Okay folks, thanks for inspiration. Another try:

definitely better!

Did you try the "o" with the font instead of an actual circle? If you stick with circle, perhaps same height as other letters?

In any case do you know about https://opensourcedesign.net/#page-top

I think a font "o" would completely defeat the concept I had :P But it is the same height, isn't it? I guess it's minimally off...

Well, no, because an aperture/pinhole does can be ellipsoidal

My pixel sense was tingling...

Ellipse is not what most photo/optics people are going to think of XD