Skip to content
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.
SVBONY SV193 0.8X Focal Reducer / Field Flattener - 2"
SVBONY SV193 0.8X Focal Reducer / Field Flattener - 2"
SVBONY SV193 0.8X Focal Reducer / Field Flattener - 2"
SVBONY SV193 0.8X Focal Reducer / Field Flattener - 2"

SVBONY SV193 0.8X Focal Reducer / Field Flattener - 2"

by SVBONY
SKU SV-W9152D
$83.59 - $83.59
$83.59
$83.59 - $83.59
$83.59
Price Match Policy!
  • 0.8x Focal Reduction Factor
  • Specifically designed for the SVBONY SV503 102ED Telescope
  • Corrects for field curvature for flat, sharp stars
  • 3-Element, 2-Group Optical Design
  • Standard 2-inch barrel and M48x0.75 camera threads
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV193 2" 0.8X Reducer Field Flattener for SV503 102ED Scope

    The SVBONY SV193 2" 0.8X Reducer Field Flattener is engineered to convert the SV503 102ED refractor into a faster, wider-field imaging instrument. Its 3-element optical system simultaneously shortens exposure times and corrects for the field curvature inherent in refractor optics, producing sharp stars across the entire frame. The unit connects to your camera via standard M48*0.75 threads and, at a mere 177g, adds minimal weight to your 2-inch imaging train.

    A Faster, Wider Field at 0.8x for the SV503 102ED

    By reducing the telescope's native focal length by a factor of 0.8x, the SV193 significantly expands your field of view. This allows you to frame larger deep-sky targets, such as the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000), that might otherwise be too large for your camera's sensor. This focal reduction also creates a faster optical system, allowing you to capture the same amount of signal in less time and reduce demands on your mount's tracking accuracy.

    3-Element Design for Edge-to-Edge Sharpness

    The SV193 is more than just a reducer; it is a dedicated field flattener designed to eliminate star distortion at the edges of the frame. The 3-element, 2-group optical design is fully multi-coated to maximize light transmission and contrast. Blackened lens edges further suppress internal reflections, ensuring a dark sky background and preventing stray light from degrading your final image.

    M48 Threads and 2-inch Barrel for Imaging Trains

    Integration with your existing equipment is seamless. The SV193 features a standard 2-inch barrel that slides directly into the SV503 102ED's focuser. On the camera side, it provides M48*0.75 male threads, the standard for connecting to DSLRs, mirrorless cameras with the appropriate T-ring, and dedicated astronomy cameras. The lightweight 177g construction ensures that it won't cause issues with focuser sag or mount balance.

  • Is the SVBONY SV193 compatible with telescopes other than the SV503 102ED?

    No, the SVBONY SV193 is optically matched specifically for the SVBONY SV503 102ED refractor. While it might physically thread into other systems, the optical correction for field curvature is calculated for the specific focal length and optical properties of the SV503 102ED. Using it with other telescopes will likely result in poor edge-of-field correction.

    What is the required back focus for the SVBONY SV193 reducer?

    SVBONY does not officially publish a required back focus distance for the SV193. Typically, reducers of this type require 55mm of back focus from the reducer's flange to the camera sensor. You may need to experiment with M48 extension rings to achieve perfect corner-to-corner sharpness with your specific camera.

    How will the SV193 reducer help me image the Orion Nebula (M42) with the SV503 102ED?

    The 0.8x focal reduction will allow you to capture the entire Orion Nebula complex, including the Running Man Nebula (NGC 1977) and the surrounding nebulosity, in a single frame with most APS-C or larger sensors. The faster focal ratio also means you can gather more signal with shorter individual exposures, which is ideal for resolving the fine details within the bright Trapezium region without overexposing it.

    Can I use filters with the SVBONY SV193 reducer?

    The SVBONY SV193 itself does not have dedicated filter threads on its telescope-facing side. To use 2-inch filters, you would typically place them in a filter drawer or filter wheel between the reducer and your camera, or thread them onto the 2-inch nosepiece of your camera if your imaging train configuration allows.

    Will the SV193 reducer help me capture the Pleiades (M45) with an APS-C sensor on my SV503 102ED?

    Yes, absolutely. The Pleiades star cluster is a large target that can be difficult to frame with the native focal length of the SV503 102ED and an APS-C sensor. The SV193's 0.8x reduction provides a wider field of view that is perfectly suited for capturing the entire cluster, including the faint, wispy nebulosity surrounding the main stars.

    What does the "3-element, 2-group" optical design of the SV193 mean for my images?

    This specification describes how the lenses are constructed inside the reducer. It uses three individual lens elements arranged into two cemented groups. This multi-element design is necessary to both reduce the focal length and flatten the image field simultaneously, correcting for optical aberrations and ensuring stars are sharp points from the center to the corners of your image.

  • Brand SVBONY
    Barrel Size 2 in
    Camera Connection M48*0.75
    Optical Design 3 Elements in 2 Groups
    Coatings Fully multi-coated
    Blackened Lens Edges Yes
    Net Weight 177g / 6.24oz / 0.39lb
  • SVBONY Warranty Policy