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Timings & File Sizes

The EOS 350D is a significantly better performer than the EOS 300D. Power On time is now virtually instant, record review faster, play back is faster, continuous shooting is both faster and has a larger buffer and file write (CF throughput) has more than doubled. Overall a very good performance which with the exception of continuous shooting rate actually puts it on a par with the EOS 20D.

Timing Notes: All times calculated as an average of three operations. Unless otherwise stated all timings were made on a JPEG Large/Fine (3456 x 2304) image (approx. 2,500 KB).

The media used for this test were:

  • 1 GB SanDisk Extreme III CF card (Type I)
  • 1 GB Lexar Pro 80x CF card (Type I)
  • 4 GB Lexar Pro 80x CF card (Type I, FAT32)
Action
Details
Time, secs
(SanDisk 1 GB)
Time, secs
(Lexar 1 GB)
Time, secs
(Lexar 4 GB)
Power Off to On *1   <0.5 <0.5 <0.5
Power On to Off   <0.2 <0.2 <0.2
Record Review
RAW
1.2 1.2 1.2
Record Review
JPEG
1.1 1.1 1.1
Play *2
RAW
0.7 / <0.3 0.7 / <0.3 0.7 / <0.3
Play *2
JPEG
1.0 / <0.3 1.0 / <0.3 1.0 / <0.3
Play Image to Image *2
RAW
0.6 / <0.1 0.6 / <0.1 0.6 / <0.1
Play Image to Image *2
JPEG
0.8 / <0.1 0.8 / <0.1 0.8 / <0.1

*1 This timing was taken from the moment the power switch was turned to on to the moment the camera's AF system started to focus (by holding down the shutter release from power on).
*2 The first timing is if the image hasn't been viewed recently, the second is if it has, the 350D appears to cache images which have been recently viewed and hence can display them more quickly.

Continuous Drive mode

To test continuous mode the camera had the following settings: Manual Focus, Manual Exposure (ISO 200, 1/400 sec, F5.6). Measurements were taken from audio recordings of the tests. The tests carried out below measured the following parameters for both JPEG (Large/Fine) and RAW:

  • Frame rate - Initial frame rate, this was always 2.9 fps (+/- 0.05 fps)
  • Number of frames - Number of frames in a burst
  • Buffer full rate - Frame rate if shutter release held down after burst (buffer full)
  • Next full burst - How soon after you can take another full burst

The media used for these tests were:

  • 1 GB SanDisk Extreme III CF card (Type I)
  • 1 GB Lexar Pro 80x CF card (Type I)
  • 4 GB Lexar Pro 80x CF card(Type I, FAT32)

Burst of JPEG (Large/Fine) images

Timing
1 GB SanDisk
1 GB Lexar
4 GB Lexar
Frame rate 2.9 fps 2.9 fps 2.9 fps
Number of frames 27 25 23
Buffer full rate 1.8 fps 1.8 fps 1.7 fps
Next full burst 6.4 sec 6.2 sec 6.7 sec

Burst of RAW images

Timing
1 GB SanDisk
1 GB Lexar
4 GB Lexar
Frame rate 2.9 fps 2.9 fps 2.9 fps
Number of frames 6 6 6
Buffer full rate 1.0 fps 0.9 fps 0.5 fps
Next full burst 5.8 sec 5.8 sec 6.3 sec

Interpreting the above results we can see that the frame rate for the initial burst of shots is always 2.9 frames per second. Shooting JPEG Large/Fine you can expect to be able to shoot between 27 and 23 frames in a burst (with a fast CF card), after this the burst rate will drop to approximately 1.8 frames per second continuously. If we shoot a burst then wait it should take only six seconds before the entire burst has been written away and we can shoot another full burst again.

The EOS 350D's continuous shooting capability is transformed compared to the EOS 300D, it shoots both faster and for longer thanks to a bigger buffer, faster processing and better CF throughput. You can fire off almost thirty JPEG shots in a burst compared to the EOS 300D's four shots. This is also noticeably better than most of the competition, certainly at the sub-$1000 end of the market.

