Hi,
Recently, I´ve read something about OTF and Kodachrome films.
I think OTF word is sometimes confused. Everybody knows OM3Ti and
OM4Ti both uses OTF light metering and the unique difference between
them are mechanical and electronic shutter, but I think there´s a
big difference here.
I think, we must talk about OTF direct light metering and OTF
flash metering. When we use OM4Ti direct light metering, and we
meter the sun light (talking about kodachrome films) film reflectance
won´t affect to exposure because shutter curtain with the computer
calculated dots will measure the light after you´ve pressed the
shutter release and if something have changed (aperture priority
program) will let modify shutter speed (for example) from 240 to 312
this will be impossible with OM3Ti because there is no variable
shutter speed; there are only fixed shutter speeds.
When we use OTF flash, here film reflectance will take effect
at this time, and will affect to exposure. If the film reflects more
than 18%, photos will be underexposed and vice versa. Shutter control
will let to cut-off flash emision when there is a right exposure.
I would be very pleased if someone could help me with this stuff.
With all of this we can say that OM3Ti is much better camera than
OM4Ti with OTF flash, because you have from 1s to 1/2000s OTF flash
but with OM4Ti only from 1/60 to 1/2000s (normal and superFP).
On the other hand OM4Ti with aperture priority can use OTF with
normal photography and let you memory some exposure values with
AE-lock and with the shutter curtain modify "x" time in order to
achieve the old exposure.
Best regards,
Dave
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