I do not know what the GNs for all ISOs are, nor do I really understand how to figure it out. What I do know is that if your lead photographer is "setting his flash to f8" he is ~not~ going full manual. It sounds as if he is using an automatic flash whereby he sets his desired output in fstops on the flash and a sensor on the flash tells itself to quench when the "proper" amount of light has reached the subject. And I also know that it is not because of the TTL that your backgrounds came out underexposed. When the light level drops beyond some certain level, the camera will start choosing shutter/aperature combinations based solely on giving you a sharp handheld flash illuminated photograph. If you use your camera in program mode in low light you will get dark backgrounds. The rememdy is not to burden yourself by trying to memorize a thousand numbers and try to perform calculations while shooting an event as important as a wedding. God I can hardly stand the stress of a wedding as it is... :P The solution, if you insist that you must have more exposed background, is to set your ~camera~ to manual and try to set it to properly expose for the ambient light. Then you can set your flash to TTL and bang away and you will have good backgrounds and flash illuminated subjects.
Nick Wright --- Glen O'Neal <[EMAIL PROTECTED]> wrote: > My lead photographer was working with me this > weekend at a wedding. I was > shooting TTL. He likes to go full manual and get the > exposure with a meter > for ambient light then set his flash one stop down > from that reading for > fill and shoot. He told me, "set your flash on f/8". > I am looking at the > flash unit and the book. I have 1/1 power, 1/2, 1/4, > 1/8, 1/16, 1/32. I have > no idea how to set it to a specific f/stop. The > owner's manual only has a > table of guide numbers for 100 and 400 speed film. I > know that every other > stop (i.e. 1600, 6400, etc.) doubles the guide > number. Is there a chart or > calculation whereby I can figure out the GN for any > speed film. This is > basically what I am trying accomplish with the guide > number chart. Any help > anyone can give would be very much appreciated. By > the way, using the TTL > with the new 645n produced some very pleasing > images, but he is right, the > background could have not been so dark. > > Thanks, > Glen (in Kansas City) > - > 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 . HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - 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 .
