Bressers design philosophy behind the Messier 10" Dobsonian Telescope puts the emphasis on quality core components and upgradability. The main mirror is made of H-PZ33 low expansion glass, in order to minimise cool down time. This primary mirror is ably mounted in a newly-designed cell with 9-point floating supports, which retains collimation well and is very simple to adjust. The secondary spider is thin enough to minimise defraction spikes, but substantial enough to support the secondard mirror assembly well. The telescope has a metal tube, which is strong and offers good stiffness in order to assist collimation retention. The Bresser Hexfocus 2.5" rack and pinion focuser offers class-leading support, due to its hexagonal cross section design, which results in no focusing flex, no matter what orientation the telescope is in the night time sky. This focuser has a heavy duty low profile rack and pinion focuser, which offers similar smoothness to Crayford-style focusers, without the potential for slippage that can occur with friction-based Crayfords at higher altitude under heavy load. Graduated measurements are inscribed on the exterior of the drawtube for precise focus measurement. A dual speed focus control for the Hexfocuser is also available as an additional, simple upgrade. The inclusion of a lockable focuser extension tube for visual use, once removed, enables the user to get to prime focus for astrophotography, a rarity in Dobsonian designs, meaning serious astrophotography is definitely an upgrade possibility.
A good quality 25mm Super Plossl eyepieces is supplied as standard, giving a magnification of 51x. Additional eyepieces of both 1.25" and 2" barrel sizes can be used with this telescope and are available as an added extra, (practical maximum eyepiece focal length is 30mm, minimum focal length up to around 4.5mm).
A 6x30mm finderscope is included, which allows for accurate pointing of the telescope, though this can be upgraded to Bresser's larger and more sophisticated 8x50mm illuminated finder.
The telescope is supported on two large side altitude wheels, which are attached to two adjustable tube rings. These adjustable tube rings allow the instrument to be rebalanced under different accessory loads and also facilitates a straightforward upgrade path to mounting the OTA on a fully computerised equatorial mount at a later date, via a standard Vixen/Synta or Losmandy profile dovetail plate.
The telescope mount is supplied flatpacked and can be disassembled and re-assembled easily for transportation storage
Newtonian optics with a parabolic primary mirror made from H-PZ33 low expansion glass material
Included in the package
2.5" HEX focuser with rack & pinion drive
Large altitude wheels provide smooth and precise movement, even at high magnifications
6x30 finder and SPL 25mm eyepiece included
9-point flotation system mirror cell for the for primary maximizes optical performance
Tube rings facilitate the use of the optics on equatorial mounts
The parts or the rocker-box are connected with metal furniture fasteners for easy assembly and dissasembly
Diffraction limited optics: Strehl 0.8
Net weight of Telescope = 11.5 kg
Net weight of Mount = 16.4 kg
Total shipping weight = 36 kg
Diameter Main Mirror: 254 mm
Focuser: 1270 mm
Main mirror made of low expansion glass
Shifiting-free focussing even with heavy acccessories
Tube can be shifted in the rings for easy balancing
Flatpackable rocker box (can be assembled and deassempled for storage)
Altitude bearings are connected to tube rings
Optics usable on other mounts
Adjustment and locking screws have different diameters
What's in the box
Newtonian optical tube assembly
25mm SuperPlössl eyepiece (31.7 mm / 1.25")
1 Tube extender 37.5mm for 2.5" Hexafoc
1 Eyepiece holder reducer ring, 2" to 1.25" (50.8 mm to 31.7mm)
2 Side supporting altitude wheels
Rockerbox with two baseplates and side supports (flatpacked for self-assembly)
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