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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Explore Scientific Camera-Ring M48x0.75 for Nikon
Explore Scientific Camera-Ring M48x0.75 for Nikon
Explore Scientific Camera-Ring M48x0.75 for Nikon

Explore Scientific Camera-Ring M48x0.75 for Nikon

by Explore Scientific
SKU ES-510384
$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99
Price Match Policy!
  • Connects Nikon F-mount DSLR cameras to M48x0.75 threaded accessories
  • 41.2mm clear inner diameter minimizes vignetting on full-frame sensors
  • Adds a precise 8.0mm of optical path length to your imaging train
  • Constructed from matte black anodized aluminum for durability
  • Weighs only 30 grams to reduce load on your focuser
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  • Description
  • FAQ
  • Specifications
  • In the Box
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  • Explore Scientific Camera-Ring M48x0.75 for Nikon

    The Explore Scientific Camera-Ring for Nikon adapts your DSLR to the modern astrophotography standard with its M48x0.75 female thread and a wide 41.2mm inner diameter. This design eliminates the vignetting common with older M42 T-rings on full-frame sensors, while contributing a precise 8.0mm to your back focus distance in a lightweight 30-gram body.

    M48 Threading: A 41.2mm Aperture for Full-Frame Sensors

    This adapter ring is built around the M48x0.75 thread, the preferred standard for connecting full-frame cameras to field flatteners, reducers, and coma correctors. Its generous 41.2mm clear internal aperture allows the full light cone to pass unobstructed to your sensor, ensuring your images are brightly illuminated from corner to corner without the tell-tale dimming or clipping that plagues smaller adapters.

    Precision Spacing: An 8.0mm Light Path in a 30g Body

    Achieving the correct distance between your corrector and sensor is critical for sharp stars across the field. This adapter adds exactly 8.0mm of optical path length, a standard figure that simplifies back focus calculations. Machined from matte black anodized aluminum, the ring weighs only 30 grams, adding minimal mass and flexure to your imaging train.

    M48 vs. M42 T-Rings: Why the Larger Thread Matters for Imaging

    While the classic M42 T-ring was sufficient for APS-C and smaller sensors, it acts as a bottleneck for modern full-frame DSLRs. The physical opening of an M42 adapter is too small, causing it to cut off light at the edges of a 35mm sensor, resulting in vignetting.

    • M42 (T-Thread): Limited clear aperture often vignettes full-frame sensors, requiring aggressive flat-field correction and cropping.
    • M48 (2-inch Filter Thread): The larger diameter provides a completely unvignetted field for full-frame sensors, preserving image data and quality across the entire frame.

  • What is the benefit of the Explore Scientific M48 ring over a standard M42 T-ring for my Nikon?

    The primary benefit is the prevention of vignetting on full-frame cameras. The M48x0.75 thread and wide 41.2mm internal diameter provide a much larger light path than a standard M42 T-ring, ensuring the corners of your full-frame sensor are fully illuminated.

    Will this M48 ring work with my Nikon D850 or other full-frame DSLR?

    Yes. This adapter is designed with a standard Nikon F-mount bayonet and is specifically intended for full-frame Nikon DSLRs like the D810, D850, and D750 to leverage their large sensors without vignetting. It is also fully compatible with Nikon APS-C (DX-format) cameras.

    How does the 8.0mm light path of this ring affect my back focus calculation?

    You must include this 8.0mm in your total back focus distance. For example, if your field flattener requires 55mm of back focus, this adapter provides 8.0mm of that distance. You would then need an additional 47mm of extension tubes to achieve perfect spacing.

    Can I thread 2" filters into this Explore Scientific Nikon M48 ring?

    No, this adapter has female M48 threads designed to attach to a telescope's field flattener or corrector. To use filters, you would typically place them in a filter drawer or wheel, or thread them onto the nosepiece that goes into your focuser, ahead of this adapter in the optical path.

    Is the 41.2mm inner diameter of this adapter large enough for an f/4 imaging Newtonian?

    Yes, the 41.2mm clear aperture is designed to handle the steep light cones from fast optical systems. When paired with a proper M48-threaded coma corrector, this ring will prevent the adapter itself from being the cause of vignetting, even on fast telescopes.

    What material is the Explore Scientific M48 Camera-Ring made from?

    The adapter is made from lightweight and durable matte black anodized aluminum. The anodizing process increases surface hardness and corrosion resistance, while the matte black finish minimizes internal reflections that could reduce image contrast.

  • GTIN 4007922064185
    Compatible Camera Mount Nikon F-mount
    Adapter Thread M48x0.75 (Female)
    Inner Diameter 41.2 mm
    Optical Path Length 8.0 mm
    Material Matte Black Anodized Aluminum
    Weight 30 g

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