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David Astro Cheshire - Long Style

David Astro Cheshire - Long Style

by David Astro
SKU DAV-CHES-1.25-L
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
Price Match Policy!
  • 1.25" barrel
  • Long style for secondary mirror placement
  • Passive tool, no batteries
  • For Newtonian reflectors
Only 3 left!
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  • Description
  • FAQ
  • Specifications
  • In the Box

  • David Astro Cheshire - Long Style

    The David Astro Cheshire - Long Style is a collimation eyepiece for Newtonian reflectors with a 1.25" barrel. It uses a peep hole and an angled reflective face lit by ambient light, so you can align your mirrors by eye.

    Passive Newtonian Collimation

    A Cheshire needs no power and has no laser to align. Light falling on its angled face is reflected down the tube, letting you see the primary mirror's centre mark against the Cheshire and judge alignment by eye.

    Long Style for Secondary Placement

    The long style adds a longer sight tube, which gives a tighter view of the secondary mirror and makes it easier to judge whether it is centred under the focuser, the first step of Newtonian collimation.

  • What is the David Astro Cheshire - Long Style used for?

    Collimating a Newtonian reflector: centring the secondary mirror under the focuser and aligning the primary mirror.

    Does it need batteries?

    No. A Cheshire is a passive tool lit by ambient light.

    Will it fit my focuser?

    It has a 1.25" barrel, so it fits 1.25" focusers, and 2" focusers with a 2" to 1.25" adapter.

    How do I use it?

    Insert the Cheshire in the focuser and look through the peep hole. Centre the secondary mirror under the focuser, then adjust the primary mirror screws until the reflection of the primary's centre mark sits centred on the Cheshire's reflective face.

    Long or short style?

    Both align the primary mirror. The long style's longer sight tube also helps with secondary mirror placement; the short style is more compact.

  • Brand David Astro
    SKU DAV-CHES-1.25-L
    Barrel size 1.25"
    Style Long

    • David Astro Cheshire - Long Style

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