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URL: http://www.thaiexcite.com/iOptron-8711-OTA-90mm-Refractor-Astronomical-Telescope-R90-.html
*ลดล้างสต๊อก* กล้องดูดาว iOptron 8711 OTA 90mm Refractor Astronomical Telescope (R90)
รายละเอียด
รายละเอียด
- 90mm Refractor/ f5.6
- Focal length 500mm
- Two Optical Eyepieces (10mm and 25mm)
- 45 deg. Erect Prism Diagonal
- Dust cap
- Vixen dovetail plate
- One year limited warranty
The iOptron 90mm OTA (R90) is a great astronomy telescope that is a powerful yet portable enough to take anywhere. With fully multi-coated achromatic optics, the R90 reveals brighter and sharper images. The wide field of view of a 90mm objective lens and short 500mm (f/5.6) focal length are perfect for night sky observation, making it ideal for Moon, planets and larger deep-sky objects.
Comes with 2 optical eyepieces (10mm and 25mm) and a 45 deg. erect prism diagonal, the R90 is also a good portable scope for bird watching and terrestrial observation. The equipped dovetail makes it fit to any telescope mount that accepts Vixen-style dovetail. The R90 is an excellent mate for iOptron's Cube or CubePro GOTO telescope mount.
Specifications:
| Mount Type | Vixen-style dovetail |
| Optical Design | Air Spaced Doublet Refractor |
| Aperture | 90mm / 3.54" |
| Ratio | f/5.6 |
| Resolution Power | 1.29 arc sec |
| Limited Magnitude | 11.5 |
| Highest Useful Magnification | 180X |
| Focuser | 1.25" rack-and-pinion |
| Eyepiece Adapter | 1.25" / 31.75mm |
| Eye Pieces | 25mm / 0.98"(20X) and 10mm / 0.39" (50X) |
| Diagonal | 45 deg. Erect Prism Diagonal |
| Length | Focal Length: 500mm / 19.69" |
| Optical Tube Length | 19.0" / 482.60mm, without diagonal and eyepiece |
| Weight | 4.0lbs / 1.81kg, with diagonal and eyepiece |