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You do need a solid camera support – I’d not do this in my office where there is a slight spring in the floor boards (something I noticed in the early hours one morning when we had one of the UK’s minor and infrequent earthquakes). I’m doing the test in my kitchen, with a good solid tripod and a stone floor. It’s important to have the target far enough away from the camera, and there is a list of minimum suggested distances. Note that if you want to include such calibrations as part of a commercial service you will need to contact Reikan directly about an appropriate commercial license.
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The software is simple to install, but will need its license activating and also to work with your particular camera body (5 cameras can be registered at any one time and this list of 5 cameras can be changed multiple times). Note: Software available in other currencies.
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I’m testing the full ‘Pro’ version, but the basic version has the important AF adjustment aspect in it. The software is available in two versions directly from the developer. I printed out the file that came with the software, although Reikan do sell specially produced targets that are a bit more robust than my sheet of paper stuck to a sheet of cardboard. The target is a special one created for the process, with patterns that make it a lot easier for the software to calculate image sharpness. The photos are analysed and the best setting worked out. I should note that it can also work in ‘file mode’ where you just supply the photos for it to work on. The software offers many different functions, but I’ll concentrate on the the key reason for getting it, automation of the AF Calibration process.Īt its simplest, the software tells your camera (connected to the computer) to take a whole load of photos of a known test target, at different AF settings. Reikan are continually developing and improving functionality for this software such as recently making use of the dual pixel AF information now available from the 5D mk4
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I recently had a chance to try out Reikan FoCal Pro software on my MacBook Pro – there is a windows version of the software which is pretty much the same as you’ll see here. As I found out when testing the SpyderLensCal the differences are not always that clear and deciding on what settings are best can become a bit of a guessing game. One technique for setting optimal AF involves photographing a fine detail, high contrast target at a range of AF adjustment settings and deciding which is best. There are two possible adjustments for my cameras – a global one that’s applied to every lens, and individual bespoke ones to allow for lens to lens variation.
I’ll not go into all the ways your AF can be slightly off (a bang to the camera might misalign something ever so slightly) but the documentation for FoCal has some very well written notes on what is being addressed during any AF adjustment process, along with its limitations. The process is not difficult, but one you might quickly tire of if you’ve a lot of lenses. In the past I’ve calibrated the AF setup for individual lenses on my Canon 1Ds mk3 and more recently my 5Ds to try and remove these residual slight errors. There are complex reasons why AF performance is always a compromise and may vary (slightly) from shot to shot. What many people miss is that the actual AF setup, even for for a simple static shot, has a range of errors and inaccuracies that are simply there for practical engineering and manufacturing reasons. Some realise that modern autofocus performance can be tuned with better cameras, for different types of photography, so that what works for athletics might not be best for birds or even different sports.
Most people are so used to camera autofocus, they just accept it as something that should work.
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