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Daystar Instruments FLAT CAP
Imaging Diffuser

Taking a Flat field reference image removes the effects of dust spots, vignetting, and filter uniformity.

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.

This product is manufactured in the USA.

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.

Specifications:
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)

FC90 FlatCap
fits 80-89mm tube OD
or 63mm ERF
$69.00
FC100 FlatCap
fits 90-99mm tube OD
$69.00
FC110 FlatCap
fits 100-109mm tube OD
or 80mm ERF
$69.00
FC120 FlatCap
fits 110-119mm tube OD
or 90mm ERF
$69.00
FC130 FlatCap fits 120-129mm tube OD
or 100mm ERF
$69.00
FC140 FlatCap fits 130-139mm tube OD
$69.00
FC150 FlatCap fits 140-149mm tube OD
$69.00
FC160 FlatCap fits 150-159mm tube OD
or 130mm ERF
$79.00
FC170 FlatCap fits 160-169mm tube OD
$79.00
FC180 FlatCap fits 170-179mm tube OD
or 150mm ERF
$79.00
FC190 FlatCap fits 180-189mm tube OD
$79.00
FC210 FlatCap fits 190-209mm tube OD
$79.00

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.

Daystar Recommends SharpCap imaging software

Tutorial about how to use Flat Cap for image corrections

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.

For further specific information about availability,
please contact sales staff at:  866-680-6563 for further details.

Please read our Terms of Sale before purchasing

* HALF-BANDWIDTH: The term half-bandwidth refers to an optics industry standard of measure.  On a chart depicting the peak where light is transmitted, that peak's width is measured at the point 50% between zero and full transmission. This term is called half-bandwidth.

Offering absolute precision control over wavelength transmission. . .

DayStar Filters LLC • 149 Northwest OO Highway • Warrensburg, MO 64093 - USA
Telephone: 866-680--6563 • service@daystarfilters.com • FAX: 1-866-791-0448