Sony Handycam HDR-XR500V Owner's Manual page 33

See page 121 on the recordable number of photos.
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To change the image size, touch

IMAGE SIZE]  a desired setting 
[
You can record photos during movie recording by pressing PHOTO ([Dual Rec], p. 35).
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Your camcorder flashes automatically when there is insufficient ambient light. The flash does not work
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during movie recording. You can change how your camcorder flashes by [FLASH MODE] (p. 83) .
You cannot record photos while
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(HOME)  (SETTINGS)  [PHOTO SETTINGS] 
 
is displayed.

(p. 81).