If you’re shooting with multiple filters, each filter has its own filters and therefore requires its own filters. The DayStar flat cap FC104 makes that work easier. You place it in front of the opening and take shots of an evenly lit flat surface for each filter using the same camera and focus as your real shots. When editing, you can remove dust, spots and vignetting from your astro photos.
Are you working with a filter wheel or filter tray, Then, after your light frames, rotate all the filters and create a series of flat images per filter. The cap must fit the outer diameter of your tube or mist cap, so measure that first.
Do not change the focus or camera angle after your session before you take the flats. This way, any smudges and vignetting will be exactly where you see them in your footage. If this does not match your measurement, please compare it with The flat cap in size FC110.
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