Pentax 645D vs Sony TX20

Let's look a bit more closely at the Pentax 645D versus Sony TX20, one being a Pro DSLR and the latter is a Ultracompact by companies Pentax and Sony. There is a huge difference between the image resolutions of the 645D (40MP) and TX20 (16MP) and the 645D (Medium format) and TX20 (1/2.3") use totally different sensor sizes.

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The 645D was manufactured 24 months before the TX20 which makes the cameras a generation apart from each other. Each of the cameras offer different body type with the Pentax 645D being a Large SLR camera and the Sony TX20 being a Ultracompact camera.

Before delving through a detailed comparison, below is a simple overview of how the 645D scores against the TX20 in terms of portability, imaging, features and an overall rating.

Below is a preview of the gallery images for Pentax 645D and Sony Cyber-shot DSC-TX20. The entire galleries are viewable at Pentax 645D Gallery and Sony TX20 Gallery.

For anybody who is planning to carry your camera frequently, you are going to need to consider its weight and dimensions. The Pentax 645D has got outer dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs) while the Sony TX20 has dimensions of 96mm x 56mm x 18mm (3.8" x 2.2" x 0.7") with a weight of 133 grams (0.29 lbs).

Contrast the Pentax 645D versus Sony TX20 in the latest Camera with Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will vary based on the lens you have attached during that time. Below is the front view sizing comparison of the 645D compared to the TX20.

Taking into account size and weight, the portability grade of the 645D and TX20 is 50 and 96 respectively.

In many cases, it is very difficult to visualise the difference between sensor sizing only by going over specifications. The graphic underneath should offer you a much better sense of the sensor sizes in the 645D and TX20.

Plainly, the 2 cameras offer different megapixels and different sensor sizing. The 645D featuring a bigger sensor will make achieving shallow depth of field easier and the Pentax 645D will deliver greater detail due to its extra 24MP. Higher resolution will also make it easier to crop pictures a little more aggressively. The older 645D is going to be behind when it comes to sensor innovation.