What is the minimum pupil diameter required to take images with the CR-2 AF?
The normal required pupil diameter is 4.0 mm or greater. However, when using the small pupil photography function, the CR-2 AF can capture retinal images through pupils as small as 3.3 mm in diameter, which is useful for patients with naturally small pupils.
From the official Canon Cr-2 Af Camera manual, page 47
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