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Refractor Cross Reference Table

Choose a Telescope:

Item Number 21052 21067 22062 21071 21076 21083 21086 22082 21013 21016 21017
Description Firstscope 60AZ Firstscope 60EQ NexStar 60GT Firstscope 70AZ Firstscope 70EQ Firstscope 80AZ Firstscope 80EQ NexStar 80GT C102-AZ C102 HD CR150 HD

Standard Equipment

Focal Length 700mm F/1 2 900mm F/15 700mm F/12 700mm F/10 900mm F/13 900mm F/11 900mm F/11 400mm F/5 500mm F/5 1000mm F/10 1200mm F/8
Finderscope Star Pointer Star Pointer Star Pointer Star Pointer Star Pointer Star Pointer Star Pointer Star Pointer 6x30 6x30 9x50
Mount Altazimuth Equatorial Motorized Altazimuth Altazimuth Equatorial Altazimuth Equatorial Motorized Altazimuth Altazimuth Heavy Duty Equatorial Heavy Duty Equatorial
Eyepiece 20mm Kellner (35x) 20mm Kellner (45x) 20mm MA (35x) 20mm Kellner (35x) 20mm Kellner (45x) 20mm Kellner (45x) 20mm Kellner (45x) 25mm SMA (16x) 20mm Plössl (25x) 20mm Plössl (50x) 20mm Plössl (60x)
Eyepiece 10mm Kellner (70x) 10mm Kellner (90x) 10mm MA (70x) 10mm Kellner (70x) 10mm Kellner (90x) 10mm Kellner (90x) 10mm Kellner (90x) 10mm SMA (40x) n/a n/a n/a
Star Diagonal 1.25" 1.25" 1.25" 1.25" 1.25" n/a 1.25" 1.25" n/a 1.25" 1.25"
Erect Image Eyepiece/Diagonal 1.5xE.I. Eyepiece n/a n/a 1.5xE.I. Eyepiece n/a 1.25"
45 degree
n/a n/a 1.25"
45 degree
n/a n/a
Accessory Tray yes yes yes yes yes yes yes yes yes yes yes
Tripod aluminum aluminum pre-assembled aluminum aluminum aluminum aluminum aluminum pre-assembled aluminum aluminum aluminum aluminum
CD ROM The Sky L1 The Sky L1 The Sky L1 & GuideStar The Sky L1 The Sky L1 The Sky L1 The Sky L1 The Sky L1 & GuideStar The Sky L1 The Sky L1 The Sky L1
Computer Hand Control n/a n/a Fully Computerized n/a n/a n/a n/a Fully Computerized n/a n/a n/a
Database n/a n/a 4,000 Object Database na/ n/a n/a n/a 4,000 Object Database n/a n/a n/a
Technical Specifications
Highest Useful Magnification 142x 142x 142x 165x 165x 189x 189x 189x 241x 241x 354x
Lowest Useful Magnification 9x 9x 9x 10x 10x 11x 11x 11x 15x 15x 21x
Limiting Stellar Magnitude 11.4 11.4 11.4 11.7 11.7 12 12 12 12.5 12.5 13.4
Resolution:Rayleigh 2.31 arc seconds 2.31 arc seconds 2.31 arc seconds 1.98 arc seconds 1.98 arc seconds 1.73 arc seconds 1.73 arc seconds 1.73 arc seconds 1.36 arc seconds 1.36 arc seconds 0.92 arc seconds
Dawes Limit 1.93 arc seconds 1.93 arc seconds 1.93 arc seconds 1.66 arc seconds 1.66 arc seconds 1.45 arc seconds 1.45 arc seconds 1.45 arc seconds 1.14 arc seconds 1.14 arc seconds 0.77 arc seconds
Photographic Resolution 156
line/mm
121
line/mm
156
lines/mm
182
lines/mm
141
lines/mm
162
lines/mm
162
lines/mm
364
lines/mm
371
lines/mm
185
lines/mm
227
lines/mm
Light Gathering Power 73x
unaided eye
73x
unaided eye
73x
unaided eye
100x
unaided eye
100x
unaided eye
131x
unaided eye
131x
unaided eye
131x
unaided eye
212x
unaided eye
212x
unaided eye
459x
unaided eye
Field of View: Standard Eyepiece 1.4° 1.1° 1.4° 1.5° 1.1° 1.2° 1.2° 3.25° 2.0° 1.0° 0.83°
Linear FOV (@1000 yds) 75 ft 58 ft 75 ft 78 ft 58 ft 61 ft 61 ft 171 ft 105 ft 52.5 ft 43.8 ft
Optical Coatings Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated Multi-Coated
Optical Tube Length 28 inches 28 inches 28 inches 28 inches 30 inches 36 inches 36 inches 15.5 inches 21 inches 40 inches 50.5 inches
Telescope Weight 7 lbs 11 lbs 9.5 lbs 12 lbs 17 lbs 18 lbs 18 lbs 11 lbs 17.5 lbs 36 lbs 45 lbs

Support

The Registry of Nature Habitats - Buy Conservation Credits


For purchasing Conservation Credit(s)
You will receive
a copy of the John Audubon Multimedia CD
A replica of the complete (1840-1844)
James Audubon's Birds of America

You will also receieve a bluebird house for each Conservation Credit purchased and a 20% off coupon to be used on the A Bird's Home website!




Conservation Certificates

The Registry of Nature Habitats - Mission Statement

The Registry of Nature Habitats is dedicated to the preservation of land that, over time, has been a site and home for complex ecosystems. The Registry advocates preservation of these lands and its inhabitants, environmental education for community individuals and groups, and nurturing of these lands through restoration in order to conserve its natural resources for future generations.

Preserve

The Registry of Nature Habitats manages critical habitat, consisting of wetland, lowland, upland, forest and stream habitat, providing a home to wildlife species and plant species. As part of the mission to preserve these lands and its inhabitants, the Registry will continue to contract with owners of ecologically sensitive land as it becomes available.

Educate

The Registry of Nature Habitats is a "teaching ground," able to provide hands-on, interpretive learning experiences in areas such as ecology, botany, wildlife science, and geology, as well as the arts and humanities. The educational mission of The Registry of Nature Habitats is to teach an understanding and appreciaton of the environment, the invaluable lesson of land stewardship of our natural resources, and to expand the general knowledge of this habitat through scientific research. This will be accomplished through a year-round experiential, interactive approach, along with onsite and outreach activities including providing educational material both on this website, on media and through educational seminars. An on-site facility is in the design phase, which will house classrooms and an administrative space.

Nurture

Through several restoration projects, including the rebuilding of stream corridors, reintroducing native flora, and permitting only low-impact activities, the Registry is nurturing much land back to its natural state, undoing the damage of hundreds of years. The Registry of Nature Habitats restoration plan, developed with public and private partnerships and with local community support, will increase the land's value, enhance wildlife habitat, improve water quality, and preserve the integrity of the land's bio-diversity.

Renewable Energy

Promote the use of renewable and efficient energy technologies through education, training, workforce development, research, and project facilitation. The Registry supports clean energy development and energy conservation as the means to protect the environment, enhance public health, and save our nature habitats.

Conservation

We seek to educate people and provide innovative solutions that will help build a clean, more efficient world, by reducing energy consumption in a prudent way that does not threaten the natural balance that supports all life.




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