DayStar FlatCap Imaging Diffuser

The DayStar FlatCap Imaging Diffuser is a Gaussian diffuser that is temporarily installed over the front of your telescope when taking flat field reference images.

DayStar FlatCap Imaging DiffuserTaking a Flat field reference image removes the effects of dust spots, vignetting, and filter uniformity. By strongly blurring the Sun, the only details you will see in the reference image are from defects in your imaging train that can be removed in software. Daystar Recommends SharpCap imaging software with the FlatCap.

The FlatCap is not a solar filter and is not for use in a concentrated beam. The FlatCap must be the first component to encounter light. It is a not a solar filter, eye or equipment damage will result unless used in combination with a safe solar filter or solar telescope.

The DayStar FlatCap Imaging Diffuser is sold by inside diameter of the mounting cap. Measure the outside diameter of the frontmost component of your telescope or ERF, and then round up to the next larger size. For example, a telescope with a 160mm front should use model FC170, and then optionally install the included felt pads for a secure fit.


– Construction: Spun Aluminum mounting ring with polymer diffuser

– Intensity distribution: Gaussian

– Divergence angle: 4 degrees FWHM

– Exposure time adjustment factor: 100x longer

– Maximum field of view: 1 degree with Sun backlight

– Wavelength transmission range: 350-800nm

– Operating temperature: -10 to 100°C (14-212°F)

You can learn more here.

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