ORION SKYQUEST XT-SERIES NEWTONIAN

We offer knobs for the Orion SkyQuest XT-series secondary only, since the primary already has factory knobs. The secondary assembly can have three different configurations. Select the correct configuration for your telescope from the list below by using our photos and guidelines.

A. Knobs for Orion SkyQuest XT-Series (6”, 8”, 10”, 12”, 16”) Primary

The Orion SkyQuest XT-series primary is equipped with factory collimation and lock knobs. Although the lock knob is small, its proximity to the collimation knob prevents replacing it with a larger knob. Therefore we do not offer replacement primary collimation or lock knobs.
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B. Knobs for Orion SkyQuest XT-Series (6”, 8”, 10”, 12”, 16”) Set Screw Secondary

Part: CNsec30 or CNsec35
Fits: Orion SkyQuest XT-series with factory set-style secondary collimation screws. This is the most common XT-series secondary.

Secondary Characteristics: 4-vane spider, a deeply recessed center screw, and factory headless set (grub) collimation screws. The secondary plate holding the screws is about 20 mm (3/4”) thick. This is a very common Newtonian secondary configuration.

Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

Notes:
  1. We offer knobs with screws having either 30 mm or 35 mm length. Order knobs with a screw length sufficient to allow the knobs to clear the secondary housing, which is usually 30 mm. This is the most common XT secondary configuration.

$20.95

Screw length
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C. Knobs for Orion SkyQuest XT-Series (6”, 8”, 10”, 12”, 16”) 4-Vane Phillips Screw Secondary

Part: CNsec25 or CNsec35
Fits: Orion SkyQuest XT-series with factory long Phillips secondary collimation screws. This configuration is not as common as the set-screw secondary.

Secondary Characteristics: 4-vane spider, a deeply recessed center screw, and factory Phillips collimation screws. The secondary plate holding the screws is about 20 mm (3/4”) thick.

Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

Notes:
  1. The factory collimation screw length, measured below the head, can be either 25 mm or 32-35 mm. Order knobs with the correct screw length for your application, which is usually 35 mm. This secondary is somewhat rare on the XT-series.

$20.95

Screw length
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D. Knobs for Orion SkyQuest XT-Series (6”, 8”, 10”) 3-Vane Phillips Screw Secondary

Part: CNsec25
Fits: Early Orion SkyQuest XT series

Secondary Characteristics: 3-vane spider, a shallow recessed center screw, and factory Phillips collimation screws. The secondary plate holding the screws is about 6 mm (1/4”) thick.

Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel

$20.95