Attaches to the front accessory thread of (90mm-360mm) lenses; provides optimum shading of the lens to prevent all stray light. Rack & pinion adjustment allows selection of optimal setting by actual preview; width is easily adjusted; incorporates 3" gelatine filter holder. Maximum and minimum extension of bellows: 100mm and 30mm. Supplied with 77mm mounting ring. Can be used on other brand lenses with step down rings.