How do I change the aperture on a lens, if there is an adapter, preventing me from doing so?

[Ryan Elder]

Well it’s a zoom lens, not a prime though.

Look, with all do respect, even if a static camera on a tripod and nothing more is good enough for you, that is good enough for you. I feel I can do more than put a camera on a tripod, and I have done that a lot before, and want to do other things in filmmaking.

[Gary Huff]

[ryan elder] “Well it’s a zoom lens, not a prime though.”

A 300mm lens is not a zoom lens, it’s a prime lens. A 70-300mm would be a zoom lens.

[Ryan Elder]

Nope, I never use auto ISO and always manually set it. But it still changes exposure while zooming even if the ISO is locked.

[Gary Huff]

Then you shouldn’t be zooming in a shot.