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Celestron 0.7x Reducer Lens for EdgeHD 800 Telescope

BH #CERL8EHD • MFR #94242
8 reviews
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Celestron 0.7x Reducer Lens for EdgeHD 800 Telescope
Key Features
  • For 8" EdgeHD Optical Tube
  • 0.7x Focal Reduction, 43% Wider FOV
  • Fully Multicoated Lanthanum Glass
  • 105mm Back Focus Distance
The 0.7x Reducer Lens for EdgeHD 800 from Celestron adds one full f-stop of exposure speed and broadens the field of view of the 8" configuration of Celestron's EdgeHD optical tube. This telescope accessory has a fully multicoated optical path featuring high-transmission lanthanum glass elements with blackened edges, delivering color faithful images that are contrast-rich and crisp from center to edge. A 105mm back focus distance accommodates additional imaging accessories and a wide range of cameras, including the Nightscape CCD and DSLRs. The 0.7x Reducer Lens has an aluminum housing that is precisely machined to ensure exact spacing and alignment of the optical elements.
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Celestron 94242 Overview

The 0.7x Reducer Lens for EdgeHD 800 from Celestron adds one full f-stop of exposure speed and broadens the field of view of the 8" configuration of Celestron's EdgeHD optical tube. This telescope accessory has a fully multicoated optical path featuring high-transmission lanthanum glass elements with blackened edges, delivering color faithful images that are contrast-rich and crisp from center to edge. A 105mm back focus distance accommodates additional imaging accessories and a wide range of cameras, including the Nightscape CCD and DSLRs. The 0.7x Reducer Lens has an aluminum housing that is precisely machined to ensure exact spacing and alignment of the optical elements.

Optical Performance
  • 0.7x magnification reduction
  • Increases field of view by 43%
  • Adds one f-stop speed to EdgeHD 800 optics
  • Fully multicoated optics, extra low dispersion lanthanum glass
  • 105mm back focus distance accommodates imaging accessories
  • Blackened lens edges for reduced internal reflection
Use and Handling
  • Compatible with EdgeHD 800 T-adapter
  • Works with DSLRs and Nightscape CCD Cameras
  • Optimized for APS-C camera sensors
  • Threaded metal lens covers
Construction Details
  • Machined aluminum housing
  • 12.7 oz (360g) weight
UPC: 050234942423

Celestron 94242 Specs

Magnification
0.7x
Lens System
4 elements
Back Focus Distance
4.1" (105 mm)
Weight
12.7 oz (360 g)
Packaging Info
Package Weight
1.18 lb
Box Dimensions (LxWxH)
4.45 x 4.45 x 3.45"

Celestron 94242 Reviews

Good piece of kit

By Richard
Rated 5 out of 5
Date: 2025-12-29

I have only used this twice but I have nothing negative to say about. It does give you an extra full f/stop of light, so that's a good thing. My images from it look fairly sharp and I haven't even collimated the EdgeHD 8" scope I bought at the same time. With BlurXterminator any sharpness issues are easily taken care of. I would recommend it.

When no one else had inventory

By Stephen
Rated 4 out of 5
Date: 2022-08-22

This is the only Focal Reducer for the Edge HD 800 do not use any others. Fits perfectly and was made specific for that OTA

See any errors on this page?

question

Is it possible to use this together with celestron off-axis guider in DSLR astrophotography? I saw in some forums that this reducer doesn't have enough back focus to allow it.
Asked by: Mahesh K.
Yes, there are options that will work. However, the Celestron OAG is too thick, you'll need a super thin one and special adapters to obtain the proper back focus.
Answered by: Wade
Date published: 2021-08-24

Can this be used for visual observing as well as ...

Can this be used for visual observing as well as photography?
Asked by: George
Yes, the .7x Reducer Lens for EdgeHD 800 Telescope can be used for visual observing as well.
Answered by: Telescope
Date published: 2022-09-10

question

Can I get the full view of tue moon or sun on to cropped frame DSLR such as Canon EOS 70D by using this focal reducer with EdgeHD 8?
Asked by: Mahesh K.
Probably not. Your focal length will be ~1500mm with the reducer. As a side, I have no idea why someone would use it for planetary imaging as you want more magnification, not less for that. Planets are very small and bright. The f10 is not a problem but the small size in your field of view is. Planetary imaging is best performed using a video camera with a very small chip made for the task and stacking the good frames. This is to reduce the effects of the atmospheric seeing at high magnifications. Eyepiece projection is also used when the seeing is good.
Answered by: Wade
Date published: 2021-08-23
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