At face value, a measured dynamic range of 10.5EV seems low for the EOS-1D Mark IV, but I didn’t notice any restriction in the range when shooting real-world photographic images. The fairly steep mid-section of the dynamic-range curve indicates good midtone contrast, which helps convey the impression of detail. At the shadow end the curve dips sharply, indicating a compression of the tones in this area. Support & Service Start of repairs for AF Mirror Adjustment Issue". Archived from the original on 2009-10-16 . Retrieved 2009-10-25. As I write this, the demand for this camera is huge - you basically need to get on a list to get one even after over 3 months of its initial release (unless you are willing to pay a huge premium). Another way to look at this - The 1D III essentially makes all of your lenses useful in 1/2 as much light as before.

Previous EOS-1 models have also used an anti-static coating on the anti-aliasing filter to make it harder for dust to gain a foothold in the first place. The 1D Mark IV uses Canon's latest generation fluorine-based coating, which purportedly improves this dust resistance property. Dust particles frequently carry static charges, so the anti-static coating avoids one of the key mechanisms by which dust particles adhere. Canon has also adopted a special shutter-curtain coating designed to greatly reduce the shedding of particles, and a different plastic in their DSLR body caps, one less prone to creating shavings that can drop into the mirror box. The workload of processing the wealth of available information from the AF and light source sensors to perform autofocus calculations is shared between two 32-bit RISC processors -- the Canon 1D Mark IV's main 40MHz CPU, and a dedicated 48MHz autofocus CPU. Since the 1Ds II has more resolution, I wanted to see the comparison with the 1Ds II image 78% downsized in Photoshop to match the 1D III - thus the additional set of crops. Evaluative metering (linked to all AF points), Partial metering (approx. 13.5% of screen, at center), Spot metering (approx. 3.8% of screen), Centerweighted average meteringThe above set of samples were shot under a bare 60w tungsten light bulb and a custom white balance was used - just as I'd shoot in the same real world conditions. Things have gotten much better since, but I'm only moderately satisfied with this feature at this time.

Canon EOS-1D Mark III digital camera specifications". Digital Photography Review. Archived from the original on 2010-03-10 . Retrieved 2009-10-25.

The APS-H sensor on the Canon 1D Mark IV means that it has a smaller angle of view (by a factor of 1/1.3x) than a full-frame camera with any given lens. While most properly called a "crop factor," the 1.3x ratio is most commonly referred to as the "focal length multiplier," since that's how it works in practice: Any lens used on the Canon 1D Mark IV will have the same field of view as one with a 1.3x greater focal length will when attached to a 35mm camera. For example, a 100mm lens on the Canon 1D Mark IV will show the same field of view as a 130mm lens on a camera with a 35mm frame size. The shutter is an electronically controlled focal-plane shutter. Its maximum speed is 1/8,000 of one second. The shutter is operated by an electromagnet.

Although the EOS-1D Mark IV is quoted as having an APS-H-sized sensor like its predecessor, it is interesting that the dimensions of the imaging device have actually shrunk marginally from 28.1×18.7mm in the EOS-1D Mark III to 27.9×18.6mm in the new camera. As before, this puts it between an APS-C and a full-frame device, and it produces a 1.3x focal length magnification factor. However, this isn’t the only difference between the two sensors. For many people, the most important point is that the effective pixel count has been increased from 10.1 million to 16.1 million, and this has necessitated a drop in pixel size (in microns) from 7.2×7.2µm to 5.7×5.7µm. I have been extremely happy with my 1Ds II - it is an awesome camera, so generating this feeling is not an easy accomplishment. Shown above are two of the image review/information screens that make good use of the 1D Mark III's new LCD real estate. Each JPEG size (L, M1, M2, S) can be set to a quality level of 1 to 10 (1 high compression, low quality - 10 low compression, high quality) Like all other Canon EOS-1 series cameras, the Canon EOS-1D Mark IV accepts the full range of EF lenses available for full-frame cameras. Because its APS-H sensor is larger than those of Canon's consumer and enthusiast SLRs, it can't use the EF-S lenses Canon manufactures for use on APS-C cameras. The same applies to lenses with sub-35mm image circles available from third-party manufacturers as well.The EOS 1D Mark III is a professional 10.1 megapixel digital single lens reflex camera (DSLR) camera body produced by Canon. The EOS 1D Mark III was announced on February 21, 2007 [3] and is the successor of the Canon EOS-1D Mark II N and was first released in May 2007. In late 2009, the camera was succeeded by the Canon EOS-1D Mark IV. One of the main benefits of the new Mark III, over the previous models, was the added functionality of Live view, allowing users to take pictures while looking at an LCD screen. While it had the same outdated software as the older 1D series cameras, it had a much improved button layout, which is still used today. It also had improved wireless capabilities (with the optional WFT-E2 wireless adapter) over the Mark II. The new WFT-E2 was much smaller than the previous WFT-E1 for the Mark II. The new transmitter could now also connect via a USB port. This allowed the optional addition of a GPS unit and wired PC connectivity.

Although I am sure the sound of the EOS-1D Mark IV firing continuously would alert a nearby deer to a photographer’s presence, the mirror-movement dampening is much better than that in the Sony Alpha 900. Build and handling

Memory Cards

When experimenting with some files shot in daylight conditions, we found that once the green channel had clipped in the JPEGs, then highlight recovery was impossible from a file exposed 0.33EV more (there's less that 0.33EV headroom above what's in the JPEGs in daylight). However, in the red channel we were able to recover highlights from a file exposed 1EV beyond the point where the channel had clipped in the JPEGs. This disparity means that you can expect to recover around 1EV of detail in the highlights but that color accuracy is likely to drop off after as little as 0.33EV if the green channel has clipped. JPEG version High-magnification, wide-coverage viewfinder and improved focusing screen with 100% finder coverage I'm not bad at capturing a moment with a single shot (it is the primary way I shoot on my 1Ds II), but 10 fps will usually get me the best shots. Enjoy high quality performance, low cost prints and ultimate convenience with the PIXMA G series of refillable ink tank printers.