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 Weight5.15 lb
Box Dimensions (LxWxH)15.2 x 9.5 x 9.5"

Celestron Cometron Reviews

Definitely is a FUN Scope

By Dennis
Rated 3 out of 5
Date: 2022-01-14

Service from BH Photo was great! No problems! As received, the telescope had two problems. First, no eyepiece I have would slide into the focuser. It was way too tight! I unscrewed the end of the focuser tube and inspected where the eyepiece should have slipped through. It WAS too tight. So, I carefully sanded the plastic until the eyepiece just slipped through. I tested some other eyepieces as well and then reassembled the focuser tube. The second problem was the collimation. I found the collimation procedure in the paperwork did not give satisfactory results. So, I used a red laser collimator and fine-tuned to telescope collimation to the range where I needed the focus to be the sharpest for the SVBony 7mm to 21mm zoom eyepiece I planned to use. After the focuser was repaired and recollimated, the telescope image was very sharp from 7mm to 21mm. As a final adjustment, I removed the front lens from a Celestron Omni 2x barlow lens and screwed it onto the front of my SVBony 7-21mm zoom lens to get a 1.5X multiplier. So, at 21mm I have 21X magnification and at 7mm I have 64x magnification with sharp results on all settings of the zoom lens. Now, after making the repair to the focuser and with a better collimation adjustment, I have a very nice grab and go telescope that will give me a sharp image from 21x to 64x. Finally, I tossed the finderscope that came with the telescope and replaced it with a Celestron Red-Dot Finderscope #51630 Now I will give the telescope 5+ stars. It works great!!!

excellent beginner scope

By Jeff
Rated 4 out of 5
Date: 2015-11-17

small, light, easily set up.Excellent for young star gazers. not a toy.

Definitely a first scope, but a very well done first scope.

By Brent
Rated 5 out of 5
Date: 2018-11-01

I decided to get this scope instead of the Astromaster 130, because well, its cheap, and litterally my first scope!  After I get my bearings with this scope, I can give it to the grand kids and get something a little bit more...powerful.  This scope can barely look at a full moon without killing your eyes, but a moon filter does help (I got the Astromaster accessory kit.  Not super powerful at 300mm, but still does a great job.  I needed to adjust the secondary mirror a smidge to begin with, but even without that, it wasnt terrible.  The spotter scope is fairly temperamental to align, but I still love that it has it (never thought it would be so useful).  I live in appartment, so the base just barely fits on my deck railing.

good scope

By Alan
Rated 5 out of 5
Date: 2018-08-17

first light last night, moon Jupiter, Mars, satellite, all very good. this is not a toy! for 54.00 dollars worth every penny

See any errors on this page? Let us know

YOUR RECENTLY VIEWED ITEMS

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

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

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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