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All-Star Telescope is your source for all things astro from telescopes to astrophotography cameras. Have a question? We'd love to help. Email: Call Us: (587) 336-6621 Toll Free: 1 (866) 310-8844
Have a question? We'd love to help. Email: Call Us: (587) 336-6621 Toll Free: 1 (866) 310-8844

Sharpstar 61Edph Reducer (61EDPHR45)

Original price $249.95 - Original price $249.95
Original price
$249.95 - $249.95
Current price $249.95

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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.

Another improvement is that the f/4.5 reducer is also designed with a 360-degree rotator, which is of great convenience for composition when imaging the deep-sky objects.


 Focal ratio f/4.5
Image circle 44mm
Lens 3 element air-spaced structure
Outer diameter 65mm
Back focs 55mm
Length 95mm (including the M48 thread)
Coating full-surface multi-layer coating
Weight 0.45kg