introduction on DSLR's

We have learnt how use shutter speed how small the lens is the faster it will focus it will be the larger the lens the slower the shutter for the lens so it will blur
it can go from 4000 frames per second to 1 frames per second,

The D40's high-resolution image quality is made possible by Nikon's high-performance 6.1-megapixel Nikon DX-format CCD imaging sensor and exclusive Nikon image processing engine which assures stunning sharpness and colour.