Most reflectors today usually have a coat of aluminium as the mirror surface and then an overcoat of silicon monoxide or silicon dioxide to protect it. Silicon dioxide produces a much more durable coat than silicon monoxide but requires specialized equipment to apply it and is therefore more expensive. Protection is needed, because in most reflectors, the mirror is open to the elements and deterioration of the reflective layer reduces the resolution of the telescope. ALL Sky-Watcher reflectors are Multi-Coated with Silicon Dioxide as standard for Optimum Durability and Long Term Performance.

127MM (5") F/1500 MAKSUTOV-CASSEGRAIN TELESCOPE

• Highest Practical Power (Potential): x254

• Diameter of Primary Mirror: 127mm

• Telescope Focal Length: 1500mm (f/11.81)

• Eyepieces Supplied (1.25"): 10mm & 25mm

• Red Dot Finder

• 1.25"/31.7mm Star Diagonal

• Focusing by Moving Primary Mirror

• Built-in Polar Alignment Scope Holder

• 55% more Light gathering than 102mm

”The telescope is optically very good, giving clear, sharp images.“ Sir Patrick Moore 1923 to 2012 Endorsed and recommended by  Sir Patrick Moore CBE FRS .

Our View

With any Cassegrain telescope you will have to consider the affect dew fall. The cheapest solution is a lens hood but when dew is a real problem then heater straps will evaporate dew and frost off.

Review of Skymax-127 OTA
“…Optically, all the lenses are multicoated and the internal baffles had no shiny surfaces that could cause reflections of bright objects…The Focuser was quite smooth with very little image shift…The field was sharp across 80 percent of the view…We were pleased with the quality of the view even when pushing the telescope to higher magnifications…Mars and Saturn bore high magnifications well…The rings of Saturn appeared sharply defined…Turning to the Moon, it was a revelation through the Skymax…This telescope certainly does a good job on the more detailed Solar System objects…In the deep sky, the Skymax performed well on everything to galaxies to nebulae” 
Sky At Night Magazine