Well Well Well...
Hum, I just received my pictures from the test roll.
All pictures in exterior and sunlight and allright, including high speeds as 1/1000 and 1/2000.
But.... a big problem with Sync flash, as you can see below
This is the dark band problem, explained by a too slow curtain.
What I understand with this camera, is that :
- sync flash speed is 1/100
- dark band is due to 1rst curtain opening from bottom to top, the negative roll being of course inverted (upside-down).
- so dark band below is in fact due to lack of flash light (1/1000) during the uncomplete travel of 1rst curtain (still shadowing the top-level negative at mid-course).
- I checked curtain speed again from my testbench : about 10ms, that is is 1/100.
- The problem is that I have no idea of the time when flash lights : it's supposed at the end of 1rst curtain travelling, i.e. 10ms after start. If there is some dead time (needed to take acceleration from zero), this is NOT enough speed to be in time !
The dark band at 50% of height means that I need to recover...5ms in travel time !
So : I suppose I need to dismount again part of the camera to have access to those 2 spring set gears of the shutter, and add some turns (I had set to 1.4 turn to have about 11ms; at 2 turns preset I had found 8ms).
But I don't know how many turns are necessary at least...
If you have somme suggestions...