Sky-Watcher Skyliner-400P FlexTube Dobsonian Telescope
406MM (16") F/4.4 PARABOLIC TRUSS-TUBE DOBSONIAN
The Dobsonian mount, popularized by John Dobson in the late 1970’s and utilised in all Sky-Watcher Dobsonian telescopes, is a very simple but effective method of mounting a Newtonian Reflector, based on the alt-azimuth principle. Fast and easy to set up, the Sky-Watcher Dobsonian mount consists of a box-type mounting which allows the telescope to pivot in altitude, while the box itself is rotated on a base in azimuth. The secret of the design is to correctly balance the optical tube and to use frictional materials, which allow it to move easily when nudged but to stay in position when not. The mount is designed to be driven by hand as opposed to slow motion controls.
One of the potential downsides of a Dobsonian telescope is its physical size. To address this issue, especially when it comes to storage or transportation Sky-Watcher introduced their patented FlexTube system. The optical tube on a Sky-Watcher FlexTube Dobsonian telescope can be partially collapsed when not in use greatly reducing its length. This is a huge benefit for storage and transportation.
Magnifications (with Eyepieces supplied): x72 & x180
Highest Practical Power (Potential): x812
Diameter of Primary Mirror: 406mm
Telescope Focal Length: 1800mm (f/4.4)
Eyepieces Supplied (1.25"): SP10mm & 25mm
Dual-Speed 2" Crayford Focuser
Parabolic Primary Mirror
0.5mm Ultra-Thin Secondary Mirror Supports
Direct SLR Camera Connection
3-Point tube locking system, fully retractable
Tube dimensions: 540mm (diameter), 1071mm-1685mm (length)
Wooden Alt-Azimuth mount with accessory tray
34.5% more Light Gathering than 350mm
Lovely telescope, gives really great views of galaxies and other DSOs,cant wait to see Saturn and Jupiter through it.
You do need a two rung step ladder to use it when it is pointing higher than 45 o as its quite tall.
Also remember that you are needing a collimator as i.have found that you will need to recollimated every night of use,which is not a bad thing to do anyway.
Now the bad points and its about the instructions,they are only for up to a 12 inch dob.which is a problem as cradle is different also no instructions for mirror cell insulation,how ever the good news is that they can be easily found via Google one for cradle one for mirror.
One other good point is the mirror cradle is so much better than my 10 inch skywatcher dob
Ps i also replaced the secondary mirror cells adjustment screws with the ones you can adjust with your fingers,this make collimation much faster ."