A larger sensor shows more of the edge of your image circle, and with that more vignetting. The DayStar flat cap FC190 attaches to the front of your telescope to create flat frames. Flats are shots of a uniformly lit surface that you compensate for when stacking with your light frames, so dark corners and shadows of dust disappear from the final result.
Whether you are with an astrocamera If you are using a system camera, the procedure is the same. First, check which size fits the front of your tube or fog cap, so that the cap fits properly and no stray light falls in from the edge inwards.
Make your shots preferably immediately after your recording session, without changing your focus or the position of your camera. If you want to learn the entire process from recording to editing, check out the astrophotography course.
If this size does not fit, please check the the flat cap FC210.








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