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M42 Spacer Ring Kit

Prices as of September 25, 2026, as listed by each retailer — verify the current price on the retailer's site before purchase.

Price history tracked at Macy's price tracker

14-day low
$48.64
Sep 12 · Macy's
Best price
$48.64
−0% vs high
14-day high
$48.64
All stores
$49$49$49
Sep 12Sep 25
  • Macy's
Lowest in 14 days: $48.64 at Macy's. Highest: $48.64. Current best is 0% below the 14-day high.

About this product

The Celestron M42 Spacer Ring Kit is a precision optical accessory designed to optimize back-focus distance between cameras and telescopes for astrophotography. It includes three machined aluminum spacer rings in 7.5mm, 12mm, and 30mm lengths, each black anodized with glare-threaded internal surfaces to minimize light scatter. The rings feature knurled exteriors for secure handling and are compatible with M42 x 0.75 T-thread adapters. They enable accurate alignment when using DSLR or CMOS/CCD cameras with Celestron's RASA 8, EdgeHD, and Schmidt-Cassegrain optical tubes, preventing image degradation such as elongated stars. Proper spacing ensures sharp, pinpoint star images across full-frame sensors.

  • 3 spacer rings: 7.5mm, 12mm, 30mm
  • machined aluminum construction
  • black anodized finish
  • knurled surface for grip
  • M42 x 0.75 T-thread compatible
  • reduces star elongation in imaging

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M42 Spacer Ring Kit — Price Tracker & History