Bresser Messier 12″ Dobson

The new Bresser Messier 12″ Dobson offers a large 305 mm parabolic primary mirror, 2.5″ HEX focuser and great portability due to its very lightweight GRP fiberglass telescope tube. Compared to a 10-inch Newtonian, the 305-millimeter aperture optics offer 1.4 times the light gathering power and a 0.1 arcsecond improvement in resolution and the fast focal ratio ensures a bright image.

Bresser Messier 12" DobsonThe large 2.5″ HEX focuser with rack and pinion drive has an aperture of 65 mm so there is no noticeable obstruction from the focuser tube even with large wide-field eyepieces.  Thanks to the large altitude wheels, even these heavier eyepieces are held effortlessly. And if a particularly large number of accessories are attached, such as a binocular attachment, then the entire tube can be moved inside the tube clamps and everything is balanced again.

The rigidity of the focuser makes astro photography with this tube also possible. To take images, simply unscrew the altitude wheels from the tube and attach it to an equatorial mount using a dovetail bar. An optional 10:1 gear reduction for the focuser is also available.

A 6×30 finder and a 25 mm SPL eyepiece are included, and various other viewfinder types can also be retrofitted using the two supplied new hybrid viewfinder shoes.

For transportability, the rocker box can be dismantled in a few simple steps because the parts are assembled with metal quick-release connectors. This quickly turns a bulky rocker box into a handy flat package of individual parts. The Bresser Messier 12″ Dobson package also includes a high-quality objective solar filter for safe observation of sunspots, eclipses and planetary transits.

The new Bresser Messier 12″ Dobson specifications include:

– Type of build: Newtonian reflector

– Aperture (mm): 305mm

– Focal length: 1,525mm

– Aperture ratio: f/5

– Theoretical resolving power: 0.45 arcseconds

– Visual limiting magnitude: 14.5 mag

– Light gathering capacity: 1,900

– Maximum useful magnification: 610x

– Primary mirror diameter: 12″ (305 mm) parabolic main mirror

– Primary mirror Material: PZ33

– Secondary mirror diameter: 72mm

– Secondary mirror obstruction: 24

– Ventilation for central mirror: yes

– Mirror cell support points: 9

– Tube: GRP aluminum tube with adjustable tube rings and aluminum altitude bearings

– Tube diameter: 342mm

– Tube weight: 18.9kg

– Secondary mirror bracket: Thin 4-arm steel spider

– Tube rings and altitude wheels: Made from aluminum

– Focuser: 2.5″ HEXAFOC focuser with 2″ and 1 1/4″ adapter

– Mount: Dobsonian dismantlable rocker box

– Accessory tray:  Accommodates one 2″ and two 1 1/4″ eyepieces, mounted on the front side

– Eyepiece: 1 1/4″ 25mm Bresser Super Plössl

– Viewfinder: 6×30 viewfinder

– Viewfinder shoes: Two hybrid viewfinder shoes

– Tube weight without accessories: 16kg

– Tube weight with accessories: 18.9kg

– Rocker box weight: 14.8kg

– Total weight: 33.7kg

– Overall dimensions: 60 x 60 x 163cm

– Shipping dimensions Box 1: 134 x 45 x 45 cm (19kg)

– Shipping dimensions Box 2: 61 x 61 x 24 cm (17kg)

You can learn more about the Bresser Messier 12″ Dobson here.

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