Pentax RZ18 vs Sony A58

In this write-up, we will be analyzing the Pentax RZ18 and Sony A58, one is a Small Sensor Superzoom and the latter is a Entry-Level DSLR by companies Pentax and Sony. The sensor resolution of the RZ18 (16MP) and the A58 (20MP) is relatively similar but the RZ18 (1/2.3") and A58 (APS-C) feature different sensor sizes.

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The RZ18 was launched 3 years prior to the A58 which is quite a big gap as far as technology is concerned. The two cameras offer different body type with the Pentax RZ18 being a Compact camera and the Sony A58 being a Compact SLR camera.

Before getting in to a step-by-step comparison, below is a quick introduction of how the RZ18 matches up versus the A58 when it comes to portability, imaging, features and an overall mark.

Below is a preview of the gallery photos for Pentax Optio RZ18 and Sony SLT-A58. The complete galleries are provided at Pentax RZ18 Gallery and Sony A58 Gallery.

For anyone who is intending to travel with your camera often, you'll need to consider its weight and volume. The Pentax RZ18 has got external measurements of 97mm x 61mm x 33mm (3.8" x 2.4" x 1.3") and a weight of 178 grams (0.39 lbs) whilst the Sony A58 has sizing of 129mm x 95mm x 78mm (5.1" x 3.7" x 3.1") having a weight of 492 grams (1.08 lbs).

Compare the Pentax RZ18 and Sony A58 in the all new Camera with Lens Size Comparison Tool.

Take into consideration, the weight of an Interchangeable Lens Camera will vary based on the lens you are working with at the time. Following is the front view scale comparison of the RZ18 compared to the A58.

Taking into account dimensions and weight, the portability grade of the RZ18 and A58 is 92 and 68 respectively.

Quite often, it's difficult to visualize the gap between sensor dimensions only by reviewing specifications. The picture underneath should give you a far better sense of the sensor measurements in the RZ18 and A58.

To sum up, both of these cameras enjoy different resolutions and different sensor dimensions. The RZ18 due to its tinier sensor is going to make shooting shallower DOF harder and the Sony A58 will offer greater detail utilizing its extra 4MP. Higher resolution will make it easier to crop photographs far more aggressively. The more aged RZ18 is going to be disadvantaged when it comes to sensor innovation.