Celestron Cometron FirstScope 76mm f/4 Alt-Az Reflector Telescope

BH #CECFSTS • MFR #21023
Celestron Cometron FirstScope 76mm f/4 Alt-Az Reflector Telescope
Key Features
  • 76mm Aperture Newtonian Reflector
  • 300mm Focal Length, f/4 Focal Ratio
  • Aluminum / SiO2 Mirror Coatings
  • 1.25" Rack-and-Pinion Focuser
The Celestron Cometron FirstScope 76mm f/4 Alt-Az Reflector Telescope is designed as an ideal entry-level optic for observing the Moon and planets, comet-watching, and enjoying meteor showers. This tabletop telescope features a Newtonian reflector optical design whose mirror is coated with a highly reflective combination of aluminum with SiO2 to improve resolution and contrast, while reducing comas and color fringing. The scope comes with two fully multi-coated 1.25" diameter eyepieces that yield 15x and 30x magnifications. The manual tabletop alt-azimuth mount gives you easy control of the telescope for tracking near and deep-sky objects. This telescope is easy to assemble and transport, so you can spend less time setting up and more time enjoying the night sky.
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Celestron Cometron Overview

  • 1Description
  • 2Optical Performance
  • 3Accessories
  • 4Mount

The Celestron Cometron FirstScope 76mm f/4 Alt-Az Reflector Telescope is designed as an ideal entry-level optic for observing the Moon and planets, comet-watching, and enjoying meteor showers. This tabletop telescope features a Newtonian reflector optical design whose mirror is coated with a highly reflective combination of aluminum with SiO2 to improve resolution and contrast, while reducing comas and color fringing. The scope comes with two fully multi-coated 1.25" diameter eyepieces that yield 15x and 30x magnifications. The manual tabletop alt-azimuth mount gives you easy control of the telescope for tracking near and deep-sky objects. This telescope is easy to assemble and transport, so you can spend less time setting up and more time enjoying the night sky.

Optical Performance

  • 76mm aperture
  • f/4 focal ratio
  • 300mm focal length
  • Newtonian reflector design
  • Highly-reflective aluminum with SiO2 mirror coatings
  • Resolution: 1.83 arc sec, Rayleigh; 1.53 arc sec Dawes
  • Secondary Mirror Obstruction: 1.1 inches, 37% by diameter, 14% by area
  • 1.25" rack-and-pinion focuser

Accessories

    Eyepieces:
  • 1.25" diameter barrel
  • Accepts most 1.25" filters and accessories
  • Fully multi-coated to improve color and contrast
  • 10mm eyepiece for 30x magnification
  • 20mm eyepiece for 15x magnification
    Finderscope:
  • 5x24 configuration
  • Wide field of view enables fast acquisition of subjects and easy star-hopping

Mount

  • Manual alt-azimuth mount
  • Stable tabletop base
  • Weight: 4.3 lb
UPC: 050234210232

Celestron Cometron Specs

Optical Tube Assembly
Optical DesignNewtonian Reflector
Aperture76 mm / 3"
Focal Length300 mm
Focal Ratiof/4
FocuserRack-and-Pinion
Eyepiece Barrel Diameter1.25"
DiagonalNone
FinderscopeYes
Optical Tube DimensionsLength: 10" / 25.4 cm
Mount
TypeManual; Alt-Azimuth
General
BatteriesNone
GPSNo
Wi-FiNo
Weight4.3 lb / 2 kg
Packaging Info
Package Weight5.75 lb
Box Dimensions (LxWxH)15.2 x 9.5 x 9.5"
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YOUR RECENTLY VIEWED ITEMS

How does the quality of the eyepieces in the ...

How does the quality of the eyepieces in the accessory kit compare with the eyepieces that come with the scope?
Asked by: Eugene
The included eyepieces with the telescope should be Kellner type. The Celestron AstroMaster Accessory Kit (1.25") B&H # CEAAK MFR # 94307 also includes a 15mm Kellner level Eyepiece, but it also has a Upgraded 6mm Plossl Eyepiece, for higher magnification.
Answered by: david
Date published: 2021-01-11

Is the mirror spherical, or parabolic?

Is the mirror spherical, or parabolic?
Asked by: Alan
The Cometron Firstscope has a spherical primary mirror. Sincerely, Garrett at Celestron
Answered by: Telescope
Date published: 2019-07-16

Can it be used with a smartphone camera?

Can it be used with a smartphone camera?
Asked by: Stephen
Yes, you can position your smartphone camera lens on top of the eyepiece lens to take photos. Sincerely, Garrett at Celestron
Answered by: Telescope
Date published: 2019-07-12

question

Could this be attached to a photo tripod?
Asked by: Alan
No, the Cometron is a stand-alone tabletop telescope and cannot be attached to a tripod unless modifications are made. Sincerely, Garrett at Celestron
Answered by: Telescope
Date published: 2019-03-08

question

What is the largest usable magnification? I am guessing it is between 120X and 180X but I'd really like to know for sure!
Asked by: Anonymous
I can't answer this because I gave it to my grandson who is out of this country. However I would suggest that you 'google' Celestron. Their web site appears to offer good support. Another company that may be able to help you is Edmund Scientific. You would have to 'google' them also as they are an 'on line' company only.
Answered by: JOHN P.
Date published: 2018-08-28
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