Originally posted by house Nice high iso performance!
A detail Pentax should steal from Fuji is the top lcd that shows current settings even when the camera is off. That should have been a Pentax innovations. Simple but super useful.
As far as I know a part of Nikon D810's top LCD is always on, cannot remember other makers. Anyway, it sounds like a useful feature with truly negligible impact on battery (see below).
Originally posted by biz-engineer LCD. Batteries get drained if not completely powered-off. I'm not seeing this in Pentax DSLR, I can leave it for two weeks in standby/sleep mode and battery is still charged.
Reflective LCD (the one which is readable even when there's no backlight) won't draw much current. Self-discharging of Li ion battery would be orders of magnitude worse.
Do you remember your digital wristwatch from yesteryear that would run on a teeny battery for years? Same deal here, though the technology improved. It's backlight that eats battery, not LCD.
For example, typical power consumption of this 2.7" 400x240 pixel RGB reflective LCD (each pixel comprises R, G and B dot) is
5 micro Watts when you just display a static pattern with backlight off. Of course it should depend on the pattern that's displayed, and in the worst case it's 105 micro Watts, but typically it's 5. And this display has many more LCD dots than Fuji's (this one has more pixels to start with, and this one is color, Fuji's is B/W).
https://www.j-display.com/product/pdf/Leaflet/3LL_2.7_rectagular_BL_LPM027M128C.pdf https://www.j-display.com/product/pdf/Datasheet/3LPM027M128C_specification_ver02.pdf
Now, even D-LI109 battery for my KP, which some complain as too small, is rated 7.4V 1050mAh i.e. about
7.8Wh. If I can magically use all of that energy to drive that 400x240 dot RGB LCD, it will typically run for 7.8Wh/(5 micro W)=1560000 hours =
178 years. Even in the worst case, it's 74286 hours or 8.5 years. Of course I cannot achieve that in reality for many reasons, for example the battery will lose its charge on its own in less than 178 years.