Panasonic G3 vs Pentax 645D

Below, we are contrasting the Panasonic G3 and Pentax 645D, one is a Entry-Level Mirrorless and the other is a Pro DSLR by manufacturers Panasonic and Pentax. There is a big difference between the sensor resolutions of the G3 (16MP) and 645D (40MP) and the G3 (Four Thirds) and 645D (Medium format) enjoy different sensor dimensions.

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The G3 was introduced 17 months after the 645D making the cameras a generation away from each other. The two cameras come with different body type with the Panasonic G3 being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before delving in to a comprehensive comparison, below is a short introduction of how the G3 grades vs the 645D with respect to portability, imaging, features and an overall mark.

Following is a sample of the gallery pics for Panasonic Lumix DMC-G3 and Pentax 645D. The whole galleries are viewable at Panasonic G3 Gallery and Pentax 645D Gallery.

When you are aiming to travel with your camera regularly, you're going to have to factor in its weight and volume. The Panasonic G3 has exterior dimensions of 115mm x 84mm x 47mm (4.5" x 3.3" x 1.9") with a weight of 336 grams (0.74 lbs) whilst the Pentax 645D has sizing of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs).

Analyze the Panasonic G3 and Pentax 645D in the all new Camera with Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will vary dependant on the lens you use during that time. Below is the front view size comparison of the G3 vs the 645D.

Considering size and weight, the portability grade of the G3 and 645D is 83 and 50 respectively.

In many cases, it is hard to picture the contrast between sensor dimensions purely by reviewing a spec sheet. The pic below will help give you a clearer sense of the sensor sizes in the G3 and 645D.

Clearly, both of the cameras posses different megapixel count and different sensor dimensions. The G3 having a tinier sensor is going to make getting shallower depth of field tougher and the Pentax 645D will deliver more detail using its extra 24 Megapixels. Greater resolution will also help you crop pics somewhat more aggressively. The newer G3 should have an advantage with regard to sensor innovation.