Bresser Messier AC 90/1200 Messier OTA

The longest refractor in the lineup: pure planetary contrast!

The Bresser AC 90/1200 Messier OTA is the specialist among optical tube assemblies. With an f/13.3 focal ratio, chromatic aberration is virtually eliminated, delivering the calm, high-contrast image for which long refractors are renowned: sharp lunar craters, the rings of Saturn, and beautiful double stars. The included solar filters also enable safe solar observation.

Long achromat, minimal color error

The 90 mm lens gathers about 165 times more light than the naked eye. With the 26 mm eyepiece, you view at 46x; use about 180x as a maximum. At f/13.3, the image remains clear even at that magnification. Only use the solar filters if they are undamaged and never look at the sun without certified protection.

Which mount fits this?

Note the long lever arm: the tube is lightweight but measures 1.2 meters. The Bresser EXOS-1/EQ-4 mount with tripod (379 euros) is sufficient for visual observation; the Bresser EXOS-2/EQ-5 mount on a tripod (539 euros) provides significantly more stability in windy conditions. Thanks to the Vixen-style dovetail, the tube fits on any mount with a standard Vixen clamp.

Included

• Achromatic optics 90/1200
• Integrated lens hood
• SP 26mm eyepiece (1.25 inch)
• 6×30 viewfinder
• 90 degree star diagonal
• Vixen-Style Split Rings
• Solar filters

Featured accessories

The Bresser Plössl 10 mm eyepiece (120x, 29 euro) is the core magnification for planets. An Omegon Premium moon filter (19.90 euro) subdues the bright moonlight.

For whom yes, for whom no

Pros: purists who want maximum planetary and double star contrast from a lens. Cons: those who want compact storage or to view deep-sky; the long tube and small aperture are not made for that. Compare on the refractor page. Meer Bresser is on the brand page.

Specifications