Do you know whether to choose RAW, Jpeg or RAW+Jpeg files? Do you know what the difference is?
Jpegs are compressed files and the general format for...
File Size and File Type
February 20, 2014
May 12, 2014
ISO / Film Speed
April 14, 2014
Do you remember buying a film and choosing the film speed - did you buy a 200 or a 400 and do you now why you would choose each one? The light available wil affect the ISO you choose.
ISO or film speed (25 50 100 200 400 800 1600 3200) refer to how sensitive the camera’s sensor is to light (or how sensitive the film was before digital cameras).
It’s a linear value, so double the number and you double the sensitivity.
The smaller the ISO number the less sensitive the sensor is (so more light is needed).
The bigger the number the more sensitive the sensor is (less light needed), but the harder it has to work to, which results in more digital noise.
So when light levels are low we can choose a big number ISO, which wil enable us to take a photo, but the images may become grainy. When light levels are high we can choose a low number ISO which means are photos will be crisp and sharp.
Every camera has a base ISO, usually between 100 and 200. This is where image quality will be optimal, and you should move away from it only when you have a good reason to. Always choose the smallest number ISO possible that enables you to take the photo you want.
More light available = use a smaller ISO number eg 50
For example on bright days or in a studio with controlled light
sharper, smoother, crisper, less noisy photos
Less Light available = use a larger ISO number eg 400, 800,1600
For example in the evening or in a dark venue
When using a large ISO, photos will become grainier and noisier.