A popular professional 3 stage, 4x5.65" clamp-on matte box. The Arri LMB-25 is light and compatible with a large range of lenses via removable clamp adapters.
The MMB-2 matte box from Arri is very compact and lightweight, weighing just 900 grams with the top flag. It clamps directly onto lenses with a 114mm front diameter, or it can be attached to 15mm LWS rods.
The Chrosziel 450R2 Super Wide is a 15mm LWS matte box and features two independently rotating filter stages with filter trays for both 4x4" and 4x5.65" filters. Lenses as wide as 16mm (super 35mm) can be used with this matte box.
The OConnor O-Box is ideal for use with a wide range of lenses - both cine and stills. It has a large 150mm rear plate to accommodate larger lenses, but when using it with the supplied universal rings it is equally suited to small diameter stills lenses.