Ricoh / Pentax GR IV firmware v1.11

The electronic shutter function introduced in the GR IV HDF has been added to the GR IV.

Shooting is poss​ible at F2.8 (wide open) with shutter speeds of up to 1/16000 seconds.

Even in bright environments, proper exposure can be achieved when shooting near the aperture’s wide-open setting.

When the aperture is set between F2.8 and F4.0, the mechanical lens shutter is used at shutter speeds of 1/2500 seconds or slower, and the electronic shutter is used at speeds from 1/3200 to 1/16000 seconds.

When the aperture is set between F4.5 and F5.0, shutter speeds of 1/3200 seconds or slower use the mechanical lens shutter, while speeds from 1/4000 to 1/16000 seconds use the electronic shutter.

When the aperture is set between F5.6 and F16, shutter ​speeds of 1/4000 seconds or slower use the mechanical lens shutter, while speeds from 1/5000 to 1/16000 seconds use the electronic shutter.

When using the electronic shutter, a “rolling shutter effect” may occur, causing fast moving subjects—such as trains, cars, or sports scenes—to appear slanted or to be recorded with circular distortion.

Improved stability for general performance.

Applying this update to the GR IV will also include all features and changes introduced in version 1.04 and earlier.

Once this update is applied, it is not possible to revert to a previous firmware version.