Corvane Cairn alt-az mount, with carbon fiber 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

Each configuration of the Corvane Cairn alt-az mount uses the same mount head; the options change what it stands on and what ships with it. The carbon fiber tripod saves weight for travel while still damping vibration well at moderate magnification. Carbon fiber legs stay comfortable to handle on cold nights, since they conduct less heat away from your hands than metal. A weather cover suits observers who keep the mount outdoors on a pier or a covered patio.

The titanium gray finish has a hard anodized layer that resists wear on the clamp surfaces. The 2023 edition uses the same gears and bearings as later years, with small differences in the clamps. 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
• Carbon fiber tripod with accessory tray
• Fitted weather cover

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.