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Kait Photography

Brisbane based photographer

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Astrophotography Twilight Flat Fields

Interested in photography? At kaitphotography.com.au you will find all the information about Astrophotography Twilight Flat Fields and much more about photography.


How to build a flat field box for astro imaging - BBC Sky …

    https://www.skyatnightmagazine.com/advice/build-a-flat-field-box/
    Twilight flat fields can work well, provided the sky is uniform just after sunset. But you need to wait until the Sun is about 5˚ below the horizon …

Using a Flat Field Panel for Astrophotography

    https://astrobackyard.com/flat-field-panel/
    A flat field panel can help you create a uniformly lit flat frame to correct uneven field illumination in your astrophotography images. This issue can arise …

How to Take Flat Frames for Astrophotography [The Easy …

    https://astrobackyard.com/how-to-take-flat-frames/
    By stretching a plain white t-shirt over the telescope objective, you create an even flat field when pointed at a bright light source. Stretch a plain white t-shirt over …

Flat Field Panels | aavso

    https://www.aavso.org/flat-field-panels
    Flat Field Panels. I built a flat field panel using an 11x11" EL panel. It is sandwitched behind a diffuser panel and foam board with light attenuated further with white artist paper. Two pieces of foam board are in front with aperture holes for my 8" and 6" OTAs so they form fit over the end of the OTA.

Introduction to FLATs - Al's Astrophotography Blog & Gallery

    https://alberts-astro.com/AP_Blog/2009/12/238/introduction-to-flats/
    Gather the individual Lights, Darks, Flats, and Flat-Darks you intend to use. Stack the Darks and Flat-Darks into a master Dark and master Flat-Dark. Subtract the master Flat-Darks from the individual Flats. Stack the individual subtracted Flats to a master Flat. Subtract the master Dark from the individual Light frames.

Spike-a Flat Fielder

    http://www.spike-a.com/flatfielders/
    When doing this, optical imperfections are greatly magnified. The Spike-a Flat fielder can correct those imperfections quickly and easily! To use the panel, point your telescope at zenith (straight up) and place the panel gently on top of your telescope. Center the panel for the best results. Take your flats on your schedule. No need to wait for the narrow window at twilight.

Why does this twilight sky flat field have a grid of dark …

    https://astronomy.stackexchange.com/questions/6032/why-does-this-twilight-sky-flat-field-have-a-grid-of-dark-pixels
    The image below is a small region of a twilight flat field. A grid of darker pixels with 728x36 cell dimensions can be seen. The camera used was the SBIG STL-6303 according to the FIT headers, which uses a Kodak KAF-6303E CCD according to the online data sheet. The CCD dimensions, these cell dimensions, and all the binning options are all perfectly divisible, so I'm assuming …

Imaging – Dark Frames & Flat Fields – Star-Gazing

    https://www.star-gazing.co.uk/WebPage/guides/imaging-dark-frames-flat-fields/
    The most prominent one is towards the top of the image left of centre. The other one towards the bottom of the image, just left of centre. These can be removed by using flat field images when the subs are stacked. A flat field is taken in almost the opposite way to the dark frames. This is normally done in the daytime.

testing the qhy600m for spectral flatness - AMATEUR …

    https://www.amateurastrophotography.com/testing-the-qhy600m-for-spectral-flatness
    As you can see, the presence of a quarter moon increases the overall brightness by about a factor of two, and more so for near infrared wavelengths. As you can see, the gold standard for astrophotography, a twilight flat, is not very representative of a dark night, having WAY too much near infrared light.

Questions about flat frames - Beginning Deep Sky …

    https://www.cloudynights.com/topic/706030-questions-about-flat-frames/
    Questions about flat frames - posted in Beginning Deep Sky Imaging: Hi All, Ive very recently started astrophotography using my Sony RX10 Mk 1 camera with (35mm equivalent) 24-200 mm lens at 24 mm with camera set at ISO 800 and Raw. For my first stacking attempt, I did not use flat frames. Now I tried taking some using the white t-shirt method per How to take Flat …

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