I'm of a more ramshackle mentality, but even my loosey-goosey philosophies hit a limit.
fyi, this particular doc was about people that are trying to help conserve raptor migration through SoCal. So, lots of bird shots. Which we don't really do, nor have done.
The whole thing became kind of a production experiment. We were only answering to ourselves so we could take risks like that.
The scope of the project kept changing, but the finances never did. There was very little money in our pockets, and what we did have we needed to save for travel. And being a seriously-non-affluent-filmmaker, it basically came down to a make-do-as-we-can process. Our personal finances, as well as the various situations of the shoot, were all over the place.
We were borrowing/renting lenses and gear in a very haphazard way. Sometimes it worked. Mostly it did not. Meanwhile, the stuff we had in our own collection was inferior. For instance we used a POS Vintage Photax 500mm w/2x extender for an entire season to get a lot of the BIF shots. That was an insanely unfortunate thing to do, but it's what we could afford to have on hand.
The biggest bitch was not having a real tripod. We truly wished we had friends/colleagues that could have let us use a pro Sacthler or Miller. More than willing to carry some sort of hefty rig into the wild if it would've allowed smooth shots when filming at a +2000mm FF equiv. That FOV reach is f'in hard to control.
As a side note, it was pretty wild running around with birders carrying equipment that was so expensive and professional while us "filmmakers" were often using, basically, consumer toys to grab video.
At the end of the day, the images are passable by a certain standard, but when you pixel peep you can tell it's all held together with spit, bubblegum, hopes, and prayers. "f8 and be there" was the mantra we had to talk ourselves into and accept. "The best camera is the one you got."
...That sort of thing.