Celestron 0.7x Focal Reducer Lens for EdgeHD 925 OTAs

Product #90548 | SKU 94245 | Celestron
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  • Reduces OTA Focal Ratio to f/7
  • Drastically Reduces Exposure Time
  • Fully Multi-Coated Lanthanum Glass
  • Maintains EdgeHD Flat-Field Performance
  • Increases Field of View


The Celestron 0.7x Focal Reducer Lens for EdgeHD 925 OTAs makes the 9.25-inch Edge HD OTA even more versatile than ever, this reducer dramatically increases your field-of-view while also increasing the brightness of your image whether you’re using it for visual use or astrophotography.

Astrophotography Elements

All 0.7x EdgeHD Focal Reducers cut the exposure time in half from the f/10 configuration, capturing twice as much data in the same amount of time! Your focal reducer will shorten the focal length of the 9.25-inch EdgeHD from 2350mm to 1645mm, which will also speed up the focal ratio from f/10 to f/7. The corrected image circle for this focal reducer is 42mm, which is large enough to illuminate a full-frame camera sensor. You will not need to change adapters or sensor spacing as this reducer maintains the same 146 mm backfocus as the 9.25-inch EdgeHD without the reducer. It also uses the same 3.3 to 16/tpi threading found on the rear of the OTA.

Visual Elements

Since this 0.7x EdgeHD Focal Reducer doesn’t change the backfocus of the telescope and has the same thread type as the rear cell of the OTA, you can attach the 2-inch mirror (diagonal) that comes with your Edge OTA. All the eyepieces that you own will work just the same, only now you will have a wider field of view and the image in eyepieces will be substantially brighter.

Key Features:

  • 4-element optical layout designed specifically for the EdgeHD 9.25-inch.
  • Maintains the same back focus as when used at f/10.
  • One full F-Stop faster than f/10.
  • Increases the field of view by 43%.
  • Lanthanum Glass Elements.
  • Fully multi-coated lens elements.
  • Blackened edges.
  • Threads directly onto the 3.25-inch threads of the EdgeHD optical tube.
  • Clear aperture.
  • Machined aluminIum housing.
  • Threaded metal covers for both ends of the lens assembly.
  • Fastar compatibility and f/2 imaging with optional accessory.


Back Focus 146mm
Camera/Eyepiece Connection 3.3"/16 TPI
Glass Type "Rare Earth" Lanthanum

In The Box

  • Celestron 0.7x Focal Reducer Lens for EdgeHD 925 OTAs


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  • Product: Celestron 0.7x Focal Reducer Lens for EdgeHD 925 OTAs
  • Manufacturer: Celestron
  • Model: 94245
  • SKU: 94245
  • RM Product #: 90548

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