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Canon 4409B002 1.4x EF Extender III WhiteType: Converters & AdaptersCamera Mount: Canon EFCompatibility: This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L.Magnification: 1.4xModel #: 4409B002
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CELESTRON NexStar 4SE Computerized 11049 TelescopeType: TelescopesSpecifications: Optical Design: Maksutov-Cassegrain
Aperture (mm): 102 mm (4.02")
Focal Length: 1325 mm (52")
Focal Ratio: 13
Focal Length of Eyepiece 1 (mm): 25 mm (0.98")
Magnification of Eyepiece 1: 53 x
Finderscope: StarPointer
Star Diagonal:"ternal Flip mirror for straight thru or 90 viewing angle
Mount Type: Single Fork Arm Altazimuth
Tripod: Steel with built-in wedge
Power Requirements: 8-AA batteries (not"cluded)
Highest Useful Magnification: 241 x
Lowest Useful Magnification: 15 x
Limiting Stellar Magnitude: 12.5
Resolution (Rayleigh): 1.37 arc seconds
Resolution (Dawes): 1.14 arc seconds
Light Gathering Power (Compared to human eye): 212 x
Apparent Field of View: 1 degree
Secondary Mirror Obstruction: 1.38" (35 mm)
Secondary Mirror Obstruction by Area: 12 %
Secondary Mirror Obstruction by Diameter: 34 %
Optical Coa...Model #: 11049