A7III vs A7IV - Sensor IR sensitivity

[Giulio]

HI All, 

I use an A7IV Astro-modified to H-Alpha - hence not full spectrum - and use a so called OWB (Original White Balance) filter for daily shot. My issue is that with daylight, Auto WB or manual Kelvin, the OWB filter doe snot seem to work well in all type of lights. The filter was produced in first instance for the A7III and I wonder whether a difference in IR sensitivity between the 2 cameras can cause the reddish hue on the A7IV.  This might be caused by a light leackage due to the filter not fitting properly, but that's a second though I will explore later.

I did not try to connect with Sony yet, it seems rather an adventure to go with this kind of questions, unless someone can share an workable email ....

Any suggestion is welcome.

Thanks

 

Giulio