Custom firmwareControls
Rear dial sets ISO
Turn the rear dial (the ring around the four-way controller) to change ISO directly while shooting, without pressing the ISO key first; below the lowest ISO is AUTO.
- Turn the rear dial to set ISO, no ISO key needed
- Below the lowest ISO is AUTO
- The front dial and the ISO key work as before
After flashing, switch it on on the Features page of GRLife Pro in the camera.
What it does
- One click, one step (1/3 EV by default): AUTO → 100 → 125 → … → 102400, stopping at the top
- Below the lowest ISO is AUTO; up from AUTO goes back to the lowest ISO
- The front dial still sets aperture and shutter speed; the ISO key works as before
How to use it in the camera
- Switch it on on the Features page of GRLife Pro.
- Once it is on, turning the rear dial while shooting sets ISO.
Requirements and limits
- In M the stock rear dial sets exposure compensation and in bulb timer the time; with this feature it sets ISO there too. B and T have no AUTO, so it stops at the lowest ISO. In Snap Distance Priority the rear dial still sets the depth of field as stock, and in menus, playback and movie mode it works as stock too.
- Nothing is written to the settings: switch it off, or flash back to the official firmware, and the rear dial works as before.
Testing status
Verified on a GR IIIx 1.70; still keep the stock firmware to flash back.
FAQ
Can I turn it off in the camera?
Yes. Switch off “Rear dial ISO” on the Features page of GRLife Pro.
Does the rear dial still set exposure compensation in M mode?
No. With this feature, the rear dial sets ISO in M mode instead.
Does the rear dial change in menus and playback?
No. In menus, playback and movie mode the rear dial is unchanged.
What happens after flashing back to the stock firmware?
Nothing is written to the settings, and after flashing back to the official firmware the rear dial works as before.
Custom firmware, test version · The result is unofficial firmware and flashing carries risk; back up first and keep the official firmware.
Other features
- GRLife ProSwap films from the SD card in the camera, with grain, diffusion and an imprint (date and caption).
- HDR photosEach JPEG carries an HDR gain map, so highlights look brighter and more detailed on HDR screens.
- Live photosWith every photo, the camera also saves a short silent clip from just before and after the shutter; once exported, it is a photo that moves in your phone’s library.
- Recipes (parameters)Preset nine parameters on the stock image controls; the stock looks stay, and one or two slots is fine.
- More aspect ratiosAdds five aspect ratios: 7:6, 5:4, 4:3, 16:9 and full-width 65:24.
- Half frameTwo portrait shots become one 3:2 photo with a black line between them, just like a half-frame film camera.
- Golden ratio guidesAdds a golden ratio grid and golden spirals in four directions to the camera’s own grid style menu.
- Rail levelThe level becomes two rails; the camera is level when the dot sits in the ring and turns green.
- Anamorphic lensWith a 1.25× or 1.20× anamorphic widescreen lens mounted, live view and photos are desqueezed in the camera into a wide frame with normal proportions.
- Nine ADJ settingsADJ Mode Setting grows from 5 to 9 settings, and the ADJ strip shows them all at once.
- Snap distance in feetThe snap focus distance reads in feet: in the menus, on the shooting screen and in ADJ, 2.5m shows as 8ft.