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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.
Lunt .8X Reducer/Field Flattener
Lunt .8X Reducer/Field Flattener

Lunt .8X Reducer/Field Flattener

by Lunt Solar Systems
SKU LSS-CAA-RF
$449.00 - $449.00
$449.00
$449.00 - $449.00
$449.00
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  • Reduces focal length by a factor of 0.8x
  • Widens the photographic field of view
  • Flattens the image field for sharp, edge-to-edge stars
  • Optimized for solar and night-sky astrophotography
  • Multi-coated optics for high contrast
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Lunt .8X Reducer/Field Flattener

    The Lunt .8X Reducer/Field Flattener is an essential astrophotography accessory that reduces your telescope's focal length by a factor of 0.8x, delivering a wider, flatter field of view for framing the entire solar disk or large prominences in a single shot.

    A 0.8x Focal Reduction for Wider Solar Fields

    This accessory decreases your telescope's effective focal length by a factor of 0.8x, expanding your camera sensor's field of view. This is critical for imagers who need to capture large-scale solar features or wide night-sky vistas without resorting to mosaics. The integrated flattener ensures the entire frame, from center to edge, remains sharp and free of distortion, a crucial feature for producing high-quality images.

    • Multi-Coated Optics: Ensures maximum light transmission and minimizes internal reflections for high-contrast views of delicate solar details like filaments and spicules.
    • Durable Construction: Housed in a lightweight yet sturdy aluminum body, it adds minimal weight to your imaging train, preserving your mount's balance and tracking accuracy.

    The 0.8x Advantage in Solar Imaging

    By reducing the focal length, this accessory also "speeds up" your optical system, lowering its effective f-ratio. A faster system allows you to use significantly shorter exposure times, which is the key to freezing atmospheric turbulence and capturing razor-sharp solar details. For high-frame-rate solar imaging, this reduction in exposure time can be the deciding factor between a soft image and a scientifically valuable one.

  • What does the Lunt .8X Reducer/Field Flattener primarily do?

    The Lunt .8X Reducer/Field Flattener serves two main purposes for astrophotography. It reduces your telescope's focal length by 0.8x to provide a wider field of view, and it flattens the image field to ensure stars and solar details remain sharp across the entire sensor, from corner to corner.

    How does the Lunt .8X Reducer affect the f-ratio of an f/10 telescope?

    It makes the telescope "faster" by reducing the f-ratio. To calculate the new f-ratio, you simply multiply the original f-ratio by the reduction factor. For an f/10 telescope, the new photographic f-ratio would be f/8 (10 x 0.8). This allows for shorter exposure times, which is critical for freezing atmospheric seeing during solar imaging.

    Is the Lunt .8X Reducer recommended for visual observing?

    No, this accessory is designed specifically for astrophotography. While it may come to focus visually in some setups, its optical corrections are optimized for a flat sensor, not the human eye. For visual use, an eyepiece with a longer focal length is the correct way to achieve a wider true field of view.

    Why is a "Field Flattener" important for the Lunt .8X Reducer?

    Most telescopes naturally produce a curved focal plane, which means that if the center of your image is in focus, the edges will be slightly out of focus, causing stars to appear elongated. A field flattener corrects this curvature, ensuring the entire image projected onto your camera's flat sensor is perfectly sharp, a non-negotiable feature for serious astrophotography.

    Will the Lunt .8X Reducer work with my DSLR or a dedicated astronomy camera?

    Yes, the Lunt .8X Reducer is designed to be compatible with a wide range of cameras, including DSLRs, mirrorless cameras, and dedicated CMOS/CCD astronomy cameras. You will need the appropriate T-ring and adapters to achieve the correct spacing for your specific camera model.

    How does the Lunt .8X Reducer help when imaging the full solar disk?

    Many telescope and camera combinations produce an image scale that is too large to fit the entire Sun on the sensor. By reducing the focal length by 0.8x, this accessory effectively "zooms out," allowing you to frame the full solar disk and any surrounding prominences in a single exposure, avoiding the need for complex and time-consuming mosaics.

  • GTIN LS130-.8CAAFF

    • Lunt .8X Reducer/Field Flattener

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  • Lunt Solar Systems 5-Year Warranty