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BRESSER Messier AR-90s/500 EXOS-1/EQ-4

Telescope with 90mm f/5.5 lens, includes mount and tripod

High quality basic refractor telescope

Lens diameter: 90mm / focal length: 500mm / f/5.5

EXOS-1 equatorial mount with load capacity of up to 7 kilos

Perfect for the moon, star clusters and the milky way.

Large field refractor telescope

Scope of supply: telescope, mount, tripod, accessories

Telescope for night and solar observation.

Solar lens filter and smartphone adapter included for navigation

With integrated camera mount (photo threaded screw)

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Entrega entre 12 y 18 días laborables

NEW: Now includes a high-quality lens solar filter for safe viewing of sunspots, eclipses, and planetary transits. A high quality telescope for night and solar observation.

Great for getting started in astronomy - the 90mm aperture offers over 200 times more light than the naked eye!

See craters, valleys and grooves on the moon almost 400,000 km away as if you were really close! The BRESSER MESSIER AR-90s with EXOS I mount offers you detailed images, but not only of the moon: Take a close look at the division of Saturn's rings from millions of kilometers away or discover the "Great Red Spot" of Jupiter , a massive hurricane in its atmosphere. Follow the seasons on Mars and detect the crescent of Venus.

But the AR-90s also does a very good job as a compact travel device. Due to the shorter focal length of just 500mm, impressive wide-field observations of open star clusters and the Milky Way can be made.


The MESSIER AR-90s already collects a multiple of light compared to the device with which Galileo Galilei made his famous discoveries almost four hundred years ago.

The permanently installed dew protection cap reduces any dew formation that may occur and prevents side stray light from entering, also increasing image contrast.

There is a GP dovetail bar on the ring of the AR-90s/500 tube to attach it to the mount.


Type: lens telescope

Lens diameter: 90mm / Focal length: 500mm / F/5.5

Maximum useful magnification: 180x

Telescope for night and solar observation.

6x30 viewfinder with crosshair eyepiece

Optimized Viewfinder Stand for Comfortable Viewing

31.7 mm (1.25'') star diagonal

Smartphone adapter included for celestial navigation

With integrated camera mount (photo threaded screw)


Stable equatorial mount with fine adjustment on both axes

Circular bubble for easy horizontal alignment

Stable, height-adjustable stainless steel tripod

Can be retrofitted with a tracking motor for the right ascension axis

Polar height scale to set latitude

Scaled pitch circle rings to make it easier to find objects using a star atlas or planetarium software

Tripod Weight: 4.7kg

Mounting weight: 4 kg (without counterweight)

Total weight including counterweight: 10.7 kg


optical tube

26mm (31.7mm / 1.25") Super Plössl eyepiece

31.7 mm (1.25") star diagonal

rotating star map

sun filter lens

Finder telescope 6x30

Smartphone adapter for navigation

Stellarium PC astronomy software (via download)

1 counterweight of 2 kg

EXOS-1 equatorial mount with stainless steel tripod

Technical Data

Field of application
  • Deep Sky Observation
  • Lunar observation
  • Lunar photography
  • Planetary observation
  • Solar observation
Focus Group
  • Beginners
  • Visual enthusiasts
  • Advanced Amateurs
Product Family Refractor telescope
Optical design Achromatic Refractor
Maximum recommended magnification 180
Mirror/Lens diam. 90 mm
Focal length 500 mm
Aperture ratio 5.5
Angular resolution 1.53 arc seconds
Type of coating Fully multi-coated
Material OTA Aluminium
Material tripod3 Stainless Steel
Eyepiece Barrel Diameter 31.7 mm
Mount Type German/Equatorial Mount
Extended warranty 10 years
Net weight OTA (incl. accessories) 1.9 kg
Total length 100 cm
Total width 100 cm
Total height 160 cm
Net weight mount (incl. accessories) 4 kg
Net weight tripod (incl. accessories) 4.7 kg
Counterweight 2 kg

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