The next step is to see how close to perfect focus we are. If this is a little confusing, keep reading as it should become clearer… Step 2 – Focus in one direction The red horizontal line shows the level of the best shot so far. There is no scale, it just shows whether a shot is sharper (the bar taller), or not as sharp (the bar shorter) than other shots.
This chart shows relative quality levels between the shots you take. The camera performed a focus operation, then FoCal measures the quality and shows the result as a blue bar (same as the Contrast Detect button) on the small chart on the right of the screen. To do this, hit either the Phase Detect or Contrast Detect button (note: some cameras do not support one or other of these focus methods and the button will be disabled)Ībove, we hit the Contrast Detect button.
Read the second below on Lens Focus Hysteresis for an explanation of performance on older/lower quality lenses) Step 1 – Use the camera autofocusįirst, we’ll use the camera autofocus to get an approximately good starting focus. (Note that this example is with a well-behaved lens. Here’s an example of how the utility can be used. The utility takes measurements of the sharpness of the image, and allows you to control the focus position and watch the changes so you can find the best focus. Here’s an example of the screen a few seconds after hitting the Start button: Hit the Start button and in a few seconds FoCal will get information from the camera and show you a zoomed live view image. When you open the utility, you’ll see a window similar to this: To open the Target Setup utility in Aperture Sharpness test mode, simply click the Target Setup button from within the Aperture Sharpness test: Opening the Aperture Sharpness Target Setup utility Further information on this functionality is available at Target Setup Overview. It’s important to ensure the standard Target Setup checks pass appropriately as well – you can see this if you select the Check panel on the right side. To assist with this, the Target Setup utility – when started from within the Aperture Sharpness test – offers extra functionality. The Aperture Sharpness test only produces representative results if the camera lens is focused as well as possible on the target. Target Setup Utility – Aperture Sharpness
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