Optolong L-Ultimate gradiant issue

[Opriulian]

Hi All,

I reciently got the 2" Optolong L-Ultimate filter, as i am shooting from a Bortle 9 area, and i noticed a severe gradiant of red on one side and blue on the other.

I wanted to check if anyone else has this and what causes it? and if its normal or an issue with my filter.

I am using an Quattro 150 and ZWO 533MC.

Thanks and clear skies.

Light_M81_300.0s_Bin1_20231107-220310_0001.fit Flat_1.1s_Bin1_20231108-072916_0001.fit