See my Pentax K wish list at B&H Photo.
See my in-depth review of the Pentax K1.
A key disappointment with the Pentax K1 when I reviewed it back in June was the lack of an EFC shutter, which causes loss of sharpness with telephoto lenses.
While the K1 always has utilized an EFC shutter in SuperRes pixel shift mode, that was the only case in which it did so, which was a bizarre and ill-considered design choice given the potential for loss of sharpness with telephoto lenses.
The 2016-09-20 Ricoh Imaging (Pentax) press release states that EFC shutter for single exposures will become available soon via a firmware update.
Release of the function expand Firmware version 1.30 for PENTAX K-1
RICOH IMAGING COMPANY, LTD. is pleased to announce the release of the function expanding Firmware version 1.30 for PENTAX K-1 digital SLR camera (launched on April, 2016) on September 29, 2016.
The function expand firmware is to add new function or increase number of setting for currently used PENTAX K-1 camera, so that improve the function, easy handling and update to the latest function.
You can download the free function expand firmware at the official website.
Enhanced functions （PENTAX K-1 V1.30）
Release date : September 29, 2016
*The Electronic Shutter at Live View mode
The Electronic Shutter can be selected at the Menu to reduce camera shake from the mechanical shutter when shooting with Live View mode.
*Add the [1:1] format at the Crop mode
Added and selectable [Square format (1:1)] size at the Crop mode.
*Add [2 frames bracketing] for the [AA Filter Simulator bracketing]
Addition to the current [3 frames bracketing (OFF, TYPE1, TYPE2)], the [2 frames bracketing (OFF, TYPE2)] is added and selectable for the [AA Filter Simulator bracketing]
At the [BKT] setting, the bracketing range [±0 (=single frame)] can be selected.
*Improved stability for general performance.