Tessaro Lumen 127 Maksutov-Cassegrain, tube with equatorial mount

Specifications

Description

The Lumen 127 is a Maksutov-Cassegrain telescope with a 127 mm aperture and a 1,500 mm focal length, folded into a tube about 35 cm long. The focal ratio of f/11.8 favors high magnification, which makes the Lumen 127 a good match for the Moon, the planets, and double stars.

A Maksutov uses a thick meniscus corrector at the front and a spherical primary mirror at the back. The secondary mirror is an aluminized spot on the inside of the corrector, so there is no spider and no diffraction spikes on bright stars. The optics are fixed at the factory and rarely need collimation.

With a 10 mm eyepiece the Lumen 127 reaches 150x, and a 6 mm eyepiece gives 250x on nights of steady air. At those magnifications Jupiter shows its belts, festoons, and the shadows of its moons, Saturn shows the Cassini Division, and the Moon shows small craterlets inside larger craters. Close double stars such as Porrima and Izar split cleanly.

The long focal length gives a narrow field. Large objects such as the Pleiades or the Andromeda Galaxy do not fit in the field, so the Lumen 127 is less suited to wide deep-sky views than a short refractor or a Newtonian. Small bright targets such as the Ring Nebula and globular clusters work well.

Focusing moves the primary mirror inside the tube, which gives a long focus range for cameras and diagonals. The thick corrector needs time to cool, about 30 to 45 minutes on a cold night. At 3.5 kg, the tube rides on light mounts and suits apartments and travel.

About this configuration

This listing covers one specific configuration of the Tessaro Lumen 127 Maksutov-Cassegrain, defined by its bundle, finish, accessory kit, and edition year. The equatorial mount follows the sky along one axis once you align its polar axis with the celestial pole. Balancing the tube and the counterweight before each session helps the equatorial mount move smoothly in both axes. The carbon fiber tube expands less as the temperature drops, so the focus point drifts less as the night cools.

This configuration comes without extra accessories, so budget for at least one more eyepiece if you are starting out. The optics in the 2024 edition match the other years; the changes concern hardware details only. The optical figures in the specifications table apply to this configuration and to every other version of the Tessaro Lumen 127 Maksutov-Cassegrain.

What's in the box

• Optical tube with dust cap
• Vixen-style dovetail bar
• 90-degree star diagonal (1.25 in)
• Red-dot finder
• Equatorial mount with steel tripod
• Counterweight and counterweight shaft

Compatibility notes

• The rear port takes 1.25 in diagonals and eyepieces; a 2 in diagonal needs an adapter for the rear thread.
• The Vixen-style dovetail bar fits most small alt-az and equatorial mounts.
• Planetary cameras attach with a 1.25 in nosepiece or the rear T-thread.