canixus
vit40
Any comment about my analisys of non.standard ISO values in the previous post?
Yes, higher that 1600 ISO is only a software overexposure: we can obtain the same result (exposition of 3200 ISO) if applying +1 IL to 1600 ISO Raw file with software like Adobe Lightroom ! But I don't know with intermediate ISO between 100 and 1600 ISO.
The real utility is for Jpeg files.
I'm a RAW shooter, and reading this yesterday was disappointing to me at first.
I've been using -1EV to get higher shutter speeds in low light for years now, so being told that that's all that the ISO 3200 setting is doing - along with telling the camera's JPEG-rendering routine to add +1EV to compensate - made me scratch my head, since I thought that what the hack was doing was telling the camera to actually apply more amplification to the signal from the sensor!
So I looked up the specs for the 40D, which uses the same sensor, and saw that on the 40D ISO 3200 is an "Extended" setting - which I guess means it's doing exactly the same thing.
I've decided that it's still a convenience, since what I would do when using -1EV was to manually boost the rear-panel LCD's brightness so I could see what I was getting (though the degree of boost was not calibrated). By applying a matching compensation to the camera's JPEG-rendering routine, the hack automatically keeps the display brightness accurate.
I'm delighted to have true spot-metering, so I can avoid underexposure from backlighting by telling the camera to ignore the bright background completely, not just reduce the weight it's given.
However, I've made no use of the focus patterns because there are just too many of them to tap through! Please see if you can use the front of camera "main dial" to scroll forward and backwards through them. Not only would this let us scroll backwards, "1 click per setting" would mean several settings could be rolled through per finger swipe, making it much faster to get to the desired pattern.
PS - I'm using the November 1, 2010 Autoexec.bin. My normal operating mode is "Av." What would I gain by using the most recent version?
