Sigma has renamed its flagship digital slr camera the sd1 to the sigma sd1 merrill which is in honour of richard merrill inventor of the foveon sensor technology on which the sd1 is based the sigma sd1 merrill includes the same features performance and specifications as the original sigma sd1 however the price is substantially revised the revolutionary image capture system features a 46 megapixel foveon x3 type image sensor to ensure outstanding resolution and natural rendering with r