Pentax 645Z vs Sony A33

On this page, we are evaluating the Pentax 645Z versus Sony A33, one is a Pro DSLR and the other is a Entry-Level DSLR by manufacturers Pentax and Sony. There is a crucial difference among the sensor resolutions of the 645Z (51MP) and A33 (14MP) and the 645Z (Medium format) and A33 (APS-C) provide totally different sensor size.

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The 645Z was revealed 3 years after the A33 which is a fairly serious gap as far as camera tech is concerned. Both the cameras have different body design with the Pentax 645Z being a Large SLR camera and the Sony A33 being a Compact SLR camera.

Before going right into a more detailed comparison, here is a concise overview of how the 645Z scores vs the A33 with regards to portability, imaging, features and an overall mark.

Following is a sample of the gallery pictures for Pentax 645Z and Sony SLT-A33. The full galleries are provided at Pentax 645Z Gallery and Sony A33 Gallery.

For anybody who is aiming to travel with your camera often, you will need to consider its weight and proportions. The Pentax 645Z has got exterior dimensions of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") with a weight of 1550 grams (3.42 lbs) whilst the Sony A33 has measurements of 124mm x 92mm x 85mm (4.9" x 3.6" x 3.3") along with a weight of 500 grams (1.10 lbs).

Look at the Pentax 645Z versus Sony A33 in the new Camera and Lens Size Comparison Tool.

Take into consideration, the weight of an Interchangeable Lens Camera will vary dependant on the lens you have during that time. Here is a front view scale comparison of the 645Z vs the A33.

Using size and weight, the portability score of the 645Z and A33 is 49 and 67 respectively.

Oftentimes, it's hard to visualise the contrast in sensor dimensions only by seeing specs. The image underneath may offer you a greater sense of the sensor sizes in the 645Z and A33.

All in all, each of the cameras provide different megapixels and different sensor dimensions. The 645Z having a larger sensor will make shooting shallower depth of field easier and the Pentax 645Z will produce more detail because of its extra 37 Megapixels. Greater resolution will also let you crop pics more aggressively. The more recent 645Z is going to have a benefit with regard to sensor technology.