I try to do something but this is not a thing for pixelpost, in spite of that, I thought you could maybe help me.
I have done a website
in order to display exif of pictures hosted on internet.
Now I would like to calculte focal range of the lens used to take a picture. I know it can be done, flickr does it, but I don't know how to do it.
This is a exemple of the data
I can use to calculate it.
I will be extremely grateful if you can help me.