76EDPH f/4.5 Full-Frame Reducer
Category： Correctors/Reducers/Flatteners
The 2.5" 76EDPH f/4.5 full-frame reducer is dedicated for Sharpstar 76EDPH astrograph. At one end of the reducer, there is M74×1 thread, tapped for the connection to the 76EDPH’s reducer and at the other end the reducer, there is M48×0.75 thread for the connection of most stock cameras.
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The 2.5" 76EDPH f/4.5 full-frame reducer is dedicated for Sharpstar 76EDPH astrograph. At one end of the reducer, there is M74×1 thread, tapped for the connection to the 76EDPH’s reducer and at the other end the reducer, there is M48×0.75 thread for the connection of most stock cameras.
The back focus is 55mm after the attachment of a camera. The reducer is designed with a three-element air-spaced lens structure, supporting full-frame imaging, effectively controlling unwanted vignette. The practical focal ratio of the Sharpstar 76EDPH when used with this reducer is f/4.5, and the focal length can be shortened to 342mm. It’s preferred by many deep-sky astrophotographers.
Another improvement is that the f/4.4 reducer is also designed with a 360-degree rotator, which is of great convenience for composition when imaging the deep-sky objects. The above-mentioned M48 thread is suitable for the connection for standard 2" filters.
Specifications
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76EDPH f/4.5 full-frame reducer Parameters |
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Application |
76EDPH |
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Focal ratio |
f/4.5 |
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Image circle |
44mm |
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Lens |
three-element air-spaced structure |
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Outer diameter |
88mm |
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Back focus |
55mm |
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Length |
77mm(including the M48 thread) |
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Coating |
full-surface multi-layer coating |
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Weight |
0.5kg |
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