Bresser AC 102S/600 Messier Hexafoc Refractor OTA

Description

Cooling down fast enough for a spontaneous session, the Bresser AC 102S/600 Messier Hexafoc Refractor OTA runs at f/5.9, the kind of short-tube ratio built for rich star fields rather than tight planetary close-ups. This version ships as a bare optical tube: no mount included, riding on a universal Vixen-style dovetail that fits most mounts already sitting in a hobbyist’s garage without needing an adapter plate.

At 3.9kg, this tube needs a mount rated for at least 6kg once an eyepiece and diagonal are attached — check that before ordering if you’re pairing it with something you already own. The integrated piggyback camera mount on the tube rings means it can also ride alongside a larger primary telescope for wide-field guiding, and the 2.5-inch Hexafoc focuser holds a 2-inch diagonal steady even with a moderately heavy eyepiece attached, something lighter focusers in this catalog can struggle with under the same load.

Key Features of Bresser AC 102S/600 Messier Hexafoc Refractor OTA

A 102mm achromatic objective in a short-tube configuration resolves down to 1.14 arcseconds, reaching a limiting magnitude of 11.8 for genuinely bright wide-field views.

• 102mm aperture at f/5.9 gathers light fast for rich, wide star fields
• 2.5-inch Hexafoc heavy-duty focuser holds a diagonal and eyepiece steady without slipping
• 2-inch zenith mirror accommodates larger 2-inch eyepieces for wider true fields
• Integrated piggyback camera mount lets this tube ride alongside a second scope
• 6×30 optical finder scope speeds up target acquisition before switching eyepieces
• Included 26mm Super Plossl eyepiece delivers 23x magnification right out of the box
• Magnification range from 15x to 200x covers wide fields through planetary detail

What Sets the AR-102S/600 OTA Apart

Every mounted version of this same 102mm optical tube shares identical optics — this OTA-only version exists purely for buyers who already have a compatible mount. The 2-inch zenith mirror here also outsizes the 1.25-inch mirror on the smaller AT-3 budget variant in this line, worth noting if wide-field eyepiece compatibility matters more to you than saving on initial cost.

Applications & Use Cases

Built as a short-tube assembly for rich-field deep-sky observation, this telescope also suits highly portable grab-and-go tracking setups for an observer building a second rig around gear they already own.

• Observers who already own a mount and just need the optical tube
• Anyone building a second, portable wide-field rig around an existing mount
• Buyers who want the 2-inch eyepiece format the budget AT-3 variant lacks

Bresser Warranty & Support

The AR-102S/600 OTA carries a 2-Year Factory Warranty covering manufacturing defects, handled directly through Bresser’s support channel.