Jar­gon buster

NPhoto - - Gear Zone -

Gn (Guide num­ber) This is a mea­sure­ment of flash power, quoted in me­tres or feet, usu­ally at ISO100. The max­i­mum dis­tance for a cor­rect ex­po­sure equates to the Gn di­vided by the aper­ture. For ex­am­ple, a rat­ing of Gn 24 would give a max­i­mum shoot­ing dis­tance of 3m at an aper­ture of f/8.

Wire­less connectivity

This goes be­yond a sim­ple op­ti­cal sen­sor for us­ing off-cam­era flash in man­ual mode, and in­cludes an in­frared link for TTL me­ter­ing com­mu­ni­ca­tion. Some flashguns add RF (Ra­dio Fre­quency) wire­less com­mu­ni­ca­tion.

Info screen

A rear screen is fit­ted to all the flashguns on test, apart from the Nikon SB-500. The Metz flashguns in­cor­po­rate touch-sen­si­tive screens for the ad­just­ment of set­tings.

On-board con­trols

You can typ­i­cally ap­ply changes to flash set­tings from menus in the host cam­era, but it’s of­ten quicker to use the con­trol panel on the flash­gun.

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