0

G03103V

$95.00

For up to 350 mm tube inside diameter. Specify your ID when ordering. Anti-dew heater not available for this size.

46.5

G04653V

$116.00

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

50.0

G05003V

$118.00

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

62.5

G06253V

$122.00

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

63.0

G06303V

$122.00

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

68.0

G06803V

$132.00

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

70.0

G07003V

$132.00

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

74.0

G07403V

$140.00

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

80.0

G08003V

$140.00

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

Don't see a secondary mount for your mirror size? Contact us and we can supply a custom-sized holder. No more gluing mirrors!

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Protostar P.O. Box 368 New Albany, Ohio 43054 U.S.A. 614-375-3146
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