Originally posted by oldstoat surely pointing the camera at a light would have made the iso lower ie down towards 50 etc
No, not necessarily. Auto-ISO is independent of the program line and for some configurations may take a fair amount of effort to coerce up or down. Configuration is done using capture menu (camera icon) 2/ISO AUTO Setting. The choices (slow, standard, and fast) are detailed on p39 of the user manual.
The rub is that two of those three words do not mean what you think they mean.Slow has nothing to do with ISO speed, shutter speed, or program lines. What it means is that the ISO will change only when there is no other way to get correct exposure Standard (default) is Ricoh's best guess as to how auto-ISO should work. I strongly suggest leaving it on this setting unless you have a specific use case. Fast has nothing to do with ISO speed, shutter speed, or Hi-speed priority program line. What it means is that the ISO will change more readily than if set to Standard.
Edit: The three points above reflect conventional wisdom from other discussions on the subject over several years, but are not consistently true (not true at all?) on the K-3. I did some additional look-see and am having to adjust my thinking.
I will admit to not being a huge fan of auto-ISO,* though I do use it on occasion, but never when I want to have fine control. My personal rules:
- Generally use fixed ISO
- If one wants ISO to float while controlling aperture and shutter, use TAv mode
- Use auto-ISO when light is expected to be variable and when it is inconvenient to have to think about it
- Set the auto-ISO limits to reasonable numbers that reflect quality expectations and style of shooting. Edit: This is particularly important in Tv and Av modes.
I almost added "Avoid using features such as Highlight Correction", but that is a personal choice that reflects my style of shooting.
Steve
* I am famous for stating that "auto-ISO is evil" with my prejudice being based on the tendency for new users to get tangled in a Web of conflicting configuration choices.