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Flash Guide Numbers on Flash Units ; 100. 39*. 10 ; 200. 56*. 14 ; 400. 79. 20 ; 800. 112. 28. Buy any Nikon flash (Speedlight) made in the last 15 years with a TTL setting and it will work perfectly with any modern or old Nikon film camera. The only realGuide Number is the specification of the flashes power capability for a given situation, like for each speedlight zoom setting. The purpose and advantage of Your essential guide to Nikon on-camera flash · 1. Don't get too close to your subject, as the pop-up flash has a guide number of around 12m. · 2. Use P (program Using the guide number, it is easy to calculate the how close the subject should be at a given aperture or the aperture required to photograph a subject at a