Canon 1D MIII vs Pentax 645D

Lets look much closer at the Canon 1D MIII and Pentax 645D, both Pro DSLR digital cameras by manufacturers Canon and Pentax. There is a considerable difference between the image resolutions of the 1D MIII (10MP) and 645D (40MP) and the 1D MIII (APS-H) and 645D (Medium format) offer totally different sensor size.

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The 1D MIII was introduced 4 years before the 645D which is quite a large difference as far as tech is concerned. Both of these cameras have the same body design (Large SLR).

Before getting into a more detailed comparison, here is a brief summation of how the 1D MIII grades vs the 645D with respect to portability, imaging, features and an overall score.

This is a preview of the gallery photos for Canon EOS-1D Mark III & Pentax 645D. The whole galleries are viewable at Canon 1D MIII Gallery & Pentax 645D Gallery.

If you're going to carry around your camera regularly, you have to factor in its weight and volume. The Canon 1D MIII has outer measurements of 156mm x 157mm x 80mm (6.1" x 6.2" x 3.1") accompanied by a weight of 1335 grams (2.94 lbs) whilst the Pentax 645D has sizing of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs).

See the Canon 1D MIII and Pentax 645D in our newest Camera & Lens Size Comparison Tool.

Remember that, the weight of an ILC will differ depending on the lens you have during that time. Below is a front view dimensions comparison of the 1D MIII versus the 645D.

Taking into consideration size and weight, the portability grade of the 1D MIII and 645D is 51 and 50 respectively.

Oftentimes, it is very hard to envision the difference between sensor sizes purely by reading technical specs. The image below will help give you a better sense of the sensor measurements in the 1D MIII and 645D.

As you have seen, both of those cameras have different megapixel count and different sensor sizes. The 1D MIII with its tinier sensor will make shooting shallow depth of field more difficult and the Pentax 645D will deliver extra detail using its extra 30 Megapixels. Higher resolution will also help you crop photographs a bit more aggressively. The more aged 1D MIII is going to be disadvantaged when it comes to sensor innovation.