SD0 is part of a group of extensions known as Dali Raw images, together with SD1 and SD2. Each of these formats represents RAW images captured using a Sigma device. Also known as "digital negatives", photos shot in RAW mode capture the image exactly as seen by the lens, without any automatic retouching or balancing of colors, lights etc.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple SD0 files as once.
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