Passer au contenu
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.
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.
Orion Optics UK 85mm Fixed Adaptor Ring (5mm BFD)

Orion Optics UK 85mm Fixed Adaptor Ring (5mm BFD)

par Orion Optics UK
UGC OOUK-85MM-FIXED-ADAPTOR-RING-5MM
$141.11 - $141.11
$141.11
$141.11 - $141.11
$141.11
Égalisation de prix!
  • 85mm Diameter Adaptor Ring
  • Provides 5mm of Back Focus Distance (BFD)
  • Fixed, Non-Adjustable Spacer Design
  • Ensures Rigid, Tilt-Free Connections
  • Manufactured by Orion Optics UK
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE aux USA pour les commandes de plus de 350$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Orion Optics UK 85mm Fixed Adaptor Ring (5mm BFD)

    The Orion Optics UK 85mm Fixed Adaptor Ring adds a precise 5mm of back focus distance to your imaging train, establishing the critical spacing required by field flatteners and coma correctors. With an inner diameter for 85mm-threaded components, this fixed-length ring provides a solid, non-flexing connection essential for long-exposure astrophotography.

    Fixed 5mm Spacer: The Key to Correct Back Focus

    Optical correctors, such as field flatteners or coma correctors, only work when the camera sensor is placed at an exact distance from their rear lens element. This 5mm fixed ring is a simple, robust solution for closing a small gap in your imaging train to hit that perfect distance. Unlike variable spacers, its fixed 5mm length is absolute, removing any chance of incorrect adjustment or slippage during an imaging run.

    85mm Threaded Connection for Maximum Rigidity

    For elite astrophotography, every component in the optical path must be rigidly secured to prevent tilt, which can elongate stars in the corners of your images. This Orion Optics UK 85mm adaptor provides a solid, threaded connection that maintains perfect alignment between your camera and telescope optics. Its precision-machined build ensures that your sensor remains perfectly perpendicular to the light path, preserving the sharpness your telescope is capable of delivering.

  • What is the purpose of the Orion Optics UK 85mm Fixed Adaptor Ring?

    This adaptor ring is a precision spacer designed to add exactly 5mm of back focus distance to an astrophotography imaging train. It's used to achieve the precise sensor-to-corrector distance required by field flatteners, reducers, or coma correctors for sharp, well-formed stars across the entire image.

    Why should I use the 5mm fixed adaptor instead of an adjustable spacer?

    A fixed spacer like the Orion Optics UK 5mm ring offers superior rigidity and reliability. Adjustable spacers can sometimes introduce tilt or slip under the weight of a heavy camera. A fixed ring provides a solid, non-moving connection, ensuring perfect optical alignment is maintained throughout your imaging session.

    How do I know if I need this 5mm BFD adaptor for my setup?

    Calculate the total back focus of your current imaging train. Start with the back focus requirement of your corrector (e.g., 55mm), then subtract the back focus provided by your camera, off-axis guider, and filter wheel. If the remaining gap is 5mm, this Orion Optics UK 85mm adaptor is the correct part to achieve perfect spacing.

    Will the Orion Optics UK 85mm adaptor introduce any tilt into my imaging train?

    No. The adaptor is precision-machined by Orion Optics UK to ensure its surfaces are perfectly parallel. When threaded correctly, it maintains the alignment of your optical components and is designed specifically to eliminate sources of tilt, not create them.

    Will this 85mm adaptor work with my full-frame camera and Orion Optics UK telescope to avoid vignetting?

    The large 85mm diameter of this adaptor is designed to provide a wide, clear light path, making it suitable for systems using large correctors and full-frame sensors. It helps ensure that the field illumination from the telescope's optics is not constricted, minimizing vignetting on larger camera sensors.

    I'm connecting my AGX Newtonian's coma corrector to a filter wheel. How does the 85mm fixed adaptor help?

    The coma corrector on an Orion Optics UK AGX Newtonian has a strict back focus requirement for optimal performance. This 85mm fixed adaptor ring can be used as part of the spacer combination between the corrector and your filter wheel to precisely make up the required distance, ensuring round stars to the edge of the field with your specific setup.

  • Adaptor Type Fixed Spacer Ring
    Diameter 85mm
    Back Focus Provided 5mm
    Manufacturer Orion Optics UK

    • 85mm Fixed Adaptor Ring (5mm BFD)

      × 1

  • Orion Optics UK 1-Year Warranty