I am thinking of getting an accessory fill flash for my Canon EOS 35 mm, and wou ld like also to be able to use it on my field camera for a fill light in certain landscape situations, such as shooting, for instance, backlighted wildflowers i n the foreground of a landscape. First, what features and attachments are requi red to be able to sync the flash up with large format lenses? Second, what feat ures would be nice to have to make it easy and practical to use a fill flash for this purpose and to calculate exposures. For instance, assuming that I want th e fill flash to illuminate foreground objects to approximately zone 4 (1 stop un der medium gray), is this easy to control? What would make it easy to control?