>>3188892Thanks for the info. Also, it is a digital camera with a pinhole cap on 68mm of extension tubes. I've been swapping pinholes like you see in the OP and testing them out. 68mm tubes + 46.50mm flange focal distance (Nikon F-mount D3400) = 115.5mm which needs a hole 0.453mm in diameter.
Which is larger than what I have right now, I think. Here's the calculations, I think I did it correctly. I'll have to play around with punching more holes later.
>fyi the pics in the OP are using just the lens cap on the body, nothing else 