NPhoto - - Test Team -

All func­tions, fea­tures and fir­ing modes were tested. To check the ac­tual ver­sus the claimed power, each flash­gun was set to full-power man­ual flash, with a zoom set­ting of 105mm (FX). A flash light me­ter was used at a dis­tance of two me­tres, and re­sult­ing read­ings were con­verted to give a guide num­ber (Gn) at ISO100, mea­sured in me­tres. We mea­sured power out­put through­out the man­ual power range for each flash­gun.

We tested each flash­gun un­der the same con­di­tions in or­der to make a fair com­par­i­son

Additional tests in­cluded check­ing for colour ac­cu­racy. A colour test chart was shot purely un­der flash il­lu­mi­na­tion, us­ing the cam­era’s Flash White Bal­ance set­ting. For TTL flash ex­po­sure ac­cu­racy, we pho­tographed a neu­tral grey card, which would pro­duce a spike at the cen­tre of the his­togram dis­play, and then we cal­cu­lated the amount of over­ex­po­sure or un­der­ex­po­sure in +/-EV (Ex­po­sure Value) stops.

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