File Flush Timing

Timings shown below are the time taken for the camera to process and "flush" the image out to the storage card. Timing was taken from the instant the shutter release was pressed to the time the CF activity indicator beside the LCD monitor went out. The EOS 350D will begin writing images as soon as it can and continue to write 'in the background' while you take further shots / change settings.

The media used for this test were:

  • 1 GB SanDisk Extreme III CF card (Type I)
  • 1 GB Lexar Pro 80x CF card (Type I)
  • 4 GB Lexar Pro 80x CF card (Type I, FAT32)
Image type
Time, secs
(SanDisk 1 GB)
Time, secs
(Lexar 1 GB)
Time, secs
(Lexar 4 GB)
Approx.
size
3504 x 2336 RAW + JPEG *1 2.6 2.7 2.9 9,490 KB
3504 x 2336 RAW 1.9 2.0 2.0 6,990 KB
3504 x 2336 JPEG Fine 1.2 1.2 1.2 2,500 KB
3504 x 2336 JPEG Standard 1.0 1.0 1.0 1,250 KB
2544 x 1696 JPEG Fine 1.0 1.0 1.0 1,480 KB

*1 File size reported here is the size of the RAW and JPEG files added together.
*2 The 350D begins writing approximately 0.7 seconds after the shutter release is pressed so you must subtract 0.7 seconds from the above timings to get the actual write time.

Unless you're shooting RAW + JPEG you shouldn't expect a single write event to take longer than two seconds and shooting JPEG around one second. This is very fast and means that the EOS 350D empties its buffer very quickly and never leaves you waiting to take the next shot. As you can see from the results below the EOS 350D produced an almost identical write performance as the EOS 20D, around 4.7 MB/sec for JPEG's and 5.6 MB/sec for RAW files (more than twice as fast as the EOS 300D). Considering the EOS 350D's budget pricing this is a very good performance.

Card performance: JPEG Fine burst

Card Canon EOS 350D, write speed (JPEG Fine files)
1 GB SanDisk Extreme III 4,948 KB/sec
1 GB Lexar Pro 80x 4,867 KB/sec
4 GB Lexar Pro 80x (FAT32) 4,586 KB/sec

Card performance: RAW burst

Card Canon EOS 350D, write speed (RAW files)
1 GB SanDisk Extreme III 6,152 KB/sec
1 GB Lexar Pro 80x 5,836 KB/sec
4 GB Lexar Pro 80x (FAT32) 5,818 KB/sec

Cardbus 32-bit CF Adapter benchmark

Card Cardbus 32-bit CF Adapter, write speed (RAW files)
1 GB SanDisk Extreme III 10,091 KB/sec
1 GB Lexar Pro 80x 9,188 KB/sec
4 GB Lexar Pro 80x (FAT32) 9,279 KB/sec

The results above were produced by measuring the write time for a burst of shots, this gives a more accurate measurement of actual throughput. Note that the CF cards used were all high speed and in our fastest device (the Delkin Cardbus 32-bit CF Adapter) were capable of around 9.8 MB/sec.

Battery life

The EOS 350D uses a smaller NB-2LH Lithium-Ion battery which provides 720 mAh at 7.4 V, that's about 65% of the capacity of the EOS 300D's BP-511 battery and about half of some batteries used in other digital SLR's. Despite this the NB-2LH appears to provide good lasting power, we used the 350D at PMA 2005 for our show report images, well over 300 shots per day and didn't get a battery warning indicator once. Canon claim that the NB-2LH is capable of delivering the same number of shots as the BP-511 did in the EOS 300D, 600 shots without the flash and 400 with 50% flash usage.

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Comments

Pascal Parvex
By Pascal Parvex (2 months ago)

Bought this version (Rebel XT) for about $350 two years ago, refurbished. Still works well and has a good image quality.

0 upvotes