I am beginner to photography, and I've learnt that we can do a lot of post-production in images by using RAW format. I'm looking for options to change/modify the depth of field in the RAW images - is this possible?
Answer
No - the aperture is set by the physical blades in the lens when you take the photo; a RAW "image" contains the readings from the sensor when the photo was taken, so there's no way you can go back and modify the light which was captured by the sensor. While it's not as obvious, this is equivalent to asking "Can I modify what the camera was pointing at from a RAW image?"
The closest that we have at this point in time is a Light-field camera which does allow you to modify things like the depth of field and the focal plane after the shot has been taken.
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