ISO terms - The Mysteries Of The Borrowed Camera & The Basics Of Kitchen Utensils

A good friend lent me a DSLR camera with the caveat that "If I lose it, break it, scratch it, I have to sell my car to pay for it".

I signed in blood.

In his kindness, I have received a suitcase of lenses, filters, flashes and a scary number of bits and bobs.

Having not figured out the ISO thing, I thought I'd try out the camera with the lens that came attached and just fiddle with the that ISO thing...

So... I wander around the house with this fantastic piece of kit....

A Nikon D7000 with a Sigma 18-200mm lens @ 98mm, f/5.6 and 1/160s.

The pictures were taken under a poor fluorescent light which tested the sensitivity between 1250 and an amazing 25600 ISO.

 1250 ISO

 4000 ISO

 6400 ISO

 12800 ISO

25600 ISO

Without bothering about white balance, the full resolution image does get "grainier" as the ISO rises. Given the resolution of  the original RAW images (4928 x 3264), you would have to consider your target output before deciding whether grain would make a difference.