AGFA 307 - Manual (Page 49)

M MODE: Manual Exposure
In M mode, you have full control of the exposure. You select both the
shutter speed and the aperture. The data panel will tell you if the
exposure you have selected is over, under, or the same as the metered
exposure.
1. Set the command switch to ASM.
2. While pressing the mode button, turn the control dial until 'M'
blinks in the data panel.
The manual mode is selected when you release the mode button.
3. Turn the control dial to select the shutter speed.
4. While pressing the aperture button, turn the control dial to
select the aperture.