Sony MVC-CD350Sony updates its CD-based digicam line with a new 3 megapixel model.<<Exposure & Flash :(Previous) | (Next): Operation & User Interface>> Page 7:Shutter Lag & Cycle Time TestsReview First Posted: 06/18/2003 |
Shutter Lag/Cycle Times
When you press the shutter release on a camera, there's usually a lag time before
the shutter actually fires. This time is to allow the autofocus and autoexposure
mechanisms time to do their work, and can amount to a fairly long delay in some
situations. Since this number is almost never reported on, and can significantly
affect the picture taking experience, we now routinely measure it using an Imaging
Resource proprietary test system.
NOTE: My qualitative characterizations of camera performance below (that is, "reasonably
fast," "about average," etc.) are meant to be relative to
other cameras of similar price and general capabilities. Thus, the same
shutter lag that's "very fast" for a low-end consumer camera might
be characterized as "quite slow" if I encountered it on a professional
model. The comments are also intended as only a quick reference: If performance
specs are critical for you, rely on the absolute numbers to compare cameras,
rather than my purely qualitative comments.
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Power On -> First shot | |
Highly
variable. The longer time is for a new disc, the shorter one if the
disc hasn't been changed since the camera was last turned on, and
there are few files on it. Takes longer for more files on an unknown
disc, fastest for empty disc that was in the camera before it was
turned off. |
Shutdown | |
Fairly
fast, assuming it isn't writing to the disc. Can take up to 33.4 seconds
if you just snapped a series of shots that filled the buffer, and
up to 64 seconds if you just shot a TIFF-mode image. |
Play to Record, first shot | |
Time
until first shot is captured, from "instant review" mode
or normal playback mode. Very fast. |
Record to play (max/min res) | 3.28/4.16 |
Images
appear quickly as a low res version, then "fill-in" within
a few seconds. First time in each set is for camera sitting idle in
record mode to start with. Second time is for immediate switch to
playback mode after snapping a photo. Quite a bit slower than average,
due to the relatively slow CD data rate. |
Shutter lag, full autofocus | |
VERY (!) fast, particularly at wide angle lens setting. Even telephoto is faster than most camera's wide-angle performance. Great for sports! |
Shutter lag, manual focus | |
A bit faster than average. |
Shutter lag, prefocus | |
Very
fast. |
Cycle Time, max/min resolution | 1.54 |
Quite fast for first 6 shots in large/fine mode, then drops to 5.2 seconds per shot. In VGA/normal, cycle time is 1.54 seconds for a very large number of shots. |
Cycle time, TIFF mode | 61.6 | Quite slow. |
Cycle time, continuous mode ("Burst 2") |
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Moderately fast, burst of only two frames though. (Max/min res performance is the same.) |
Shutter lag on the CD350 is among the very best of any camera I've tested,
an amazing 0.33 seconds with the lens set to its wide-angle position. Even at
telephoto, the CD350's autofocus is faster than that of most cameras with the
lens set to wide-angle. Manual focus speed is a bit faster than average, but
prefocus time is blazing. (Great for sports.)
Cycle times are quite good also, and the CD350 has a 6-frame buffer for shots
in large/fine mode. It's odd though, that the camera can only grab two frames
in succession in continuous mode. (Which Sony calls "Burst 2.")
Like other models in the Mavica series, the CD350 starts up from power-off fairly
slowly, because the camera has to check the disc to see how much space is left,
and where the next image should be stored. The camera obviously has a trick
or two up its sleeve in this area although: If you load a new disc (or just
open and shut the back door with the power off), the camera somehow knows it
has to scan the entire disc to determine space and where the next picture will
go. This takes 22 seconds. If you just shut the CD350 down without removing
the disc although, the next time it starts up, it seems to recognized the disc,
and startup time is reduced to only 2.4 seconds. Shutdown time is about average,
unless the camera is in the process of writing to the CD, in which case, it
can take anywhere from a few seconds to a full minute for the camera to fully
shut down after you hit the power switch..
Other than the long startup and record-to-playback times, the CD350 is a surprisingly
responsive camera: In fact, it has about the fastest shutter response of any
consumer-level camera I've tested to date.
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