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The Astro Fi 90mm Refractor is a fully featured telescope that can be controlled with your smart phone or tablet using the free Celestron SkyPortal app. Celestrons SkyPortal app replaces the traditional telescope hand control for a 100% wireless experience. Just hold your smart device up to the night sky. When you find an object youd like to view, tap the screen. Your Astro Fi telescope automatically slews to the object, while the screen displays information about it. The Astro Fi 90 creates its own wireless connection, so it can communicate with your device even in remote locations where WiFi or cellular networks arent available. Getting ready to observe is quick and painless thanks to Celestrons award winning SkyAlign technology. Center any three bright objects in the eyepiece, and your telescope calculates its position. You can even generate a Sky Tour of all the best celestial objects to view based on your exact time and location.SpecificationsOptical Deisgn RefractorAperture90 mm Focal Length910 mm Focal Ratio10.1Focal Length of Eyepiece 1 mm 25 mm Magnification of Eyepiece 1 36xFocal Length of Eyepiece 2 mm 10 mm Magnification of Eyepiece 291xFinderscopeStarPointerStar Diagonal 1.25Mount Type Single Fork Arm AltazimuthAccessory TrayIncludes rubberized smartphone or tablet holderTripodAluminumHighest Useful Magnification213xLowest Useful Magnification13xLimiting Stellar Magnitude12.3Resolution Rayleigh1.54 arc seconds arc secondsResolution Dawes1.29 arc seconds arc secondsLight Gathering Power Compared to human eye165xOptical Coatings Fully CoatedOptical Tube Length 37.2 in94.5 cm in 945 mmTotal Telescope Kit Weight14.2 lbs 6.44 kgSlew SpeedsUp to 3 degsecondTracking RatesSidereal, Solar, and LunarAlignment ProceduresSkyAlign, 3 Star Align, Solar System AlignCommunication Ports Aux port for optional hand controlDatabase Over 120,000 objects including 220 of the best deep sky and solar system objects
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