What is the minimum pupil diameter required to take images with the CR-2 AF, and what can I do if the pupil is too small?
The CR-2 AF requires a pupil diameter of 4.0 mm or greater under standard conditions. If the patient's pupil does not dilate enough, the small pupil photography function can be used, which allows imaging through pupils as small as 3.3 mm in diameter. (Page 47)
From the official Canon Cr-2 Af Camera manual, page 47
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