You don't actually need the focal length, it doesn't help accuracy that much but can help you line up the sky to the photo a bit quicker. Anyway, if we did, all

You don't actually need the focal length, it doesn't help accuracy that much but can help you line up the sky to the photo a bit quicker. Anyway, if we did, all that info was in the metadata anyway: Camera: Nikon D5 F-stop: f/2.8 Exposure time: 5 sec. Focal length: 28mm Max aperture: 3