Rea l world meets lab

We looked for the dis­tance each flash could cover, as well as how smartly it per­formed

NPhoto - - Gear Zone -

■ All func­tions, fea­tures and fir­ing modes of the flash­guns were tested. To check out­put power, each flash­gun was fired at each set­ting through­out its en­tire range of man­ual set­tings. This was re­peated at zoom set­tings of 24mm, 50mm and 105mm (FX), where avail­able. A flash me­ter was used at a dis­tance of one me­tre, and the re­sult­ing light read­ings were then con­verted to give a Gn num­ber at ISO100, mea­sured in me­tres.

We also checked for flash ex­po­sure ac­cu­racy, us­ing TTL rather than TTL-BL (Bal­anced fill-flash) mode. For this, we pho­tographed a neu­tral grey card, which should pro­duce a spike at the cen­tre of the his­togram, and then cal­cu­lated the amount of over- or un­der-ex­po­sure in +/-EV (Ex­po­sure Value) steps. Fi­nally, we mea­sured the re­cy­cle speed af­ter a full-power flash, us­ing both al­ka­line and NiMH bat­ter­ies.

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.