Materials: 95% aluminum-magnesium alloys, 5% stainless steel (screws).
Process: plastic molds, hard surface oxidation, spraying of rubber oil.
Performance: Quick release lock design, rapid side door for quick replacement of lens.
Includes: side door card cases, main part, back cover, three removable flag plate, two 4x4 filter slots, two 4x4 filter rings, filters can be rotated.