After that I started messing with a bright lamp. Depending on how close I move the camera to it I get different TV/AV combinations listed. The interesting thing is that when zoomed out this varies on getting closer to the lamp:
1/25th f 3.4 (small lamp, dark room)
1/1000th f3.4
1/2500th f 4.5
1/3200th f5.0 (bulb at full frame height)
ok, we have +/- EV adjust
I set it to - 1EV and stay close up / go even closer
1/4000th f 6.3
1/4000th f 7.1
I set it to - 1EV and I get RED typography on
1/4000th f 7.1
The camera mimics Iris in these listings. I can half press the shutter at each position and then shoot whatever I want. While it was still day outside I tried doing that with an override for ISO at 125 and Exposuretime (I think 1/15th) and shot out of the window. That is the camera said f 3.4 or f 7.1 before taking the shot, neither AV nor ND filter were being overridden.
I blurred one image by accidental shake but exposure is identical between the two. I know don't trust the Exif but it matches what the camera said, too.
Here is a download:
http://www.filedropper.com/weird1
Then returning to the above but zoomed in the aperture range presented by the camera changes.
1/50th f5.6 (bulb adjacent to frame)
1/2000th f6.3 RED (bulb fully in view)
a position where the exposure computed is 1/2000th f6.3 - that is in white type can be found
The claimed aperture range is much narrower. At only a little zoom it is f 4.0 to f 6.3.
