Hallo all! I have two flash units. I want to use both the flashes simultaneously for frontal lighting, sidelighting and back lighting macro shots of flowers etc. I have a synchronization cord, eye and cord extensions (2 m) to fire the flashes simultaneously. The problem is automodes of the flash won't help me while doing macro macrophotography because the f/stop-film speed-distance chart at the back of the flash is made on the assumption that the source is a point source (Am I right?). When the flash is near (1 m) to the subject, it is no more a point source but an extended source. The only way that I can control the light is by adjusting the separation between the subject (flower) and the flash or adjusting the output levels of the flash. Has anybody got some experience in using twin non-TTL flash for macro? I can not understand what aperture shall I set. Do I have to calculate Bruhlich factor and prepare the nomograms? If yes, it becomes tedious.
The other thing that is not clear to me, is using the non-TTL flash as a fill flash for macro shots. Is it possible to use the automodes here? Or shall I adjust the output level? If the second is true, what aperture shall I choose for a particular distance (1-1.5 m) for so and so guide number. I use Vivitar 2800 (G.N. 22 m) and Vivitar 285HV (G.N. 36 m at Normal setting of the zoom head). Thanks for reading. With regards, Ayash. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
