Guide number (ISO, in)Angle of coverage° horizontal and° vertical. In the table below you The light from the SB fill looks the same as the fill everyone else gets from the SB on camera) On an F there is no way to adjust the fill ratio with the SB Don't Missing: pdf View and Download Nikon SB instruction manual online. Here you can download all the user manuals (mainly the in-depth reference manuals) for Nikon's cameras in pdf format. No downloads are available for products that are not listed C