Yes, sorry!
{Studio/ Flash means professional photography?}
In working with flash photography.. the power of the light can 'eat' through your makeup and make you look washed out, (too light face) or look like you have nothing on (no foundation, no color etc.)
Sadly, each light type is different: Hard light, umbrella, softbox, etc.. each gives different results. It's a guessing game to see what works in each because each photographer lights his way. I can look at a lighting setup and 'guess' how it will look in the end.... though sometimes even I'm wrong... it's knowing your foundation products and knowing what results you'll get with each one.
For flash, an easy solution is to put a bit more foundation on then you think you need, but not so much that it's caked on... the light 'hits' the foundation and bounces off. And the process makes your skin look amazing in print. Primers are great for photography because it gives another 'layer' for foundation to sit on top of, and the light bounces off more without having to put more ON.
When digital photography came out, it made our work harder because not only do we have to apply more, but it has to now look perfect because now you SEE everything more... another guessing game....
whew! Hope it made sense..