- Telescope System: Optical Tube Only (OTA)
- Telescope type: Apochromatic Refractor, Refractor
- Telescope brand: Sharpstar
- Telescope Aperture (Range): 61mm
- Telescope Focal Ratio (F): F5.5
Sharpstar 61EDPHII apochromatic telescope with optional F4.5 reducer
Technology is developing so fast, there is a big boost in people's demand for goods. In recent years, some new changes have taken place in the field of astronomy products. With the popularization of digital cameras and people's increasing love of astronomy photography, an all-round equipment that features photography and suitable for observation is needed to meet customers' demand. SharpStar 61EPHII occurs under this background. This telescope features a two-element fully separated lens design with a focal length of 335mm and a focal ratio of f/5.5.
The use of one extra-low dispersion glass elements makes the overall tube shorter and more portable. The dedicated unitary tube rings with hollow design and streamlined handles is fashionable and beautiful and you can add some accessories to connect. The 61EDPHII package also contains a 10cm dovetail plate, it have a screw-hole in the center that allows the camera to be mounted to a tripod for photography. The back-end is equipped with a middle 2.5" rack and pinion precision focuser to be used with a large dedicated reducer.
The following discussion will focus on the dedicated full-frame reducer of 61EDPHII, because it meets the need of full-frame photography. The reducer is equipped with a 2.3" tube, one end of which adopts a M63×1 thread and connects to the pinion focuser of the primary mirror. The other end adopts a M48×0.75 thread, the focal plane is 55mm from the end interface. If you need to expand, it can measure up to 99mm by removing the end interface and adapting your own accessories, which fully meets the requirements of a wide range of photographic accessories. The reducer features a three-element fully detached structure, which helps to support full-frame photography and achieve excellent perimeter dimmer control. The reducer is specifically designed for deep-space widefield astro photography with a focal length of 275mm and a focal ratio of f/4.5.
In addition, the 360-degree rotator allows you to easily rotate the camera to achieve the best image framing.
- Aperture size：64mm
- Limiting visual magnitude：10.7
- Focal ratio：f/5.5
- Resolution：1.93 arc second
- Tube length：235mm（when contracted）
- Accessories：one tube ring, one dovetail plate, one handle
- Tube outer diameter：80mm
- Net weight：1.5kg（without tube ring and dovetail plate）
- Gross weight：1.9kg（with tube ring and dovetail plate）
- Objective lens：Triplet air-spaced APO（including an ED glass）
- Telescope System
- Optical Tube Only (OTA)
- Telescope type
- Telescope Aperture (mm)
- Telescope Focal Ratio (F)