Sony Handycam DCR-TRV240 Operating Instructions Manual page 40

Recording still images on a tape – Tape Photo recording
To use the tape photo recording function during normal CAMERA recording
You cannot check an image on the screen by pressing PHOTO lightly. Press PHOTO
deeper. The still image is then recorded for about seven seconds, and your camcorder
returns to the standby mode.
To record clear and less fluctuated still images
We recommend that you record on "Memory Stick"s.
You can record still images on "Memory Stick"s even in CAMERA mode. (P.124)
(except DCR-TRV240)
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