Hi, I am wondering if stressed lens cell could cause those kind of star shapes.
I heard this somewhere but I am not sure if that is my case.
Here are my gears:
Telescope: at80edt (80mm triplet refractor form Astronomics)
Flattener: above refractor's dedicated reducer/flattener x 0.8
Camera: nikon d5300 full-spectrum modded (APS-C)
Filter: IDAS 2" light pollution suppression filter D1
Image train looks like:
D5300 - T ring - flattener - 2" filter
I also guide with a separate guide scope. (so no diffraction from oag prism)
The flattener screws directly into the focuser, and the filter comes before the flattener.
Here are the star shapes I am concerned with. Please take a look at the bright stars near the corners.
I don't have perfect back distance from the flattener, but the spike-like effects on stars seem like they are from some other cause.
What do you think....?
I will really appreciate any ideas or advises. Thank you so much.
Edited by betelgeuse91, 07 April 2020 - 01:52 PM.