• Explore Scientific M48×0.75 Extension Ring Set — 5-Piece (5–30mm) for Precise Focus and Camera Spacing
  • Explore Scientific M48×0.75 Extension Ring Set — view 2
  • Explore Scientific M48×0.75 Extension Ring Set — view 3
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Explore Scientific

Explore Scientific M48×0.75 Extension Ring Set — 5-Piece (5–30mm) for Precise Focus and Camera Spacing

Explore Scientific M48×0.75 Extension Ring Set — 5-Piece (5–30mm) for Precise Focus and Camera Spacing

$69.99
$69.99
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The Explore Scientific M48 x 0.75 extension ring set is a 5-piece kit (5mm to 30mm) that lets astrophotographers fine-tune the spacing in their imaging train. Correct back-focus — the exact distance between a field flattener or reducer and the camera sensor — is essential for pinpoint stars across the frame, and this set of stackable M48 spacers makes hitting that distance simple.

M48 (48mm) threads offer a wide clear aperture that avoids vignetting on larger sensors, and mixing the five ring lengths lets you dial in the precise spacing your optics require.

Who it's for

For astrophotographers using M48-threaded flatteners, reducers, and cameras who need to set exact back-focus spacing. New to imaging gear? See our astronomy 101 stargazing basics guide.

Key features

  • 5-piece spacer set (5–30mm) for flexible, stackable spacing.
  • M48 x 0.75 threads for a wide, vignette-free clear aperture.
  • Precise back-focus control to achieve pinpoint stars across the frame.
  • Mix-and-match lengths to reach almost any required distance.
  • Solid metal construction for a rigid, repeatable imaging train.
Specifications
Brand Explore Scientific
Model 510381
Type M48 extension ring set (5-piece)
Ring lengths 5mm to 30mm
Thread M48 x 0.75

Frequently asked questions

What are these rings for?
They set the precise spacing (back-focus) between a flattener or reducer and your camera sensor, which is critical for sharp, round stars across the image.

What lengths are included?
Five rings ranging from 5mm to 30mm, which you stack to reach the exact distance your optics need.

Why M48 instead of T2?
M48's larger thread provides a wider clear aperture, helping avoid vignetting with full-frame and larger sensors.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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