Pentax 645D vs Sony A300

On this page, we will be comparing the Pentax 645D versus Sony A300, former being a Pro DSLR while the latter is a Entry-Level DSLR by companies Pentax and Sony. There exists a large gap between the sensor resolutions of the 645D (40MP) and A300 (10MP) and the 645D (Medium format) and A300 (APS-C) boast totally different sensor size.

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The 645D was revealed 2 years later than the A300 and that is quite a serious difference as far as technology is concerned. Both of the cameras have different body design with the Pentax 645D being a Large SLR camera and the Sony A300 being a Compact SLR camera.

Before getting straight to a comprehensive comparison, here is a concise view of how the 645D grades versus the A300 when it comes to portability, imaging, features and an overall rating.

The following is a preview of the gallery images for Pentax 645D & Sony Alpha DSLR-A300. The full galleries are available at Pentax 645D Gallery & Sony A300 Gallery.

If you are intending to carry your camera often, you need to consider its weight and proportions. The Pentax 645D enjoys exterior dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") along with a weight of 1480 grams (3.26 lbs) while the Sony A300 has measurements of 131mm x 99mm x 75mm (5.2" x 3.9" x 3.0") and a weight of 632 grams (1.39 lbs).

Check the Pentax 645D versus Sony A300 in our completely new Camera plus Lens Size Comparison Tool.

Always remember, the weight of an ILC will differ dependant on the lens you have chosen at that moment. Here is a front view over all size comparison of the 645D versus the A300.

Factoring in dimensions and weight, the portability rating of the 645D and A300 is 50 and 64 respectively.

Sometimes, it can be tough to visualise the gap between sensor sizing purely by going over technical specs. The graphic below will offer you a more clear sense of the sensor sizes in the 645D and A300.

As you can tell, both the cameras provide different megapixels and different sensor sizing. The 645D having a bigger sensor will make getting shallower depth of field simpler and the Pentax 645D will offer more detail because of its extra 30 Megapixels. Higher resolution will also enable you to crop pictures more aggressively. The fresher 645D is going to have an edge with regard to sensor tech.