Alright, so I am new to the photography and videography. I purchased a Sony a6300 when it came out for the 4k video recording since we have a green screen in our office and we do 10-15minute snap shot videos. As of now, I have been using the default lens. I'm currently looking at buying the FE 100 - 400mm F4.5-5.6 GM OSS or FE 70 - 200mm F2.8 GM OSS but prior to making this decision I wanted to ask the community for help. We film indoors, and we have a lighting kit. I also film on the streets in front of certain environments to give a diverse range of back drops. We also use still photography. I have been reading on the differences of f2.8 vs. f4.5 and from what I can tell, it seems if I'm in low light / indoor places the 2.8 is better, otherwise they are equal. Is that the correct understanding? Help is appreciated!