Pentax 645D vs Sony A100

On this page, we will be contrasting the Pentax 645D vs Sony A100, former being a Pro DSLR while the latter is a Entry-Level DSLR by companies Pentax and Sony. There is a considerable difference among the sensor resolutions of the 645D (40MP) and A100 (10MP) and the 645D (Medium format) and A100 (APS-C) posses totally different sensor dimensions.

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The 645D was announced 3 years later than the A100 and that is a fairly large difference as far as camera tech is concerned. The two cameras have different body design with the Pentax 645D being a Large SLR camera and the Sony A100 being a Compact SLR camera.

Before we go into a step-by-step comparison, here is a concise summary of how the 645D scores vs the A100 in regards to portability, imaging, features and an overall rating.

Following is a preview of the gallery photos for Pentax 645D & Sony Alpha DSLR-A100. The whole galleries are available at Pentax 645D Gallery & Sony A100 Gallery.

If you're planning to carry your camera regularly, you are going to need to consider its weight and measurements. The Pentax 645D features physical measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") with a weight of 1480 grams (3.26 lbs) and the Sony A100 has proportions of 133mm x 95mm x 71mm (5.2" x 3.7" x 2.8") having a weight of 638 grams (1.41 lbs).

Compare the Pentax 645D vs Sony A100 in our newest Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will vary dependant on the lens you select at that time. The following is a front view dimension comparison of the 645D versus the A100.

Looking at size and weight, the portability score of the 645D and A100 is 50 and 64 respectively.

In many cases, its difficult to envision the difference in sensor sizing just by seeing specifications. The photograph below will offer you a clearer sense of the sensor sizing in the 645D and A100.

To sum up, both of these cameras provide different resolutions and different sensor sizing. The 645D with its bigger sensor will make achieving bokeh simpler and the Pentax 645D will show greater detail with its extra 30 Megapixels. Higher resolution will help you crop photographs more aggressively. The more modern 645D is going to have an edge when it comes to sensor innovation.