There are many metrics for how well focused an image is. It is axiomatic among surgeons that, if there are many ways to perform a procedure, none of them are very good. So it is with deciding what’s in focus. This fine analysis doesn’t serve to inform practical photography, except for focusing wide angle lenses… [Read More]
Copying watercolors with the GFX 100
A friend of mine asked me to copy three 12×18 inch watercolors she had painted. To make it easy, she gave me a bunch of the same 12×18 inch cold press watercolor paper she’d used for them. I put the 45mm f/2.8 GF lens on a GFX 100, clamped the camera into a C1 on… [Read More]
Cambo AC-380 fine ratio geared focus
I’ve been using the Cambo Actus and the HR Digaron 180/5.6 for a while. One of the things that has bothered me is how difficult it has been to focus critically. The standard focusing adjustment mechanism is just too coarse. Combo has a fix for that. Like most Cambo products, it comes at considerable cost,… [Read More]
Are DOF calculators useful? — part 1
In this article, there is the following statement: How precise are tables and depth of field calculators? Usually most tables pretend to have a precision that is neither available nor sensible in reality. That is partly because the values calculated in the tables are based on the arbitrary specification of a limit value (acceptable circle… [Read More]
FF and MF DOF compared visually
A couple of days ago I posted visual examples of what various circle of confusion diameters (hereafter called CoCs) looked like at somewhat greater than 100% magnification with the 80 mm f/1.7 Fuji GF lens on the GFX 100S. That was in response to repeated discussion on some fora saying that the DOF calculators don’t… [Read More]
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