uit EOS 1D IV white paper:
The AF sensor’s basic configuration and focusing optics are similar to those of the EOS-1D Mark III. However, there are now 39 cross-type AF points available for manual AF point selection. (Note that these 39 points work as cross-type points only during manual AF point selection. During automatic AF point selection, the same 19 AF points as on the EOS-1D Mark III will work as
cross-type points.)
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In the past, Canon AF system development concentrated on achieving fast response. Highly responsive AF systems offer accurate predictive AF (they focus quickly on subjects in the AF frame), but they have difficulty stabilizing focus if the subject leaves the AF frame during AI Servo AF continuous shooting. The 1D Mark III, highly responsive by design, consequently has a lower probability of accurately focusing on fast-moving subjects that are hard to keep within the AF frame.
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note : AHA dus daar zat het probleem. Initiele focus was super idd, maar volgen is daarna een probleem ...
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Predictive AF is more intelligent and avoids over-response, and difficult lighting — both low contrast and very bright conditions — is handled better. Canon has conducted numerous field tests with professional photographers both in the US and abroad and the resulting feedback has helped to make the algorithm precisely suited to the shooting needs of pro users.
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note: jammer dat ze Rob G er niet bij betrokken hebben ..
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In sum, the success rates for focusing moving subjects and for subjects whose distance keeps changing, as is often the case in hand-held close-up shooting, are substantially improved
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note: dat willen we horen.
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Based on user requests, the frame rate has been changed to conform to the NTSC/PAL format and motion picture standard. The frame rate for HD and SD quality has been doubled compared to the EOS Rebel T1i, making videos look less jerky for fast-moving subjects and action. (The frame rate for SD quality is also twice as fast as the EOS 5D Mark II.)
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microphone will pick up AF motor noise. Automatic focusing during video capture is thus not recommended. There will be no focus confirmation beeper sound during video capture, if focus is lost and re-achieved with AF. There is no continuous autofocusing as found in video cameras.
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In the world of digital SLRs, crop factor is defined as the ratio of the diagonal of a full 35mm frame, 43.2mm, to the diagonal of the frame in question. It often comes up in considerations of how lenses will work on various camera bodies. Smaller sensors have larger crop factors. The EOS 5D Mark II has a crop factor of 1. The EOS-1D Mark IV’s is nominally 1.3 and the EOS 7D’s is 1.6. A 50mm lens has an effective focal length of 50mm on a 5D Mark II, 65mm on an EOS-1D Mark IV and 80mm on an EOS 7D, in terms of angle of view. On a pro camcorder with a 2/3'' sensor, the crop factor of 3.93 yields an effective focal length of 196.5mm for a 50mm lens. These numbers help to quantify the new realms of focus differentiation that are achievable with Canon’s new HD video-capable DSLRs.
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The video output from the camera’s A/V OUT or HDMI terminal during Live View or video recording will appear in the 4:3 aspect ratio (dotted red line in the figure given here), as displayed on the camera’s LCD monitor. Therefore, when the output is displayed on a 16:9 TV set, the picture size will not fill the
frame. The video itself will be recorded in the size (Full HD, HD or SD) that was set.
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Note: dat is dan weer jammer als je een Marshel LCD aan wilt sluiten, mar goed, iets is beter dan niets.
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[ Bericht 8% gewijzigd door ebeaydojraes op 13-11-2009 00:23:19 ]
- "Was Ik Maar Een Dichter, Dan Kon Ik Dichter Bij Jou Zijn!"
- 'ye cannae change the laws of physics'
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