Canon EOS-1D Mark II Review
Exposure / Focus / Metering / Drive modes (cont.)
Auto Focus modes
One Shot AF
|AI Servo AF
In this mode the camera constantly refocuses on a moving subject. If the subject is moving at a constant rate towards or away from the camera the focus system will 'predict' the new focus distance. This is especially successful when AF point selection is set to auto (the camera can use all 45 focus points to track a moving subject). In this mode the focus confirmation light only indicates if focus can not be achieved (it blinks).
| P.Fn 13 allows you to switch AI Servo auto focus between focus-priority (default) and shutter release-priority.|
| C.Fn 20 can be used to change the AI Servo tracking sensitivity (standard, slow, moderately slow, moderately fast, fast) so that focusing isn't thrown off if (example) something crosses the path of the lens.|
| C.Fn 21 allows you to select between focus priority (default) or shooting priority AI Servo|
Partial metering is more effective for strongly backlit subjects, metering is weighted at the center of the frame covering 13.5% of the viewfinder area.
Spot metering is useful for metering very precisely a single subject or area within a scene. The metering is weighted at the center of the frame covering 3.8% of the viewfinder area. With AF points limited to 11 or 9 (custom function 13 is 1 or 3) the metered spot will follow the AF point.
In this mode the entire frame is metered but more emphasis (weight) is placed on the center portion of the frame.
| P.Fn 2 allows you to disable any of the metering modes.|
The EOS-1D Mark II can shoot eight megapixel images at a rate of 8.5 frames per second and buffer up to 40 frames before dropping down to a slower shooting rate. This adds up to a sensor to buffer data rate of approximately 100 MB/sec compared to the EOS-1D's 50 MB/sec, we can also estimate that the EOS-1D Mark II employs a 512 MB buffer, the EOS-1D needing only around 128 MB.
|High speed continuous (8.3
Press and hold the shutter release and the camera shoots at its highest frame rate (approx. 8.3 frames per second) until the buffer is full. As soon as there is space in the buffer (images have been written out to the CF card) the next shot will be taken. Personal function 19 allows you reprogram this high speed frame rate to approx. 4, 5, 6, 7 or 8.3 fps. See table below for estimated number of frames at different ISO sensitivities.
|Low speed continuous (3 fps)
Press and hold the shutter release and the camera shoots at its low frame rate (approx. 3 frames per second) until the buffer is full. As soon as there is space in the buffer (images have been written out to the CF card) the next shot will be taken. Typically at this lower speed, with a fast CF card and at ISO 100 you can shoot until the card is full. See table below for estimated number of frames at different ISO sensitivities.
|Self-timer 10-sec delay
Camera pauses 10 seconds before taking shot. Countdown is displayed on the top LCD.
|Self-timer 2-sec delay
Camera pauses 2 seconds before taking shot. Countdown is displayed on the top LCD.
|*1|| P.Fn 19 allows you to reprogram continuous modes to 8,7,6,5,4 fps and 3,2,1 fps respectively.|
| P.Fn 20 allows you to limit the number of shots in continuous mode, when this setting is enabled the camera will only shoot the specified number of frames for any single press-and-hold of the shutter release button.|
Looking through the viewfinder the camera displays the current available space in the camera's buffer as a two digit numeric (right side of the viewfinder display). This buffer burst capacity at different ISO sensitivities (these are camera estimates, real burst capacity will depend on scene complexity, noise and CF card write speed):
|Sensitivity||Est. JPEG L||Est. RAW||Est. RAW + JPEG L|
|ISO 50 (L)||40||20||18|
|ISO 3200 (H)||29||18||17|
Top of camera controls (right)
Right side of camera controls
|Button / combination|
|Acquires a flash exposure
lock, attached flash will pre-flash and meter for the correct flash
Also used in Multi-spot metering mode to select a meter point.
|Illuminates top or rear LCD status panels with blue LEDs for six seconds.||No function|
|Select exposure compensation:
+/-3 EV in 1/3 or 1/2 EV steps *1
|AE Lock - lock exposure as it is currently metered, this allows you to then recompose the image and shoot.|
|Enter AF point select
Main dial dial (top) used to select AF points horizontally, quick command dial (rear) used to select AF points vertically.
|*1|| Exposure compensation steps can be set to 1/3 or 1/2 EV via C.Fn 6.|
| C.Fn 4 allows you reprogram the function of the shutter release and AE Lock buttons to various combinations of AF / AE Lock.|
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