Corvane Cairn alt-az mount, head only

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. This configuration is the mount head alone, so you supply a tripod or a pier with a matching top plate. Buying the head only makes sense when you already own a sturdy tripod or a permanent pier in the garden. The fitted weather cover keeps dew and dust off the mount if you leave it set up between sessions.

Titanium gray anodizing shows dust less than black and keeps a uniform look over the years. This is the 2023 edition of the Cairn line, the earliest version that is still listed in the catalog. Check the saddle type in the specifications against the dovetail bar on your telescope before you choose a configuration.

What's in the box

• Alt-az mount head with universal dovetail saddle
• Fine-adjust rod for altitude
• 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.