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Celestron M42 Spacer Ring Kit For Discount

Original price was: $124.99.Current price is: $62.50.
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Estimated Delivery:
15 - 22 Mar, 2025
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Description

To achieve the best astroimages, it is important to attain the proper back-focus distance for your camera relative to the telescope it is being used with. If the back-focus distance your camera consumes is not exact, the performance at the corners of full frame imaging sensors will suffer—stars will appear elongated and not as pinpoints.
Example: RASA 8 with a ZWO ASI 183 MC PRO camera

  • Required back-focus distance for RASA 8 with included M42 camera adapter: 25mm
  • Back-focus consumed by ZWO ASI 183 MC PRO camera: 17.5mm
  • To achieve equal back-focus distance, a 7.5mm M42 spacer ring is required
    •  
      Celestron’s M42 Spacer Ring kit includes three different length spacer rings to achieve the proper back-focus distance with our popular Celestron optical tubes and T-thread camera adapters.
       
      How to Use
      Depending your method of astrophotography (DSLR or CCD CMOS), there are two ways to use the M42 Spacer Ring. If you are using a DSLR, place the desired M42 Spacer Ring between your T-Ring and your T-Adapter for your optical tube. If you are using a CCD or CMOS camera, place the desired M42 Spacer Ring between the camera and the T-Adapter for your optical tube.

      Below is a quick guide to help you determine which spacer ring to use for our EdgeHD, Schmidt-Cassegrain, and RASA 8 optical tubes:

      Spacer Ring Size:

      Works best with:

      7.5mm

      Provides proper spacing with RASA 8 for many ZWO cameras

      12mm

      Provides proper spacing with RASA 8 for many Atik cameras

      30mm

      Converts ZWO camera w filter slider to 55mm back-focus standard for use with Schmidt-Cassegrain & EdgeHD

      Body
      The M42 Spacer Rings are machined aluminum black anodized. The internal surfaces are blackened and glare-threaded to provide the highest contrast. Each spacer ring has a knurled surface, providing a great gripping surface for threading unthreading. The M42 Spacer Rings are compatible with M42 x 0.75 (T-thread) camera adapters.

      GENERAL

      Thread:

      M42 x 0.75

      Spacer lengths:

      7.5mm (.29 ), 12mm (.47 ), and 30mm (1.18 )

      Construction:

      Aluminum black anodized

      Interior:

      Blackened and glare threaded

      Exterior:

      Knurled grip surface, each ring labeled with its length

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