Sigma SD15 vs Sony A7R IV

On this page, we are analyzing the Sigma SD15 and Sony A7R IV, one is a Advanced DSLR and the other is a Pro Mirrorless by companies Sigma and Sony. There is a crucial difference among the image resolutions of the SD15 (5MP) and A7R IV (61MP) and the SD15 (APS-C) and A7R IV (Full frame) provide totally different sensor size.

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The SD15 was revealed 10 years prior to the A7R IV which is a fairly serious gap as far as camera tech is concerned. Both cameras have different body design with the Sigma SD15 being a Mid-size SLR camera and the Sony A7R IV being a SLR-style mirrorless camera.

Before delving right into a detailed comparison, here is a simple view of how the SD15 grades versus the A7R IV in terms of portability, imaging, features and an overall score.

This is a sample of the gallery pics for Sigma SD15 and Sony Alpha A7R IV. The full galleries are viewable at Sigma SD15 Gallery and Sony A7R IV Gallery.

For those who are intending to carry around your camera frequently, you will have to factor its weight and volume. The Sigma SD15 features outer dimensions of 144mm x 107mm x 81mm (5.7" x 4.2" x 3.2") along with a weight of 750 grams (1.65 lbs) and the Sony A7R IV has sizing of 129mm x 96mm x 78mm (5.1" x 3.8" x 3.1") along with a weight of 665 grams (1.47 lbs).

Look at the Sigma SD15 and Sony A7R IV in the latest Camera and Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will change depending on the lens you are utilising at that time. Below is a front view sizing comparison of the SD15 and the A7R IV.

Factoring in size and weight, the portability rating of the SD15 and A7R IV is 59 and 62 respectively.

Generally, its hard to envision the contrast in sensor sizes merely by checking out specs. The pic below will help give you a more clear sense of the sensor dimensions in the SD15 and A7R IV.

All in all, both cameras have different megapixel count and different sensor sizes. The SD15 using its smaller sensor will make getting shallower DOF tougher and the Sony A7R IV will show more detail because of its extra 56 Megapixels. Greater resolution will let you crop pics a bit more aggressively. The more aged SD15 will be disadvantaged with regard to sensor innovation.