Sony Handycam DCR-SR48 Handbook page 15

If you cannot record/play back images,
perform [MEDIA FORMAT]
If you repeat recording/deleting images for

a long time, fragmentation of data occurs on
the recording media. Images cannot be saved
or recorded. In such a case, save your images
on some type of external media first (p. 53,
see Operating Guide too), and then perform
[MEDIA FORMAT] (p. 62).
Carl Zeiss lens
Your camcorder is equipped with a Carl Zeiss
lens, which was developed jointly by Carl Zeiss,
in Germany, and Sony Corporation, and produces
superior images. It adopts the MTF measurement
system for video cameras and offers a quality
typical of a Carl Zeiss lens.
MTF= Modulation Transfer Function. The
number value indicates the amount of light from a
subject coming into the lens.
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