there was not any Warning about using new Flash on old Camera´s, but some old Flashes could
be dangerous for new Body´s .
An A1 shoult work in Manual Mode and in EXT-M Mode from the 600RT´s - and also should work with
the ST-E3-RT - but Flash Ready, Auto X-Sync-Switch and setting of the Appature automatically will
not work - i assume.
Update "onthefly" - looks not so good:
Installed the ST-E3-RT on my T90 - The Camera switched to 90sec. X-Sync ( 250 original max ) - shows
the Flashready Symbol, but does not fire the Flash via Radiolink.
Also tested teh 600-EX-RT direct on the T90 - the Flash switched to TTL ! and it seems to work with
controlled Power from the T90 .
Ok, i´ve got an 300TL for the T90 - i am only playing - but i am wondered why the ST-E3-RT does not trigger
on the T90 ?
Thank you Bernd. You give me faith. I guess that I will try to put on first the 600 on top of it and see if it works. I was a bit worried that something might happen that causes either of them to fail/or be broken. If it simply does not work, that is the least of worries