Originally posted by awaldram Pulling or pushing a sensor from it base ISO always gives lower DR (besides the K5 which strangely had a non linear iso 80 mode).
So if as suspected the K1 is native around iso 100 then offering a lower iso would only give reduced DR which I think we agree would be pointless.
If you need lower sensitivity for some shots then better to use a ND filter @iso100 and achieve Max DR the camera is capable of.
It is likely given the top ISO of this sensor that it will have the same or greater DR@iso100 than the D810@iso64
That would be quite an achievement, also in sensor development. The 2 year old Sony A7r, which may in fact have a sensor largely identical to the new K1, does not come near the maximum DR of the D810, mainly in the highlights it clips quite a bit more easily.
I would consider a native iso of 45-50 iso most beneficial for shooting in bright daylight, where the Sony A7r simply
has to be underexposed and lifted in post. Highlight reconstruction goes a long way in nowadays raw converters, but always affects the image where the D810 may require less highlight reconstruction or shadow/midtone lifting.
Chris
---------- Post added 02-18-16 at 02:06 PM ----------
Originally posted by Simen1 I don't think there is a native base ISO. Its not a hardware design, but rather a compromise done in cooperation between the sensor company and the camera company. Assuming K-1 uses the same sensor as D810, there is no hardware requirement that selected ISO 64 (measured 47) has to be enabled. They may very well just start from ISO 100, even if the sensor might withstand more saturation. The compromises are risk of overheating the entire sensor (more electrons captured in the wells and more electrons to move around the chip) and risk of single pixel or row failure in case the sun is in the frame (should be a large risk during the eclipse 21. august next year).
Oh yes there is absolutely a native lowest iso, and it is absolutely a hardware design. It comes down to how much photons the silicon wells can hold before they are saturated and clip. A larger Full Well Capacity is more expensive to produce as far as I know.
Chris