Pentax 645D vs Sony TX66

On this page, we are evaluating the Pentax 645D versus Sony TX66, one is a Pro DSLR and the other is a Ultracompact by companies Pentax and Sony. There is a significant difference between the sensor resolutions of the 645D (40MP) and TX66 (18MP) and the 645D (Medium format) and TX66 (1/2.3") posses different sensor sizing.

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The 645D was brought out 24 months before the TX66 making them a generation away from each other. Both of the cameras have different body design with the Pentax 645D being a Large SLR camera and the Sony TX66 being a Ultracompact camera.

Before diving right into a step-by-step comparison, here is a short introduction of how the 645D matches up vs the TX66 in terms of portability, imaging, features and an overall mark.

This is a sample of the gallery pictures for Pentax 645D and Sony Cyber-shot DSC-TX66. The entire galleries are available at Pentax 645D Gallery and Sony TX66 Gallery.

For anyone who is aiming to travel with your camera, you'll have to consider its weight and size. The Pentax 645D has got exterior dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) whilst the Sony TX66 has specifications of 93mm x 54mm x 13mm (3.7" x 2.1" x 0.5") and a weight of 109 grams (0.24 lbs).

Contrast the Pentax 645D versus Sony TX66 in the all new Camera with Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will vary dependant on the lens you choose at that time. Following is a front view over all size comparison of the 645D versus the TX66.

Looking at size and weight, the portability grade of the 645D and TX66 is 50 and 97 respectively.

Usually, it can be difficult to visualize the difference between sensor dimensions simply by reading a spec sheet. The image below might give you a more clear sense of the sensor sizes in the 645D and TX66.

Clearly, each of the cameras provide different megapixels and different sensor dimensions. The 645D because of its larger sensor is going to make getting shallower DOF easier and the Pentax 645D will deliver more detail having its extra 22MP. Greater resolution can also help you crop photos more aggressively. The more aged 645D is going to be disadvantaged when it comes to sensor innovation.