Pentax 645D vs Sony A900

Following is a detailed review of the Pentax 645D versus Sony A900, former is a Pro DSLR while the latter is a Advanced DSLR by companies Pentax and Sony. There exists a substantial gap among the sensor resolutions of the 645D (40MP) and A900 (25MP) and the 645D (Medium format) and A900 (Full frame) boast different sensor size.

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The 645D was manufactured 17 months after the A900 which makes them a generation away from one another. Both of the cameras feature different body design with the Pentax 645D being a Large SLR camera and the Sony A900 being a Mid-size SLR camera.

Before diving right into a full comparison, here is a concise view of how the 645D scores versus the A900 with regards to portability, imaging, features and an overall score.

Below is a preview of the gallery photos for Pentax 645D & Sony Alpha DSLR-A900. The entire galleries are viewable at Pentax 645D Gallery & Sony A900 Gallery.

For anyone who is aiming to carry around your camera, you are going to need to factor its weight and dimensions. The Pentax 645D features outer measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs) while the Sony A900 has dimensions of 156mm x 117mm x 82mm (6.1" x 4.6" x 3.2") along with a weight of 895 grams (1.97 lbs).

Check out the Pentax 645D versus Sony A900 in our completely new Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will vary dependant on the lens you are utilising during that time. Underneath is a front view overall size comparison of the 645D vs the A900.

Considering dimensions and weight, the portability score of the 645D and A900 is 50 and 54 respectively.

Typically, it is hard to imagine the gap in sensor sizes only by seeing a spec sheet. The picture here will help offer you a clearer sense of the sensor measurements in the 645D and A900.

As you can see, both of those cameras feature different resolutions and different sensor sizes. The 645D because of its bigger sensor is going to make shooting shallow depth of field simpler and the Pentax 645D will produce more detail due to its extra 15 Megapixels. Higher resolution can also let you crop pictures way more aggressively. The newer 645D provides a benefit when it comes to sensor tech.