61EDPH f/4.5 Full-Frame Reducer

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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Product introduction

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

61EDPH f/4.5 full-frame reducer Parameters

Application

61EDPH

Focal ratio

f/4.5

Image circle

44mm

Lens

three-element air-spaced structure

Outer diameter

65mm

Back focus

55mm

Length

95mm(including the M48 thread)

Coating

full-surface multi-layer coating

Weight

0.45kg

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