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AstroSystems Dobsonian Telescopes, Telescope Accessories and Parts

AstroSystems - Secondary Mirror Cells

1/4 inch Secondary Mirror Holders

AstroSystems is the largest supplier of secondary holders and spiders to the astronomical community.   There
are no tools needed to adjust holders of 2.6 inches or larger in minor axis size; they come standard with
thumbscrews.  Holders from 2.1 inches and smaller are supplied with a hex key that gives positive seating in
the hex screw even in the dark.  All sizes feature our innovative four screw/two-axis adjustment that greatly
simplifies collimation.   With a four screw adjustment, each screw is centered between the spider vanes,
making collimation adjustments a snap.  Two nuts with nylon washers position the holder laterally and also
allow easy adjustment of the rotation.  The secondary mirror is held securely yet safely against the front lip
of the aluminum bezel with polyester batting.  Available in 19 sizes, ranging from 1.3 inch to 7.0 inch.  Use
the link below for dimensions, exact weight and sizing.

AstroSystems - 1.30 inch Secondary Holder - 1/4 inch shaft with 3/8 inch adapter

$ 29.00

AS_SH_1.30

AstroSystems - 1.36 inch Secondary Holder - 1/4 inch shaft with 3/8 inch adapter

$ 30.00

AS_SH_1.36

AstroSystems - 1.52 inch Secondary Holder - 1/4 inch shaft with 3/8 inch adapter

$ 31.00

AS_SH_1.52

AstroSystems - 1.83 inch Secondary Holder - 1/4 inch shaft with 3/8 inch adapter

$ 32.00

AS_SH_1.83

AstroSystems - 2.00 inch Secondary Holder - 1/4 inch shaft with 3/8 inch adapter

$ 33.00

AS_SH_2.00

AstroSystems - 2.14 inch Secondary Holder - 1/4 inch shaft with 3/8 inch adapter

$ 35.00

AS_SH_2.14

3/8 inch Secondary Mirror Holders

AstroSystems is the largest supplier of secondary holders and spiders to the astronomical community.   There
are no tools needed to adjust holders of 2.6 inches or larger in minor axis size; they come standard with
thumbscrews.  Holders from 2.1 inches and smaller are supplied with a hex key that gives positive seating in
the hex screw even in the dark.  All sizes feature our innovative four screw/two-axis adjustment that greatly
simplifies collimation.   With a four screw adjustment, each screw is centered between the spider vanes,
making collimation adjustments a snap.  Two nuts with nylon washers position the holder laterally and also
allow easy adjustment of the rotation.  The secondary mirror is held securely yet safely against the front lip
of the aluminum bezel with polyester batting.  Available in 19 sizes, ranging from 1.3 inch to 7.0 inch.  Use
the link below for dimensions, exact weight and sizing.

AstroSystems - 2.50 inch Secondary Holder - 3/8 inch shaft

$ 39.00

AS_SH_2.50

AstroSystems - 2.60 inch Secondary Holder - 3/8 inch shaft

$ 39.00

AS_SH_2.60

AstroSystems - 3.00 inch Secondary Holder - 3/8 inch shaft

$ 42.00

AS_SH_3.00

AstroSystems - 3.10 inch Secondary Holder - 3/8 inch shaft

$ 43.00

AS_SH_3.10

AstroSystems - 3.50 inch Secondary Holder - 3/8 inch shaft

$ 46.00

AS_SH_3.50

AstroSystems - 4.00 inch Secondary Holder - 3/8 inch shaft

$ 50.00

AS_SH_4.00

AstroSystems - 4.25 inch Secondary Holder - 3/8 inch shaft

$ 56.00

AS_SH_4.25

AstroSystems - 4.5 inch Secondary Holder - 3/8 inch shaft

$ 60.00

AS_SH_4.50

AstroSystems - 5.0 inch Secondary Holder - 3/8 inch shaft

$ 68.00

AS_SH_5.00

AstroSystems - 5.5 inch Secondary Holder - 3/8 inch shaft

$ 73.00

AS_SH_5.50

AstroSystems - 6.0 inch Secondary Holder - 3/8 inch shaft

$ 78.00

AS_SH_6.00

AstroSystems - 6.25 inch Secondary Holder - 3/8 inch shaft

$ 83.00

AS_SH_6.25

AstroSystems - 6.5 inch Secondary Holder - 3/8 inch shaft

$ 88.00

AS_SH_6.50

AstroSystems - 7.0 inch Secondary Holder - 3/8 inch shaft

$ 94.00

AS_SH_7.00

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