Chris T wrote:
Here's the scenario - you take delivery of a new DSLR, and not wanting to have to fiddle about with settings - you decide to set it on AUTO ISO and just go out and shoot, to get a feel for your new toy, before you get into all of the elaborate settings, and the whys and wherefores. Then, someone asks you to post a photo - one you consider great - and you do - and then find, to your dismay, the camera chose to use a ridiculously high ISO on a bright sunny day. Now, here's the thing - there's NO NOISE evident. So, exactly what does the camera know - you don't? … Do you know what I mean? … Maybe, the electronics of your new toy - are sophisticated enough - to impose a high ISO without YOU trying to rein it in, and to do so - well. So, what are we missing here, in this puzzle? Do we artificially try to put a hold on the camera's CPU / electronics - when - in fact - the engineers who designed these computer-aided photo-taking instruments - know better?
Here's the scenario - you take delivery of a new D... (
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I would never set a new camera to anything auto, first I want to make myself used to the new toy, so I set everything to manual! Once I get a good feel for things and starting to know "her", I will play with some of the auto settings as well! I have to admit, I have never used auto ISO yet in any camera!
I just use some form of auto exposure. When very occasionally I want to go full manual I adjust using the exposure meter on the left side of the EVF. At worst that’s almost always a good starting point.
I would be all for replacing “ISO” with “GAIN” which (enlighten me if I’m wrong) more aptly describes what is happening to the voltages generated by each photo-element on the sensor.
I just use some form of auto exposure. When very occasionally I want to go full manual I adjust using the exposure meter on the left side of the EVF. At worst that’s almost always a good starting point.
I would be all for replacing “ISO” with “GAIN” which (enlighten me if I’m wrong) more aptly describes what is happening to the voltages generated by each photo-element on the sensor.
Mongo
Loc: Western New York
An ISO setting is not "gain." On one camera system it could be, but normally it is several parameters. As an example, on some sensors, there is pixel aggregation, at high "ISO" settings, which will result in lower spatial resolution, which may look like more "grain."
Pixel aggregation may be used because the electrons from several wells are aggregated together to provide a higher signal, not as suspectable to the low signal noise observed near the lower quantization level of one pixel or cell.
A typical aggregation in an area sensor is 2x2. In this case four wells are aggregated, and there is signal with lower perceived noise from four wells than from four individual wells. In reality a lower light level has a smoother quantization curve at lower light levels because there are more quantization points for a a given low light level range.
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