"How can the OM-3Ti work with OTF in manual mode (mechanical shutter)?"
Suppose, like the OM-2, it reads the light reflected from the shutter
curtain? (Does it? I don't know for sure.)
"How can my OM-3Ti meter the flash light coming from the F280 in manual
mode, because there is no thyristor sensor?"
The same sensor could read the light reflected from the film during the
flash, and send the cutoff signal to the flash. (The thyristor is in the
flash, not the camera.) This is no different from switching an automatic
camera to manual and letting the flash unit calculate the exposure.
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