How to Eyeball the Distance of Manual Flash Using Inverse Square March 30, 2013April 12, 2016 by Bry Cox Bry Cox No comments yet Please Login to view this content. (Not a member? Join Today!) Post navigation Bry’s Lighting Crash Course – Foundation for Master LightingAdobe Lightroom 4.4 Update Available Now You do not have permission to view the comments. Click here to cancel reply.You must be logged in to post a comment.