Thanks to everyone. Yes, I do realize that I have lots of reading to do. However, as a mathematician I sometimes find some of the articles a bit handwavy and lengthy for the information they provide. So I was asking for a quick formula, and thanks a lot. So, I have a bulldog 4x5 DIY camera , my minimum lens extension is around 100mm and maximimum about 180mm ish. This doesn't seem to be very good, basically only allowing 90mm lenses, am I right?
And also, which formula relates f stops to depth of focus? For pinhole cameras, everything is in focus. So, by stopping down heavily, I could account for the limitied lens extension ?!
Thanks to everyone!
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