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ULS Quartz secondary mirrors

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Secondary mounts FAQ

Optional features for straight-vane secondary mounts

Straight-vane Protostar secondary mounts can be ordered with optional features to enhance their functionality.

With the optional built-in anti-dew heater, your secondary mirror will remain dew-free all night long. The spider vanes conduct the electricity, so there are no wires to thicken the spider vanes. A red LED power indicator is recessed into the front face to prevent stray light from interfering with imaging.

The anti-dew heater requires a DC power source that you supply. When operated at full voltage (~12v DC), the heater will clear existing dew in about fifteen minutes. The heater can also be used in a "preventative mode" (i.e., turned on before dew forms) with as little as 4 volts.

The anti-dew heater is available for 4-vane, 3-vane, and Cassegrain secondary mounts with secondary sizes of 1.83" or larger. Includes supplemental instruction sheet.


Price (US$)

Anti-dew heater option for any size secondary mount

add $45.00

For secondary offsets greater than 0.1" (2..5mm), it can be built into the spider by shortening and lengthening opposite vanes. When ordering this option, specify both the offset amount and the orientation (see image to the right)


Price (US$)

Built-in offset


This kit replaces the standard collimation set screws with finger-adjustable screws. They work for both straight-vane and curved secondary mounts. The thumbscrews feature fully-threaded aluminum shafts, and are custom designed and tooled for Protostar secondary mounts. Made in the U.S.A.


Price (US$)

Finger adjustable collimation screws for 1.52" to 2.48" (63.0mm) secondary mounts.


Finger adjustable collimation screws for 2.60" to 3.54" (90.0mm) secondary mounts.


Finger adjustable collimation screws for 4.00" and larger heavy-duty secondary mounts.


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