I am somewhat confused with shutter speed and exposure, as it seems to some extend do the same - expose to a light, could,some please explain what a difference is? Also ISO, ie sensitivity, seems to be similar to the other two as well.
Am I correct that its impossible to change an aperture using this app on Lumia 920?
In the top manu what does FPS stand for and what does it do?
Shutter Speed : digital cameras capture pictures by opening its shutter to let light in and thus letting the sensor identify the colors and convert it to a picture. (AS LIGHT IS THE PICTURE)
So in order to accumulate enough light ie: details. the shutter needs to stay open depending on the amount of light the picture needs.
Exposure: its a software alternative to adding more light or less to a certain picture
ISO: is the sensitivity of the sensor to lights. its the push of extra electricity to the sensor for it to get more light and vice versa.
You'll never understand it unless I give you a usage example.
You're at night and you want to take a picture of a still object with minimal lighting. Using your lumia 920 switch to Night Mode and try taking a picture with the phone in your hands.
the result will probably be blurry. because even with OIS shakes will hurt night images. Blur occurs because light accumulates in the sensor in a layer like fashion. (Much like in photoshop when you stack layers upon layers the resulting image is a brighter version of the original layer. ) when you shake your hands the layers become scattered sometimes lightly sometimes bluntly.
. So if you insist on taking hand held pictures (no tripod at your disposal) you need to decrease shutter speed time which means you'll decrease the number of theoretical layers that could be effected by a shake but as I said before if less layers are stacked it'll be less bright).
So what would you do you need to increase your sensor's ability to see light and here's where you need ISO settings . get it ?its about balancing two values to get the best result.
What you get is a good picture with no blur but its a little dark. ( using the built in editing app you can auto fix it to look brighter and as there's no blur it won't get missed up.
another situation would be , you want to capture a landscape, the sun is bright , you've got a tripod set and you want a CLEAR picture , what you do is lower the ISO settings , then increase the exposure time just a little bit , and what you get is a picture with no noise what so ever.
What is that purple noise I keep seeing in night photos. When the ISO is high the amount of electricity is higher that electricity will create noise (a fact in any wire ) and thus night photos will always have this in ****ty cameras. ( Nokia's algorithms of spotting and removing that noise is just amazing.)
in the case of the lumia 920 , the camera has not physical shutter, instead that process is emulated by pushing electricity to the sensor. that's why Exposure value is in fact a mix of Software and shutter speed.
here's a case scenario that is cool , run your camera set iso to 100 and increase exposure to the extreme , set your phone on a table or hold it hard, turn off the lights in the room take a picture of your friend while he draws a shape using a small flash light ( ( the flash should be pointed at the camera and he has 2 secs to do so) , the resulting picture would look amazing.