Feature: 1 Large diameter lens group, grasp massive lights through the lens group, see and catch the clear view with the viewfinder 2 Adopting the structure of two sets of wide angel optical lens , material of the lens are high quality pure K9 optical glass, which is manufactured through various procedures, such as precision grinding, polishing, ultra-wide multiple layers triple anti-plating films coating, etc. 3. The remaining parts are made of the aviation aluminum after a whole manufacturing processes of precision machining, precision sandblasting, surface treatment, surface oxidation, laser engraving etc. 4.Special lens films coating processing, function of waterproof, anti- scratch, anti-oil function. 5. It is the perfect solution for solving the problem of obstacle to observe the views under strong lights through LCD viewfinders. Our viewfinder is suitable for all kinds of environments of photographing. tech data: View angle: 76 degrees (equivalent 135 frame 28mm lens) Lens material: K9 Environmental protection optical glass Lens Films Coating: Full surfaces( total 4 surfaces) with function of waterproof, anti-oiling, anti-scratching, multi layers wide band green films. viewfinder tube material: Aviation grade Aluminum alloys. Hot shoe interface material:¡¡ Aviation grade Aluminum alloys. Lens surface treatment process: precision sandblasting + polishing + anodizing Lens diameter: 26mm(front) 20mm( back) viewfinder tube diameter: max 31.5mm hot shoe form: standard accessory: specialized leather bag( one) color: black, silver, rose gold specification:28/35/45 weight:72g packing size: 78*80*42