Pentax 645D vs Sony NEX-3

Lets look a bit more closely at the Pentax 645D versus Sony NEX-3, former is a Pro DSLR while the latter is a Entry-Level Mirrorless by brands Pentax and Sony. There is a sizable difference between the resolutions of the 645D (40MP) and NEX-3 (14MP) and the 645D (Medium format) and NEX-3 (APS-C) feature different sensor sizes.

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The 645D was unveiled 2 months earlier than the NEX-3 so they are of a similar age. Both of these cameras come with different body type with the Pentax 645D being a Large SLR camera and the Sony NEX-3 being a Rangefinder-style mirrorless camera.

Before delving in to a in-depth comparison, below is a simple summation of how the 645D scores vs the NEX-3 in relation to portability, imaging, features and an overall score.

The following is a preview of the gallery images for Pentax 645D & Sony Alpha NEX-3. The full galleries are provided at Pentax 645D Gallery & Sony NEX-3 Gallery.

If you are aiming to carry around your camera, you have to factor in its weight and measurements. The Pentax 645D has got external 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) whilst the Sony NEX-3 has proportions of 117mm x 62mm x 33mm (4.6" x 2.4" x 1.3") along with a weight of 297 grams (0.65 lbs).

Check the Pentax 645D versus Sony NEX-3 in our brand new Camera plus Lens Size Comparison Tool.

Do not forget, the weight of an ILC will differ based on the lens you have during that time. Below is the front view over all size comparison of the 645D against the NEX-3.

Taking into account size and weight, the portability rating of the 645D and NEX-3 is 50 and 89 respectively.

Generally, it is hard to imagine the difference between sensor sizes just by reviewing a spec sheet. The image here will offer you a stronger sense of the sensor measurements in the 645D and NEX-3.

Clearly, both the cameras posses different megapixel count and different sensor sizes. The 645D using its bigger sensor is going to make achieving shallow DOF easier and the Pentax 645D will offer more detail having an extra 26 Megapixels. Higher resolution will also allow you to crop shots somewhat more aggressively.