Essentially, ISO as a camera function describes how sensitive the sensor is to the light that it receives. This means that a high ISO number means that the sensor very quickly gathers information (ie allows me to use a fast shutter speed) but because the picture information is gathered so quickly, the smooth quality of the photo is "penalised", introducing more grain/noise in to the photo. At the opposite extreme, a low ISO gives you great images with very little noise, but you will only have slower shutter speeds at your disposal. Every camera handles ISO and noise slightly differently, but let's split them generally in to the average compact cameras that are used for digiscoping and DSLRs. ISO 800 on Canon A590IS. faster shutter speed from the high ISO made this shot possible, despite being at night. Had to sacrifice image quality through noise. Compact digital cameras for digiscoping: With, by way way of example, a Nikon P6000 or P5100 (both very common digiscoping cameras), using the minimum ISO of 64 gives nice images, but anything above 200 tends to bring a lot of noise in to the images and is then only really interesting for key rare-bird identification photos when nothing else will work. DSLRs for digiscoping: Entry level DSLRs like the Canon 1000D or Nikon D3000 have effective ISOs going up to 1600. This range is fairly usable, and for various reasons, when using one of these cameras, I would normally start digiscoping with an ISO1600 and drop it down to ISO800 ...
Tags: ISO, Lions, on, Olifants, river, camp, Kruger national park, dale forbes, digiscoping, shutter speed, safari, photography, savanna, canon, 1000D, spotting, scope, telescope, DSLR
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