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Daystar Interference Eliminator - T mount

Daystar Interference Eliminator - T mount

by Daystar Filters
SKU DAY-MG0408
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
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  • Eliminates interference fringes (Newton's Rings) in monochromatic imaging
  • Maintains image centering and focus by tilting around the sensor's center
  • Designed for the standard 55mm back focus distance of T-mount systems
  • T-mount threads for compatibility with DSLRs, CCD, and CMOS cameras
  • Reduces image artifacts common in Hydrogen Alpha solar and nebula imaging
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Daystar Interference Eliminator - T mount

    The Daystar Interference Eliminator is a T-mount camera tilter engineered to remove Newton's Rings from monochromatic images by enabling precise sensor adjustment while adhering to the standard 55mm back focus distance. It is a critical tool for imagers using Hydrogen Alpha filters with sensors up to full-frame 36x24mm, where internal reflections in long focal ratio systems can create destructive interference patterns that ruin otherwise perfect data.

    Eliminate Newton's Rings in Monochromatic Astrophotography

    When imaging in a narrow bandpass like Hydrogen Alpha, nearly parallel light from a long focal ratio telescope can reflect internally between the layers of a camera sensor. These reflections cause interference—a wavy pattern of light and dark lines known as Newton's Rings or interference fringes—that can be impossible to remove with flat frames alone. This T-mount tilter directly solves this by altering the optical path within the sensor to cancel the effect.

    Precision Tilt Adjustment Without Losing Your Target

    The Interference Eliminator's design allows you to tilt the camera sensor off-normal while keeping the center of the sensor stationary. This is a crucial distinction from simpler tilt plates; because the pivot point is the optical axis, you can adjust the tilt to remove fringes without shifting your target's framing or changing the primary focus point. You simply loosen the thumbscrews, apply the minimum tilt needed to make the pattern disappear in a test exposure, and retighten.

    A key trade-off in any tilt system is edge-of-field focus. While this device is optimized to prevent it, applying excessive tilt, especially in fast focal ratio systems, can lead to soft focus at the top and bottom of the frame. The goal is always to use the smallest adjustment necessary.

    Critical Setup: Maintaining the 55mm T-Mount Back Focus

    For the central pivot mechanism to work correctly, the distance from the flange of the male T-thread to your camera's focal plane must be exactly 55mm. With a DSLR and a standard T-ring, this distance is achieved automatically. For a dedicated astronomy camera (CCD or CMOS), you may need to add T-thread spacers to reach the 55mm standard.

    If this distance is incorrect, adjusting the tilt will cause the camera to move off boresight and shift the focus position, defeating the device's primary ergonomic advantage. While the tilter will not cause vignetting on 1.5-1.6x crop sensors, some vignetting is possible on full-frame (36x24mm) sensors at maximum tilt due to the mechanical nature of the T-thread interface.

  • Why am I seeing wavy lines in my Hydrogen Alpha images with the Daystar Interference Eliminator?

    Those wavy patterns are interference fringes, or Newton's Rings, caused by internal reflections in your camera sensor. The Daystar Interference Eliminator is designed to fix this. Simply loosen the thumbscrews and apply a small amount of tilt to the camera body. Take test shots until the pattern is minimized or gone, then retighten the screws.

    How does the Daystar Interference Eliminator work without changing my image framing?

    The device is engineered to tilt the camera around the exact center of the image sensor. This means that while the angle of the sensor changes, its central point remains on the telescope's optical axis. This clever design prevents the image from shifting, so you don't have to re-center your target after making an adjustment, provided the 55mm back focus distance is correctly maintained.

    Will the Daystar Interference Eliminator cause vignetting with my full-frame camera on an f/10 SCT?

    It's possible, but usually minimal. On large, full-frame (36x24mm) sensors, some slight vignetting can occur when the tilter is set to its maximum angle. This is due to the physical aperture of the T-threads. However, you should only need a very small amount of tilt to remove fringes, and at minimal settings, vignetting is typically not an issue. On smaller APS-C (1.5-1.6x crop) sensors, no vignetting will occur.

    Do I need spacers to use the Interference Eliminator with my astronomy camera?

    Possibly. The Daystar Interference Eliminator requires a precise 55mm distance from its mounting flange to the camera sensor. If you are using a DSLR with a standard T-ring, this distance is met automatically. For most dedicated astronomy cameras, you will need to use a combination of T-thread extension tubes or spacers to achieve the required 55mm back focus.

    I'm imaging the Veil Nebula (NGC 6960) and the rings are very strong. Will this device completely remove them?

    In most cases, yes. The tilter is highly effective at mitigating interference patterns. However, in some severe instances, the pattern may not be completely removable. Even in these cases, the Daystar Interference Eliminator will significantly reduce the intensity of the fringes to a level where standard processing techniques, like flat-fielding, can easily correct the rest.

    What happens if I install the Daystar Interference Eliminator at a distance other than 55mm?

    If the distance from the flange to the sensor is not 55mm, the device's central pivot point will no longer align with the center of your sensor. As a result, when you adjust the tilt, the camera will move off its boresight, your target will shift in the frame, and the focus position will change. Maintaining the 55mm spacing is critical for proper operation.

  • Daystar Filters Warranty