Corvane Cairn alt-az mount, with steel tripod

Specifications

Description

The Cairn is a light alt-azimuth mount for small refractors, short reflectors, and spotting scopes with a payload of up to 4 kg. It moves in altitude, up and down, and in azimuth, side to side, so you aim it the way you would aim a camera on a tripod. The center-post head is compact, which keeps setup short when you carry the mount to a park, a balcony, or a campsite.

A single fine-adjust rod on the altitude axis lets you nudge the tube up and down without touching the optics. The azimuth axis has no rod, so you turn the head by hand. Tension knobs on both axes set how freely the mount moves. Tighten them for steady views at high power, and loosen them when you want to sweep quickly across a star field or follow a planet across the sky.

The universal dovetail saddle accepts bars up to 40 mm wide, which covers most small refractors and Maksutov-type telescopes. A locking screw holds the bar in place while you loosen the main clamp to rotate the tube, so the optics stay seated. The head weighs 2.5 kg and has a standard 3/8-16 thread underneath for photo tripods.

Telescopes up to about 70 mm in aperture and 1.2 kg work best on the Cairn. Heavier or longer tubes fit within the 4 kg payload but take longer to settle after you focus. As a rule, keep the total load, including a diagonal, eyepiece, and finder, well below the rated payload.

The Cairn has no motors and does not track the sky. At low and medium power that is rarely a problem, because most objects stay in the field for a minute or two. It suits short observing sessions where setup time matters more than tracking.

About this configuration

The Corvane Cairn alt-az mount is sold in several configurations, and the notes below describe what this particular one includes. The steel tripod gives a heavy, stable base that damps vibration quickly after you touch the focuser. A steel tripod adds weight to carry, but it settles fast when the wind picks up during a session. A padded case makes it easier to carry the mount head to a dark site without knocks to the axes.

A white mount head is easy to see in the dark, which helps you avoid walking into the tripod. This is the 2025 edition, which enlarged the clutch knobs so you can operate them with gloves on cold nights. The payload rating in the specifications applies to the mount head in every configuration of the Cairn line.

What's in the box

• Alt-az mount head with universal dovetail saddle
• Fine-adjust rod for altitude
• Accessory tray
• Steel tripod with accessory tray
• Padded carrying case

Compatibility notes

• Accepts dovetail bars up to 40 mm wide.
• The 3/8-16 base thread fits most photo tripods; a 1/4-20 adapter is included.
• Suits telescopes up to about 70 mm aperture and 1.2 kg for steady views.