iOptron 80mm Refractor
- 80mm Achromatic Refractor Optics
- 400mm Focal Length (f/5)
- Lightweight 2.2 lbs Optical Tube
- Includes 25mm and 9mm 1.25" Eyepieces
- 45º Erect Image Diagonal for Day and Night Viewing
The 80mm Refractor combines an 80 mm aperture with a short 400 mm focal length for a fast f/5 optical system designed for wide-field stargazing and easy portability. This compact optical tube assembly delivers a resolving power of 1.4 arc seconds and weighs only 2.2 lbs, making it an excellent grab-and-go instrument for sweeping the Milky Way or for daytime terrestrial viewing.
With its 80 mm aperture and fast f/5 focal ratio, this refractor excels at low-power, wide-field observation. Using the included 25mm eyepiece, you can frame large open star clusters like the Pleiades (M45) or scan the rich star fields of Cygnus. Its compact size and 2.2 lbs weight make it easy to mount on any light-duty photo tripod or astronomical mount for quick sessions.
As an achromatic refractor, especially at a fast f/5 ratio, this design prioritizes brightness and field of view over perfect color correction. On very bright objects like the Moon, Jupiter, or brilliant stars like Vega, you will notice some chromatic aberration, or "false color," which is a characteristic trade-off for this portable and affordable optical design.
This refractor includes a 45º erect image diagonal, a key component that makes it suitable for both astronomical and terrestrial viewing. Unlike standard 90º star diagonals that show a mirror-reversed image, the 45º diagonal provides an image that is correctly oriented both up-down and left-right. This makes it intuitive to use for birdwatching, landscape viewing, or tracking boats on the water.
The package comes with two 1.25" eyepieces to get you started: a 25mm for low-power, wide-field scanning and a 9mm for higher magnification views of the Moon's craters or Jupiter's moons. The simple and reliable 1.25” rack-and-pinion focuser allows for easy and smooth focusing for any target, day or night.
With the included 25mm eyepiece, the 80mm Refractor provides a wide field of view that can frame the entirety of the Andromeda Galaxy's bright core and a significant portion of its surrounding dust lanes from a dark sky site. Its fast f/5 optics make it well-suited for observing large, diffuse objects like M31.
Yes, using the included 9mm eyepiece, you will be able to see Saturn's rings as distinct from the planet itself. While an 80mm telescope won't resolve fine detail like the Cassini Division, the iconic shape of the ringed planet will be clearly visible.
The 45º erect image diagonal corrects the image to be both upright and non-reversed (left-to-right correct). This is essential for daytime terrestrial viewing, such as birdwatching or observing scenery, where a reversed image would be disorienting. It also provides a more comfortable viewing angle than looking straight through the telescope.
Yes, as an achromatic refractor with a fast f/5 focal ratio, some chromatic aberration is expected. You will likely notice a slight purple or yellow halo around very bright objects like the Moon, Venus, Jupiter, and the brightest stars. This is a normal optical characteristic for this type of telescope design.
Weighing only 2.2 lbs, this optical tube assembly (OTA) is very lightweight and versatile. It can be used on a sturdy photographic tripod with a fluid head for simple terrestrial and wide-field sky viewing. For more serious astronomical use, a light-duty alt-azimuth mount like an iOptron Cube or Sky-Watcher AZ-GTi would be an excellent choice.
Absolutely. Its light weight, simple rack-and-pinion focuser, and included accessories make it very easy to set up and use. The ability to use it for both daytime land viewing and nighttime stargazing provides a great introduction to telescopes without the complexity of larger, more specialized instruments.
| Optical Design | Achromatic Refractor |
| Clear Aperture | 80 mm |
| Focal Length | 400 mm |
| Focal Ratio | f/5 |
| Resolving Power | 1.4 arc sec |
| Focuser | 1.25” rack-and-pinion |
| Eyepiece Adapter | 1.25 inch |
| Included Eyepiece 1 | 25mm |
| Included Eyepiece 2 | 9mm |
| Included Diagonal | 45º erect |
| OTA Weight | 2.2 lbs |
| Shipping Weight | 4 lbs |
| Shipping Dimensions | 18 x 7 x 7 in |
80mm f/5 Refractor OTA
× 1
25mm Eyepiece
× 1
9mm Eyepiece
× 1
45º Erect Image Diagonal
× 1
Lens Cap
× 1
For warranty information, please refer to the documentation provided by the manufacturer.