Are there any commercially available pieces of equipment that may help disabled photographers?
The Manfrotto Magic Arm, clamp and camera bracket have been very useful to several of our members. You might like to look at www.speedgraphic.co.uk for the Ergorest Multi Tripod which can hold a camera in front of the face and at www.conceptusinc.com/connection.htm for mouth operated switches designed for sky divers! The Zig View viewfinder adaptor that is becoming popular can be bought from www.warehouseexpress.com and the Cullman Magic Clamp can be found on www.binocularhouse.
