Change white balance in greenscreen studio when changing focal length

[lenny87]

Hello there,

I am new when it comes to filming professional in a green screen studio and i have got some beginners questions:

-When i film in a green screen studio with a zoom lens 14-42 mm and i have set my white balance whilst the lens was on 14mm. Do i have to set a new white balance as soon

as i change the focal length to 25mm?  Cause changing the focal length of my lens also automatically changes my aperture.

Thanx in front

Greetz Lenny