The shift of the center wavelength of a filter can be accurately quantified by a model of the center wavelength λ vs. angle of incidence θ .
With a steep F3 light cone, I suspect you are seeing an intensity transmission effect, which attenuates the light transmission the more you go off axis.
CCDI is probably interpreting these dimmer (hence smaller) stars off axis as some for of field curvature....which it isn't.
QED.
|