Hi, Coutts,
Something just come into my mind, but
probably you'd hv know it.
5D & 400D are using the same processor, Digi II,
there were cracked firmwares that enabled a 400D to
use 1/3 ISO settings, ie. 125, 160, 250, 320 . . . . and
extended beyond 400D original ceiling ISO 1600 to ISO 2000, 2500 and 3200
and
some other functions (which I forgot)
See if these kind of source can safe you some time.
Cheers
Something just come into my mind, but
probably you'd hv know it.
5D & 400D are using the same processor, Digi II,
there were cracked firmwares that enabled a 400D to
use 1/3 ISO settings, ie. 125, 160, 250, 320 . . . . and
extended beyond 400D original ceiling ISO 1600 to ISO 2000, 2500 and 3200
and
some other functions (which I forgot)
See if these kind of source can safe you some time.
Cheers