Hoods or lens shades help improve contrast by stopping out of frame light source entering the lens. LEE filters are square filters that can be used for effects or managing dynamic range, however as they mount in front of the lens with a holder you can no longer use your lenses standard hood. LEE have a standard, universal and wide angle hoods available.
LEE do not provide many specs for the hood on their website. To help others decide if this is right for them I have included measurements and pictures.
The Standard is the smallest of the three hoods. It actually has a very clever rail system which allows it to be mounted in a slot. When mounted on to a lee adapter ring this sits further back out of the way. All Lee products should have this and there would be no need for a tandem connector.
Filter weigh 150g
Width Height: External: 13.1cm x 13.1cm Internal: 11.1cm x 11.1cm Depth: Complete compressed: 3.5cm.
complete : 4.6cm hood & mount: 3.6cm hood only : 3.1cm
complete : 15.0cm hood & mount: 14.0cm hood only : 13.3cm
This hood is too small for use under 28mm on a full-frame camera.
On a crop sensor it is still good at 16mm
Vignetting examples: Setup for following examples, Canon 6D, wide angle adapter, Lee holder 3 slots (2 for filters, 1 for hood) then universal hood at minimal expansion.
above 16mm full-frame with filter holder
above 20mm full-frame with filter holder
above 24mm full-frame with filter holder
above 28mm full-frame with filter holder