Astro-Tech 100mm Folding Pier

At high magnification, what holds your mount matters as much as the mount itself. A tripod — even a solid one — introduces flex at the joints and resonance in the legs. A pier column eliminates both. The Astro-Tech 100mm Folding Pier is machined from T6061 aluminum alloy, 100mm in diameter, braced folding legs, rated to 220 lb — built to behave like a small observatory wherever you set it up.

The 100mm (3.9″) pier column is machined from T6061 aluminum alloy with stainless-steel hardware throughout. That large-diameter tube handles torsional flex better than a conventional tripod center, and the braced folding legs deploy wide and stay planted. Height adjusts from about 900mm (35.4″) to 1000mm (39.4″) — enough range to keep the mount at a comfortable working position without sacrificing rigidity, and enough clearance for longer tubes and extended imaging trains near the meridian. Despite the structure’s solidity, it folds down compactly; the carry weight is about 8.5 kg (18.7 lb), and a padded transport bag is included.

Once you’ve observed on a solid pier, going back to a lightweight tripod is a real step backward. The pier doesn’t give you anything dramatic — it takes things away: the flex when you grab the focuser, the oscillation when the mount slews, the low-frequency bounce that works through a long imaging train. At high magnification, on fine planetary detail or a tight double star, the absence of movement is what lets you actually see what you came to see. The pier settles quickly after focusing, stays composed when the mount is adjusted, and keeps the image quiet — which is the whole point.

Rated to 220 lb, the pier handles refractors, SCTs, and heavier imaging setups without stress. It’s also the right foundation for giant binoculars in the 70–120mm class when paired with an appropriate mount. Rather than designing your setup around a fixed tripod, the pier becomes the constant — the one part of the system that serves you however the optics evolve.

Setup: deploy the legs, lock them, level the base, attach your mount. The system then behaves like a small observatory — steady and predictable, with none of the small mechanical uncertainties that interrupt a session.

What’s in the Box

• Astro-Tech 100mm folding pier
• Padded transport bag

Features

• 100mm T6061 aluminum pier column — large-diameter tube resists torsional flex; stainless-steel hardware throughout
• Adjustable height: 900–1000mm (35.4–39.4″) — field-practical range for most mount and optical tube combinations
• Rated to 220 lb — structural margin for refractors, SCTs, and imaging setups; no flex under load
• Braced folding legs — wide deployed stance; compact folded footprint for transport
• Net weight ~8.5 kg (18.7 lb) — manageable to transport; padded carry bag included
• Suits telescopes and giant binoculars — appropriate for refractors, SCTs, and 70–120mm binoculars with alt-az or EQ heads

Frequently Asked Questions

What mounts are compatible with the Astro-Tech 100mm Folding Pier? — The pier has a wide footprint and 220 lb rated capacity, making it compatible with most alt-az and equatorial heads used with refractors, SCTs, and imaging setups. Confirm your mount's base plate dimensions against the pier's top plate before ordering.

Can I use this pier for giant binoculars? — Yes. The Astro-Tech 100mm Folding Pier is well suited to giant binoculars in the 70–120mm class when paired with an appropriate binocular mount such as the Sky Rover U-Mount Fork.

How does this compare to using a heavy-duty tripod? — A pier column is inherently more rigid than a tripod at equivalent height because it eliminates the flex points where tripod legs meet the head. The 100mm column diameter handles torsional flex that a tripod center section cannot. The difference is most noticeable at high magnifications and during long imaging sessions.

Does the pier fit in a car for transport? — Yes. The folding leg design packs down compactly, and the included padded carry bag makes it straightforward to transport in most vehicles. At 8.5 kg it's manageable without additional equipment.