Description

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 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)

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

 

 

Fitting	80-89mm OD or 63mm ERF, 90-99mm OD, 100-109mm OD or 80mm ERF, 110-119mm OD or 90mm ERF, 120-129mm OD or 100mm ERF, 130-139mm OD, 140-149mm OD, 150-159mm OD or 130mm ERF, 160-169mm OD, 170-179mm OD or 150mm ERF, 180-189mm OD, 190-209mm OD