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3.2 Full frame or medium format selection (35mm mode on/off)
F mount lenses are designed for full frame cameras. Its image circle covers a 36mm x 24mm
sensor. But the dimension of the sensor of GFX cameras is about 44mm x 33mm. Thus, many F lenses
can’t fully cover it at all and may cause dark corners/vignetting and distortion, etc. It’s normal and not
the malfunction of the adapter.
By default, the camera menu item “35mm mode” is set to “auto”. Images will be cropped to
36x24mm automatically when an adapter is attached. (Be noted, it won’t do that auto crop if focus
bracketing support or in
-
body vignetting and distortion correction for current lens is enabled in
SETTINGS.INI on the adapter. Check section 3.7.1 and 3.7.4 for more details.) Thus, usually you won’t
see the issues mentioned above. But, since some of the F mount lenses do cover the medium format
sensor, you may force the camera to capture 44x33mm images by setting “35mm mode” to “off” on
camera menu.
3.3 Setting aperture and shutter speed value
Setting aperture value through command dial on the camera:
You may use camera’s command dial to set aperture value. Please refer to the camera’s manual for
more details. Be noted that the front dial of some GFX cameras may be shared by ISO and aperture
settings. On those camera models, you may need to press the front dial before setting the aperture
value if it is in the ISO setting mode.
For Nikon AF/AF
-
D lenses, please set aperture ring on the lens to the minimum position
(maximum F number). Or the lever inside the lens may interfere with that of the adapter when
controlling diaphragm.
Manually setting shutter speed is suggested!
If you set shutter speed to auto, when
environment brightness changes during view finding, the lens aperture blades may move frequently
with a little noise and slightly flashing of LCD or EVF. Native GF lenses behave the same. But their
aperture motor moves so fast and silently that you will never notice. However, F mount lenses’
aperture motor moves slower and noisier. If you want to avoid it, please manually set shutter speed.
You may still set shutter speed to auto if that’s tolerable. Be noted that if “PREVIEW EXP./WB IN
MANUAL MODE” on the camera menu is set to “OFF”, the described issue may occur even the shutter
speed is set manually.
Regarding AF/D/G lenses from Nikon and other non
-
electromagnetic auto lenses from third
parties, there is a mechanical coupling between the lens and the adapter which may bring aperture
control tolerance inevitably. When the camera is metering, if the shutter speed is set to auto, e.g.,
aperture priority mode, it may use a different aperture from your setting. That may cause metering
