Celestron 91518 User Manual download pdf (Page 38)

AstroMaster & Omni

™

XLT Specifications

AstroMaster Item # 21061 21062 31035 21063 21064 31042 31043 31045

Model Name AstroMaster 70AZ AstroMaster 70EQ AstroMaster 76EQ AstroMaster 90AZ AstroMaster 90EQ AstroMaster 114EQ AstroMaster 114AZ AstroMaster 130EQ

Optical Design 70mm (2.8") refractor 70mm (2.8") refractor 76mm (3") reflector 90mm (3.5") refractor 90mm (3.5") refractor 114mm (4.5") reflector 114mm (4.5") reflector 130mm (5") reflector

Focal Length / Ratio 900mm / f/13 900mm / f/13 700mm / f/9 1000mm / f/11 1000mm / f/11 1000mm / f/9 1000mm / f/9 650mm / f/5

Finderscope Built-on StarPointer Built-on StarPointer Built-on StarPointer Built-on StarPointer Built-on StarPointer Built-on StarPointer Built-on StarPointer Built-on StarPointer

Tube Attachment Dovetail Bar Dovetail Bar Dovetail Bar Dovetail Bar Dovetail Bar Tube Rings w/dovetail Dovetail Bar Tube Rings w/dovetail

Mount Altazimuth CG-2 Equatorial CG-2 Equatorial Altazimuth CG-3 Equatorial CG-2 Equatorial Altazimuth CG-3 Equatorial

Eyepiece 20mm (45x) 20mm (45x) 20mm - Erect Image 20mm (50x) 20mm (50x) 20mm - Erect Image 20mm - Erect Image 20mm - Erect Image

Eyepiece 10mm (90x) 10mm (90x) 10mm (70x) 10mm (100x) 10mm (100x) 10mm (100x) 10mm (100x) 10mm (65x)

Star Diagonal Erect Image Eyepiece 1.25" diagonal 1.25" diagonal n/a 1.25" diagonal 1.25" diagonal n/a n/a n/a

Tripod 1.25" steel tube legs 1.25" steel tube legs 1.25" steel tube legs 1.25" steel tube legs 1.25" steel tube legs 1.25" steel tube legs 1.25" steel tube legs 1.25" steel tube legs

CD ROM The Sky L1 The Sky L1 The Sky L1 The Sky L1 The Sky L1 The Sky L1 The Sky L1 The Sky L1

Highest Useful Magnification 165x 165x 180x 213x 213x 269x 269x 306x

Limiting Stellar Magnitude 11.7 11.7 11.9 12.3 12.3 12.8 12.8 13.1

Resolution: Rayleigh 1.98 arc seconds 1.98 arc seconds 1.82 arc seconds 1.54 arc seconds 1.54 arc seconds 1.21 arc seconds 1.21 arc seconds 1.06 arc seconds

Dawes Limit 1.66 arc seconds 1.66 arc seconds 1.53 arc seconds 1.29 arc seconds 1.29 arc seconds 1.02 arc seconds 1.02 arc seconds .89 arc seconds

Light Gathering Power 100x unaided eye 100x unaided eye 118x unaided eye 165x unaided eye 165x unaided eye 265x unaided eye 265x unaided eye 345x unaided eye

Field of View: standard eyepiece 1.1º 1.1º 1.4º 1º 1º 1º 1º 1.5º

Linear FOV (@1000 yds) 58 ft 59 ft 75 ft. 53 ft. 53 ft. 53 ft. 53 ft. 79 ft.

Secondary Mirror Obstruction Dia, Area n/a n/a 25%, 6% n/a n/a 31%, 10% 31%, 10% 31%, 10%

Optical Coatings Fully-Coated Fully-Coated Aluminum Multi-Coated Multi-Coated Aluminum Aluminum Aluminum

Optical Tube Length 36 Inches 36 Inches 26 Inches 36 Inches 36 Inches 20 Inches 20 Inches 24 Inches

Telescope Weight 18 lbs 18 lbs 16 lbs 20 lbs 23 lbs 17 lbs 17 lbs 24 lbs

Omni XLT Item # 21088 21090 31057 11084

Model Name Omni XLT 102 Omni XLT 120 Omni XLT 150 Omni XLT 127

Optical Design Refractor Refractor Newtonian Reflector Schmidt-Cassegrain

Optical Features Non-Spherical Aberration Non-Spherical Aberration Non-Spherical Aberration Non-Spherical Aberration

Aperture 102mm (4") 120mm (4.7") 150mm (6") 127mm (5")

Focal Length 1000mm 1000mm 750mm 1250mm

Focal Ratio f/10 f/8.3 f/5 f/10

Optical Coatings StarBright XLT StarBright XLT StarBright XLT StarBright XLT

Optical Tube Color Dark Blue Metallic Dark Blue Metallic Dark Blue Metallic Dark Blue Metallic

Focuser 2" w/ 1-1/4" Adapter 2" w/ 1-1/4" Adapter 1-1/4" Standard SCT

Finderscope 6x30 6x30 6x30 6x30

Star Diagonal - 1-1/4" yes yes n/a yes

Eyepiece 25mm LET w/multi-coating 25mm LET w/multi-coating 25mm LET w/multi-coating 25mm LET w/multi-coating

CD-ROM The Sky L1 The Sky L1 The Sky L1 The Sky L1

Mount Type CG-4 German Equatorial CG-4 German Equatorial CG-4 German Equatorial CG-4 German Equatorial

Tripod w/bubble level 1.75" Stainless Steel Legs 1.75" Stainless Steel Legs 1.75" Stainless Steel Legs 1.75" Stainless Steel Legs

Counterweights 3.2kg & 1.8kg 3.2kg & 1.8kg 3.2kg & 1.8kg 3.2kg & 1.8kg

Highest Useful Magnification 241x 284x 300x 354x

Lowest Useful Magnification 15x 17x 18x 21x

Limiting Stellar Magnitude 12.5 12.9 13 13.4

Resolution: Rayleigh 1.36 arc seconds 1.15 arc seconds 1.09 arc seconds .92 arc seconds

Dawes Limit 1.14 arc seconds .97 arc seconds .91 arc seconds .77 arc seconds

Light Gathering Power 212x unaided eye 294x unaided eye 329x unaided eye 459x unaided eye

Field of View: standard eyepiece 1º 1.25º 1.0º 1.7º

Linear FOV (@1000 yds) 52.5 ft 66 ft 53 ft. 88 ft.

Secondary Mirror Obstruction n/a n/a 1.75" 1.75"

by Area n/a n/a 12% 8.5%

by Diameter n/a n/a 35% 29%

Optical tube length 40 inches n/a 21 inches 27 inches

Telescope Weight 36 lbs n/a 18 lbs 35 lbs

Specifications are subject to change without notice or obligation.

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Celestron 91518 User Manual Page 38

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