Center Marking Kit LARGE · 12"–26"
Mark the exact center of a big primary mirror from 12" to 26" — the essential first step before collimation can begin.
The Farpoint Primary Mirror Center Marking Kit with LARGE template is designed for big Newtonian and Dobsonian primary mirrors from 12" to 26" diameter. Accurate collimation depends on knowing exactly where the center of your primary mirror is; without a proper center mark, your laser collimator and Cheshire eyepiece have no reference point — you are guessing instead of aligning. On large mirrors, even small centering errors are amplified, making a precise center mark even more critical.
Specifications
Mirror size
LARGE template — accommodates primary mirrors from 12" to 26" diameter
Template
Large acetate center-marking template, precision-cut for 12"–26" primary mirrors
Targets
8 triangle center-mark targets; triangle edges touch the outside of the illuminated field through a Cheshire, removing the guesswork of centering a round dot
Compatibility
Newtonian & Dobsonian reflectors only
Where it fits in the workflow
Center mark (you are here) → Laser → Cheshire
Center marking is the preparation step that comes before any optical alignment tool. Once your large mirror is marked, your laser and Cheshire finally have a reference point to align to.
New to collimation? Start with our preparation & center-marking guide (Layer 1), browse the full How to Collimate hub, and download the CORE and COMPLETE reference PDFs. For the "why" behind it all, see our complete Telescope Collimation Guide.
Complete your collimation toolkit. A center mark is just the starting point. Pair it with a Farpoint Laser Collimator (the essential first step for secondary alignment and rough primary alignment) and a Cheshire Eyepiece (the critical second step for final, precise primary alignment), or grab a bundled Collimation Kit. Smaller mirror? See the standard kit (up to 12.5").
Frequently Asked Questions
Why does center marking matter on a large mirror?
Accurate collimation depends on knowing exactly where the center of your primary mirror is. Without a proper center mark, your laser collimator and Cheshire eyepiece have no reference point, so you are guessing instead of aligning. On large mirrors, even small centering errors are amplified, making a precise center mark even more critical.
What size mirror does the LARGE kit fit?
The large template accommodates big primary mirrors from 12 inches to 26 inches in diameter. For smaller mirrors up to 12.5 inches, see our standard center marking kit.
What is in the kit?
A large acetate center-marking template precision-cut for primary mirrors from 12 inches to 26 inches in diameter, plus 8 triangle center-mark targets. The triangle edges touch the outside of the illuminated field when viewed through a Cheshire, removing the guesswork of centering a traditional round dot.
Will this work on my SCT, Maksutov, or refractor?
No. This center marking kit is for Newtonian and Dobsonian reflecting telescopes only. It is not intended for refractors, catadioptric, or SCT designs.
Start big-mirror collimation the right way
Mark your mirror, then align with confidence.
Shop Collimation ToolsHow to Collimate Your ScopeFor Newtonian and Dobsonian reflecting telescopes only. Not intended for refractors, catadioptric, or SCT designs.
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