Hello guys and gals,

I own an Arca Swiss F-Line Basic.

My question is as follows:

I was reading Quang-Tuan Luong's article regarding determining the proper f-stop and while for the most part the article made sense and was written quite clearly, I find that I do need some clarification regarding the process.

When measuring the position on the near and far focus spread where do I measure from? Or does that even matter as long as I am consistent? (ex: the gap between the front and rear function carriers measured from the base, or should I measure the distance between the inside of each format frame taken at a point from the center of each format frame?) I’m just not clear about this and how one takes movements into account.

I have attached an image to help illustrate what I’m asking here.

Thanks in advance for your help.

-Daniel