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
- 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
- 5×24 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
| Optical Design | Newtonian Reflector |
| Aperture | 76 mm / 3″ |
| Focal Length | 300 mm |
| Focal Ratio | f/4 |
| Focuser | Rack-and-Pinion |
| Eyepiece Barrel Diameter | 1.25″ |
| Diagonal | None |
| Finderscope | Yes |
| Optical Tube Dimensions | Length: 10″ / 25.4 cm |
| Type | Manual; Alt-Azimuth |
| Batteries | None |
| GPS | No |
| Wi-Fi | No |
| Weight | 4.3 lb / 2 kg |
| Package Weight | 5.15 lb |
| Box Dimensions (LxWxH) | 15.2 x 9.5 x 9.5″ |
