Faint cross around stars brighter than 5 mag

john9999

Hi,

I using a AP 155 f7.5 refractor and ZWO ASI 294 MC pro camera. Every time I shoot an object which contains 5 mag or brighter stars are in the field, a faint cross of light appears near all 5 mag or brighter stars. This is present in all my images which contains 5 mag or brighter stars. My other cameras does not have this problem. Attach is an example of the problem.

Thank you for all your help

John Maikner

katherine.tsai

Hi Sir,

It is normal to see this.

john9999

Why is this normal? I do not this effect on other cameras I use?

katherine.tsai

Could you tell us what other cameras do you use?

john9999

ZWO ASI 1600MC PRO, FLI16830, Nikon 5100, Nikon 5300, Canon t3i ASI 071MC PRO DOES HAVE NOT THE PROBLEM

katherine.tsai

I am sorry about the problem you are going through.

This may be the relfection inside the senser.

I have to tell you there is no way to solve this problem now.:(

This model of sensor (Panasonic MN 34230) does not have AR coating, so it has the possibility to show reflections of the bright star, and not only 1600MM, all cameras which use this model of sensor have such problems.

we've raised our suggestion to the manufacture, but the sensor factory does not care about the astronomy market: (

it's a small market compares to others.

So we do not have idea how to solve it right now.

mcerono

my 294mc pro does not produce this crosses on bright stars BUT if the transparency is very bad due to high humidity I get these aswell, but only then!