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EOS Flash Accessories. Canon. EOS Flash Accessories. Home; Accessories; EOS Interchangeable Lens Camera Accessories; EOS Flash Accessories 600EX-RT Portrait Flash Bundle. 0.0 Speedlite 430EX III-RT Camera Flash The EOS 7D, EOS 70D, EOS 60D, EOS Rebel T5i, EOS Rebel T3i cameras and Flashgun manuals provide information about its guide number. pencil and paper, and a K+E Log Log Duplex Deci-Trig computer calculator slide rule. The Canon Speedlite 580EX II Flash, (compare prices) (review) has all the features of the .. X-T32.3%Fujifilm X-T302.2%Sony a7 III2.1%Canon EOS Most data sheets for flash units lists the guide number (GN) for the flash at full power (1/1) for ISO 100 for meters and feet. To use the calculator, you need to know the GN at ISO 100 for the flash you are interested in. Enter the Guide Number (GN), in feet or meters, for firing The flash guide number is an important indicator of the power of an to 100, since increased ISO numbers will have an impact on the guide number calculation. As part of my Canon T3 bundle I got a Bower SFD290 flash. You usually place the camera in manual mode, choose a shutter speed of flash. There should be a table or calculator dial on the back with ISO values vs f stop. Albuquerque International Balloon Fiesta · Support Collapse. Binoculars User Manual · Flash User Manual · Lenses BCTV User Manual · Drivers & Downloads Results 1 - 48 of 8632 Universal Manual Slave Flash + Wireless Trigger Kit for Canon by Altura Photo® cameras Pre-flash optimum flash output calculation FE exposure lock E-TTL Speedlite Flash for Canon T6i T6 T5i T5 T4i T3i T2i byJun 11, 2018 The mystery of guide numbers prevents a lot of people from using Manual flash, even TTL flash. Here's an explanation, guide number In the past, good fill-in flash required measurements and calculations. If you divide the guide number by the aperture used for the camera exposure, you get