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DayStar Filters Interference Eliminator (C mount)
DayStar Filters Interference Eliminator (C mount)
DayStar Filters Interference Eliminator (C mount)
DayStar Filters Interference Eliminator (C mount)

DayStar Filters Interference Eliminator (C mount)

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Estimated Arrival: Between Oct 10 and Oct 16. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.


Daystar Instruments products currently have a 3 week lead time. Thank you for your patience, it will be worth the wait!

Eliminate waves of interference on monochromatic solar images with this handy adapter. C thread on front and rear.


Photographers imaging in monochromatic light, such as Hydrogen-Alpha, using an electronic sensor frequently encounter a wavy pattern of light and dark lines superimposed over their images. These lines are called interference fringes, interference patterns, or Newton's Rings. In long focal ratio applications, the nearly parallel light can internally reflect inside the image sensor or camera, causing an addition or subtraction of the light waves, resulting in the observed pattern.

The Interference Eliminator solves this problem by tilting the camera off normal while keeping the center of the image sensor stationary, so that focus, framing, and vignetting are not changed with the tilt. The tilt changes the angle of incidence and optical path lengths inside the image sensor, mitigating the interference.

Left: normal, problematic image. Right: With Interference Eliminator.
Telescope/filter: DayStar SolaREDi, tuned off band. Camera: Canon EOS 5D.


Installation: The Interference Eliminator should be placed directly in front of the camera in the optical train. For proper operation, the distance from the flange of the male C thread to the camera focal plane should be 17.5mm. On a C mount camera, no spacers are required, but a CS-mount camera will require a 5mm spacer for the best effect. If the distance is significantly different from 17.5mm, the camera will move off boresight and the focus position will shift while adjusting the Interference Eliminator tilt setting.

Use: Slightly loosen the thumbscrews and slide the two halves of the Interference Eliminator apart, such that the camera tilts. Take a few images with the camera to check for the interference pattern. Slide further apart if the pattern is still evident. Tilt it the minimum amount to eliminate fringes - too far and focus could be lost at the top and bottom of the image, especially in fast focal ratio systems. If the maximum tilt is reached without satisfactory effect, try full tilt in the opposite direction. In some severe instances, the interference pattern may not be completely removable, but it will be reduced to where other techniques such as flat fielding or compositing can make the image acceptable.


Camera compatibility

Digital cameras such as Pt. Grey, Lumenera, Imaging Source, and many more CCD and CMOS cameras.

Telescope/filter compatibility

Recommended for long focal ratios (F/30) such as DayStar Filters


Male/Female 'C' thread, 1-32 UN.



Additional back focus required


Radius of curvature



0.2 lb CNC machined aluminum

Maximum camera weight



We know that once you've placed your order, you are anxious to receive it! We make every effort to get your order shipped out to you as quickly as possible.

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. We will process the charges to your credit card and your order will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at

Standard shipping time in the US is between 3-5 business days, though it can vary slightly depending on the destination. We typically For updates on your shipment you can enter your tracking number here.

We distribute nationwide via UPS and Fedex. Unfortunately, at this time we are not able to provide expedited or international shipping.

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