Most DSLR cameras using Phase Detect autofocus will always focus with the lens wide open, and stop the aperture down to take an image. Note that this may or may not affect the aperture at which the focus system is used, depending on the camera.
Use this option to change the aperture at which images are taken and analysed.
Many: FoCal will test a lot of different Focus Adjustment settings. Normal: A good spread of different settings are tested. Few: Only a few different Focus Adjustment measurements are tested. This option allows you to adjust how many different measurements are taken. Test Point AmountįoCal will take a set of measurements at various points across the Focus Adjustment range. 
You would normally leave this setting on Normal, but if you are experiencing results that vary between tests you may want to change the setting to Tight.
Tight: This will instruct FoCal to keep taking shots until several are reporting very similar measurement results, giving a higher confidence that this is the typical measurement value. Normal: FoCal will take a number of shots at each setting, moving on when confident that the typical measurement value has been determined. This is not recommended for normal operation, but can be useful in some advanced cases. None: Only a single shot will be taken at each Focus Adjustment setting. This option allows you to tell FoCal how consistent you would like these results. 
Ideally, the measurements would be identical for each shot but in reality, this will never happen (see An Introduction to Autofocus for lots more information). The default settings are usually suitable, but the Settings tab offers test options:Ĭalibration Test Settings Test Point Consistency Levelįor Autofocus Calibration, a number of measurements are taken at each Focus Adjustment value.
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