Quick Q, would the MB file size of an image be a good way to compare different lenses resolving power of the same image?
I may be reading this wrong. But my understanding is that the file size is going to be roughly the same coming from the same camera. It will depend a little from image to image. When I look at the files from one camera, there is a little variation in file sizes. I guess the way that light, dark, and colours are recorded would be the reason. Someone please feel free to correct me with that. Gary
Generally the files don't change size for example my 5d2 puts out about 25-30mb raws, and the 5d4 is more around 40 give or take a few megabytes. There is some variation, likely more to do with ISO used and other such settings that cause fluctuation. Of course JPG is going to be more variable because it is processing the image and then compressing it in camera. again we are talking megabytes, for example depending on the image it may be between 5 and 10 mb jpg similar mb difference but a much large % difference file to file. So in short No, it is not a good way to compare file size, it has much more to do with the the dynamic range of light in the scene and can fluctuate from low to high end of its mb range easily regardless of lens. MTF charts are a good way to see resolving power.
