Originally posted by Hornet Well it's been about a year since I started this thread and I promised I'd give an update. I bought the K10D and after a bit of playing around with the menu settings for flash my setup worked. I didn't really make an effort to determine exactly what the key setting was - I just made sure I didn't change anything in the menus. Since then I've been using the onboard flash to trigger a small manual flash mounted on a macro flash bracket (John Shaw design) optically/wirelessly. The onboard flash actually helps to provide some background lighting around my subjects - eliminating some of the super-black backgrounds common in flashlit macro shots. I also found that using a small piece of exposed film to cover the onboard flash can eliminate the onboard as a light source but it will still trigger the remote flash. The biggest problem I encountered with this setup was that the optical trigger hotshoe has the sensor on the front (more or less hidden from the onboard flash in my setup). This was solved by modifying the optical hotshoe so that the flash mounts opposite to the original direction.
Now I've got a K20D and in testing my macro rig I found that none of my shots were getting exposed even though the flash was firing optically. After fiddling around for a bit I discovered that I had the lens set on "A" which I normally don't do. Apparently, as someone else mentioned in this thread, the flash doesn't fire synchonously in this lens mode - does this make any sense? I already don't like the missing apreature ring on DA lenses but this pretty much seals it for me - at least in terms of macrophotography I have to have the ability to use a aperature ring. While I'm on this - why doesn't the camera record the aperature of an A lens when it is set on a discrete f-stop? The light meter seems to know what f-stop is set otherwise the exposures would always be wrong!?
I would like to hear other's opinions ...
Couple answers (I hope). The camera has no real communication w/ the lens when you take the "a" off "A".. It has no idea what aperture you set it to. As to exposure, it meters off whatever aperture you have it set to.
I also assume on "A" the flash defaults to p-TTL w/ pre-flash. Off "A" p-ttl flash is probably off and you just get straight manual flash.