100mm maksutov cassegrain telescope - Multi-Coated Green Telescope Lenses, fine aluminumcoatedmirror.Aperture: 4-inch/102mm,Focal length (f):1400mm (55-inch), f/14,Telescope lenses: Multi-Coated Green Telescope Lenses,Telescopes mirrors: fine aluminum coated mirror,Telescope mount: Heavy duty eq5 German equatorial mount,Finder scope: 8x50mm, Telescope tripod: heavy duty steel tube tripod, Telescopes eyepieces: 31.75mm (1.25") eyepiece pl6.5mm, pl20mm,50.8mm 90 deg. telescope diagonal mirror.Angular resolution (resolving power): 0.763 arcsec,Maximum useful magnification: 295x, Limiting magnitude: 14.8. Optional telescopes accessories: computerized telescopes:Auto GOTO tracking star system for EQ5,GPS telescopes:GPS external module,astrophotography telescope:Electro-focuser compatible with Auto GOTO tracking starsystem ,motorized reflector telescope:Dual axes hand control motor driver box for EQ5,2x or 3x achromatic barlow lens,2x ED barlow lens,70 degree Super Wide Angle/SWA eyepieces,80 degree Ultra Wide Angle/UWA eyepieces,Extra Dispersal/ED Eyepieces,zoom eyepieces,45 degree or 90 degree 100% full reflex roof prism,8x50 illuminating reticle finder scope,6mm or 12mm Illuminating reticle guide scope,Moon filter/luner filter,moon telescopes,Sun filter/solar filter,solar telescopes,sun telescopes,more eyepiece adapter and camera adapter for your option.Other Maksutov Cassegrain Telescope:6-inch, D=152mm,f=1900mm. producing area:China