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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.
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 SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA
SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA

SVBONY SV503 70mm f/6.78 Quadruplet ED Flatfield Refractor Telescope OTA

par SVBONY
UGC SV-F9359E
$359.00 - $359.00
$359.00
$359.00 - $359.00
$359.00
Égalisation de prix!
  • 70mm Aperture Quadruplet Astrograph
  • 474mm Focal Length (f/6.78)
  • 32mm Corrected Flat-Field Image Circle
  • 2.5" Rack-and-Pinion Focuser
  • 127.5mm Working Distance
  • FPL51 and Lanthanum ED Glass Elements
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Alerte de retour en stock
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • SVBONY SV503 70mm f/6.78 ED Flatfield Refractor

    The SVBONY SV503 70 refractor is a purpose-built astrograph, combining a 70mm aperture and 474mm focal length into a compact f/6.78 optical system. Its 4-element design, featuring FPL51 and lanthanum glass, delivers a fully corrected 32mm flat-field image circle, eliminating the need for a separate flattener. Weighing just 5.9 lbs, this telescope provides a generous 127.5mm of working distance from its 2.5" focuser for complex imaging trains.

    Quadruplet Optics: A 32mm Flat-Field Imaging Circle

    The SV503 70 integrates a 2-element objective with a 2-element corrector, creating a 4-element "quadruplet" design that corrects for field curvature internally. This system produces a 32mm diameter image circle with 100% correction, ensuring pinpoint stars across the frame of popular APS-C and smaller astronomy cameras. The use of FPL51 and lanthanum glass in the objective minimizes chromatic aberration for high-contrast images with true-to-life color.

    Imaging-Ready Mechanics: 2.5" Focuser and 127.5mm Back Focus

    Engineered for astrophotography, the SV503 70 features a robust 2.5" rack-and-pinion (RAP) focuser capable of supporting heavy camera packages without flexure or slippage. A critical feature for imagers is the 127.5mm (5") of working distance available from the 2" receptacle. This generous back focus provides ample room for adding accessories like filter wheels, off-axis guiders, and rotators into your optical train, while the M54x0.75 female thread offers a direct, secure connection.

    Wide-Field Astrograph: 474mm Focal Length for Large Targets

    With its 474mm focal length, the SV503 70 is ideal for capturing expansive celestial objects that are too large for longer telescopes. This field of view is perfectly suited for framing the entirety of the Andromeda Galaxy (M31), the North American Nebula (NGC 7000), or vast star-forming regions in Cygnus. The f/6.78 focal ratio provides a good balance between image scale and exposure time, making it an efficient instrument for gathering light on faint deep-sky targets.

    SV503 70 vs. a Standard ED Doublet: Integrated Flattener Advantage

    While a standard 70mm ED doublet refractor may have a lower initial cost, it requires a separate field flattener to achieve the same photographic results as the SV503 70. This adds complexity and potential frustration in getting the spacing correct. The SV503's integrated quadruplet design offers a significant advantage:

    • No Spacing Calculation: The flattener is built-in and permanently fixed at the optimal distance. You simply attach your camera and focus.
    • Reduced Connections: A simpler, more rigid imaging train means less potential for tilt or flexure.
    • Cost-Effective System: When factoring in the price of a quality external flattener, the SV503 70 often represents a better total value for a complete imaging setup.

  • What size camera sensor is the SVBONY SV503 70 best suited for?

    The SVBONY SV503 70 provides a fully corrected, flat-field image circle of 32mm. This is ideal for cameras with APS-C format sensors and any smaller sensors, ensuring sharp, pinpoint stars from corner to corner without vignetting.

    Can I use the SVBONY SV503 70 for visual observing out of the box?

    No. This telescope is an astrograph, meaning its focus point is optimized for a camera sensor placed far behind the focuser. To use it visually with an eyepiece, you will need to add a diagonal or a 2" extension tube to achieve focus.

    How would the SV503 70 frame a large target like the Andromeda Galaxy (M31)?

    The 474mm focal length of the SV503 70 is perfectly matched for large targets. When paired with a typical APS-C camera, it allows you to capture the entire Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 in a single, well-composed frame.

    What accessories can I connect to the SV503 70's 2.5" focuser?

    The focuser terminates in a 2" receptacle and also has a female M54x0.75 thread for direct connections. With 127.5mm of back focus, it provides ample space to install a complete imaging train, including:

    • Filter wheels or filter drawers
    • Off-axis guiders (OAGs)
    • Field rotators
    • Your astronomy camera

    Is the SVBONY SV503 70 a good choice for imaging nebulae from my backyard?

    Yes. Its f/6.78 focal ratio is efficient for collecting data on faint nebulae. From a light-polluted location, pairing the SV503 70 with a duo-narrowband filter is highly effective for isolating the hydrogen-alpha and oxygen-III signals of emission nebulae like the Lagoon Nebula (M8) or the Eagle Nebula (M16).

    What kind of mount do I need for the SVBONY SV503 70?

    The telescope tube and its included accessories weigh only 5.9 lbs (2685g). This lightweight design makes it an excellent match for portable German equatorial mounts with a payload capacity of 10-15 lbs or more, such as a Sky-Watcher Star Adventurer GTi or similar tracker.

  • Brand SVBONY
    Aperture 70mm / 2.8"
    Focal Length 474mm / 18.7"
    Focal Ratio f/6.78
    Objective Type 2-Element ED lens with FPL51 and lanthanum special glass
    Corrector 2-element corrector installed in the tube
    Corrected Image Circle 32mm / 1.3" (100% correction)
    Focuser 2.5" RAP focuser with 2" reduction adapter and M54x0.75 female thread
    Working Distance 127.5mm / 5" (from 2" receptacle)
    Tube Length (min) 365mm / 14.4"
    Tube Diameter 82mm / 3.2"
    Dew Shield Diameter 93mm / 3.7"
    Tube Weight (incl. accessories) 2685g / 5.9lb

    • Download Manual

    • SV503 70mm f/6.78 OTA

      × 1

    • 2" to 1.25" Adapter

      × 1

    • Lens Cover

      × 1

    • Telescope Tube Rings

      × 1 Pair

    • Dovetail Plate

      × 1

    • 1.25" Dust Cover

      × 1

  • SVBONY Warranty Policy