Daystar Flat Cap Imaging Diffuser The DayStar FlatCap is a Gaussian diffuser that is temporarily installed over the front of your telescope when taking flat field reference images. 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. Note: Newton’s Rings or intereference fringes will not be corrected by flat fields; use our Interference Eliminator adapter to remove these before performing flat field correction. • Warning: The Daystar Flat Cap is NOT a solar filter.Not for use in a concentrated beam, FlatCap must be the first component to encounter light. This is a not a solar filter, eye or equipment damage will result unless used in combination with a safe solar filter or solar telescope. Technical Specifications FlatCap 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 diffuserIntensity distribution: GaussianDivergence angle: 4 degrees FWHMExposure time adjustment factor: 100x longerMaximum field of view: 1 degree with Sun backlightWavelength transmission range: 350-800nmOperating temperature: -10 to 100°C (14-212°F) Model Fitting FC90 fits 80-89mm tube OD or 63mm ERF FC100 fits 90-99mm tube OD FC110 fits 100-109mm tube OD or 80mm ERF FC120 fits 110-119mm tube OD or 90mm ERF FC130 fits 120-129mm tube OD or 100mm ERF FC140 fits 130-139mm tube OD FC150 fits 140-149mm tube OD FC160 fits 150-159mm tube OD or 130mm ERF FC170 fits 160-169mm tube OD FC180 fits 170-179mm tube OD or 150mm ERF FC190 fits 180-189mm tube OD FC210 fits 190-209mm tube OD In the Box Flat cap, at selected size Warranty & Manuals Daystar Warranty Daystar Recommends SharpCap imaging software
