The image below features the frames captured using a DSLR camera with a William Optics Zenithstar 61 telescope on the Heart Nebula. Each one is often necessary to produce the best possible image from your raw data. Larger telescope objectives, such as a Newtonian Reflector may find an artificial lighting solution more effective.įlat frames are 1 of 3 important support (calibration) files amateur astrophotographers use to calibrate images. The modest aperture of this apochromatic refractor makes capturing flat frames easier, as there is less area to cover. The telescope used in this video was an Explore Scientific ED102. The early morning sky is bright enough to create a successful flat frame, as long as you diffuse the light using a white t-shirt or similar translucent material. The idea is to evenly illuminate the field. The telescope uses the t-shirt as a filter when pointed at a bright source of light such as the dawn sky. I use what is known as the “White T-Shirt method” outlined by the creator of DeepSkyStacker in the FAQ section. This video tutorial will help you visualize the process of taking flat frames.
This technique is affectionately known to the DSLR astrophotography community as, “the white t-shirt method”. The method I have described for taking flats on this page is most useful for those shooting with a DSLR camera such as the Canon EOS Rebel T3i I currently own. Like many aspects of deep-sky astrophotography, your method of taking flat frames will vary depending on the equipment you use. The uneven field illumination and vignetting in my deep sky images were a real pain to correct in post-processing. Now, I know that flat frames are as important as taking dark frames.
This is often a question I get from beginners that are just getting started in deep-sky astrophotography.Įarly on, I was guilty of skipping calibration frames such as flats and bias frames. Once you know what to look for, taking successful “flats” is easy with both a DSLR or CCD camera.
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Learning how to take flat frames is an essential step for any deep-sky astrophotography enthusiast. How to take Flat Frames for Astrophotography
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