In part, one of this series I looked at the feasibility of building at autofocus calibration target that’s good enough to use to adjust a camera without concern over error. Specifically I focused in on how much error in the target’s flatness and alignment can be tolerated while still operating inside the smallest step the [...]

In part 3 of my series on designing and building an autofocus adjustment target, I look at the alignment of the camera and target.

While the target’s construction tolerances are important, if there is nothing to focus on and no scale to read, none of that matters. The non-obvious part is that how the target is designed can seriously affect how the auto focus system performs. A brief overview of Auto Focus If you’ve ever used a manual focus [...]

Design and build yourself a scrim. Why a scrim? Put simply, it’s a highly versatile light modifier that costs pennies to make.