You can always use the mug method if no dedicated contraptions are at hand so you have two fixed optical planes and make things for the auto focus easier.
You can always use the mug method if no dedicated contraptions are at hand so you have two fixed optical planes and make things for the auto focus easier.
i didn't know this was an actual thing that others did as well xD i just randomly thought of it. very cool to see that im not the only one :P