If you shoot with a fixed setup, you want to take flat shots without changing anything in your setup. The DayStar flat cap FC210 attaches to the front of your telescope for that purpose. You can use it to create flat frames: shots of a uniformly lit surface through your own optics, which allows stack software to eliminate vignetting and the shadows of dust on your sensor and filters.
Measure the outer diameter of the front of your tube or hood and choose the cap that fits it, because a cap that fits well keeps stray light out. If your measurement does not match this size, please compare it with the flat cap FC190.
If you take your shots, you prefer to do it immediately after your light frames, with the same focus, the same camera setting and the same filter. electronic focuser This helps because you don't have to touch the focus manually and therefore you won't accidentally distort it when you place the cap.
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