Farpoint 650nm Laser Collimator — 1.25" Barrel

Product Overview

The Farpoint 650nm Laser Collimator with 1.25" barrel handles the first step of Newtonian collimation: aligning the secondary mirror, then giving the primary a fast check. It is built for Newtonian and Dobsonian reflectors with standard 1.25" focuser drawtubes.

Every body is machined from a single piece of aluminum in one machining step, so the barrel and the laser axis stay concentric. An eight-screw alignment system locks both ends of the 650 nm diode with two sets of directly opposing screws. Farpoint makes it in the USA and guarantees the alignment for the life of the tool. A mirror center-marking template, triangle center spots and a carrying case are included.

Who It's For

This is a good match if your reflector has a 1.25" focuser — common on smaller Newtonians, tabletop Dobsonians and many imported reflectors — and you want collimation to be a thirty-second check rather than a chore. It works for a visual observer who wants to confirm alignment at the eyepiece before starting, and for an imager squaring the focuser axis before a run of long exposures. If you own a reflector with a 2" focuser, or a mix of both, the 1.25"/2" combo-barrel version covers them in one tool.

Key Features & Design

• 0.76 mm (30/1000") beam aperture: the smallest Farpoint publishes for any collimator on the amateur astronomy market. Less speckling, and a tighter return spot to read against the center mark.
• Eight-screw alignment system: two sets of directly opposing screws hold both ends of the laser diode, instead of the three-screw arrangement used in cheaper designs.
• Single-piece machined body: barrel and diode housing cut from one aluminum blank in one machining step, which keeps them concentric.
• 1.25" stepped barrel: seats in standard 1.25" focuser drawtubes.
• Extra-bright 650 nm red laser: readable at the focuser and on the primary without a white light.
• Protected switch: positive action, shielded by an aluminum ring.
• Red anodized aluminum body: rugged, and easy to find by red light.
• Lifetime alignment guarantee: Farpoint warrants the laser's alignment for the life of the tool.

Mechanical Design

A laser collimator's accuracy comes down to one relationship: the angle between the beam and the barrel that holds it. If the two disagree, every adjustment the tool suggests is wrong by that angle, and nothing about the tool's behaviour reveals it. Farpoint constrains this at both ends of the problem. Machining the barrel and the diode housing from one piece of aluminum in a single step eliminates the tolerance stack you inherit when a barrel is pressed or threaded into a separate body. The eight-screw mount then clamps the diode at both ends with directly opposing pairs, so it is held in compression rather than pushed against a spring or a single face — which is what keeps the alignment through handling, transport and the occasional knock.

The 0.76 mm aperture addresses the reading rather than the alignment. Laser light scattered from a mirror produces speckle, and a wide beam returns a large, noisy patch that is hard to centre against a mark. Narrowing the aperture tightens the returned spot so a small residual error stays visible.

Recommended Uses

• Secondary mirror alignment: the main task. The beam shows at once whether the secondary sits centred under the focuser and at the right tilt.
• Quick primary check: confirms the primary is close before a Cheshire refines it.
• Dark-site checks: the return reads by its own light, so a mid-session check costs no dark adaptation.
• After transport: a tabletop Dob or a Newtonian that has just come out of a car is worth checking before the first target.
• Before an imaging run: misaligned optics show up in the corners of a long exposure as coma and elongated stars.

Compatibility and Accessory Notes

• Focuser fit: 1.25" stepped barrel, for standard 1.25" focuser drawtubes.
• 2" focusers: this barrel does not fit a 2" drawtube. The Farpoint 1.25"/2" combo-barrel collimator covers both, and we stock it.
• Telescope types: Newtonian and Dobsonian reflectors. Refractors, catadioptric and SCT designs collimate by other means.
• Mirror center mark required: the laser aligns to a mark on the primary. The supplied template and triangle spots cover mirrors up to 12.5".
• Mirrors over 12.5": the LARGE center-marking template covers 12" to 26" and is sold separately.
• Pairs with a Cheshire: the Farpoint 1.25" Collimation Kit bundles this laser with a matching 1.25" Cheshire in a fitted case.

Good to Know Before You Order

• Reflectors only. Built for Newtonian and Dobsonian optics. For a refractor, SCT or Maksutov, get in touch and we will point you at the right tool.
• Check your focuser size first. This is the 1.25" barrel. If your drawtube is 2", the combo-barrel version is the one to order — and it fits both if you own two scopes.
• Your primary needs a center mark. The template and spots are in the box; marking a mirror is a one-time job.
• The supplied template fits mirrors up to 12.5". Larger mirrors take the LARGE template, which we also stock.
• A laser gets the primary close, a Cheshire finishes it. For visual work the laser alone is usually enough; for imaging, the pair is worth having.
• It is a laser. The beam is bright by design, and the usual care about not looking into it applies.

Frequently Asked Questions

Is it difficult to set up?

No. It drops into the focuser like an eyepiece and switches on. The one preparatory step is marking the centre of the primary mirror, and the template and spots for that come in the box — done once, the mark lasts the life of the mirror.

Will it fit my telescope?

If your reflector has a 1.25" focuser drawtube, yes. If it has a 2" drawtube, order the combo-barrel version instead, which steps to fit either. If you are not sure which your focuser is, send us the make and model and we will check.

What does the 0.76 mm beam aperture change in practice?

It tightens the spot that returns off the mirror. A wider beam comes back as a larger, speckled patch that is harder to judge against the centre mark; a narrow one returns a small spot, so a slight misalignment is still visible.

Do I need a Cheshire as well?

For a quick check before visual observing, the laser on its own does the job. For the last of the primary alignment — and for imaging, where the frame corners show every error — a Cheshire reads more precisely. The Farpoint 1.25" Collimation Kit pairs this laser with one.

What makes it different from an inexpensive laser collimator?

The single-piece machined body, the eight-screw diode mount holding both ends, and the 0.76 mm aperture. Each exists to keep the beam true to the barrel and the return spot readable, and Farpoint backs the result with a lifetime alignment guarantee.

Can I use it on an SCT or a refractor?

No — those designs collimate differently. Tell us what you have and we will point you at the right tool for it.

Bottom Line

In short: a USA-made 650 nm laser collimator with a 1.25" barrel, a single-piece machined body and an eight-screw diode mount, for Newtonian and Dobsonian reflectors with 1.25" focusers. It needs a centre-marked primary — the template is supplied — and it pairs with a Cheshire when you want the primary finished precisely.