61EDPH f/4.5 Full-Frame Reducer
Category： Sharpstar
The 2.3" 61EDPH f/4.5 full-frame reducer is dedicated for Sharpstar 61EDPH and 61EDPH II astrographs. At one end of the reducer, there is M63×1 thread, tapped for the connection to the 61EDPH’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 2.3" 61EDPH f/4.5 full-frame reducer is dedicated for Sharpstar 61EDPH and 61EDPH II astrographs. At one end of the reducer, there is M63×1 thread, tapped for the connection to the 61EDPH’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 maximum back focus can be extended up to 99mm if users add extra spacers(not included). 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 61EDPH when used with this reducer is f/4.5, and the focal length can be shortened to 275mm. It’s preferred by many deep-sky astrophotographers.
Specifications
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61EDPH f/4.5 full-frame reducer Parameters |
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Application |
61EDPH |
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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 |
65mm |
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Back focus |
55mm |
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Length |
95mm(including the M48 thread) |
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Coating |
full-surface multi-layer coating |
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Weight |
0.45kg |
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