When I use a flash on Manual mode, how do I calculate the needed F number, according to the guide number and object distance?
Hi, I really don't know what type of camera you are using. But the Army and Navy trained together using a Cannon AE-1. Here is a link to old manuals we used, but are still useful today when trying to find formulas for the aperture (the f-stop). I hope that you will find the manual as useful as we did. When we and the world began to use digital cameras, these manuals became obsolete.
http://www.tpub.com/content/photography/14209/css/14209_86.htm
Got an answer for a_fletch? Would you like to comment on the posted answers, or vote for the one which you think is the best?
Sign up for a free account, or sign in (if you're already a member).
Other people asked questions on similar topics, check out the answers they received: