Materials: 95% aluminum-magnesium alloys, 5% stainless steel (screws)
Process: plastic molds, hard surface oxidation, spraying of rubber oil.
Accessories: side door card cases, main part, back cover, three removable flag plate, two 4 * 4filter slots, two 4 * 4 filter rings, filters can be rotated.
Specification: front diameter 210mm * 150mm, maximum diameter of back-end 110mm, to the downwards matching with different block-rays according to different bores. Front to back distance of 65mm, it can be connected to ultra-wide-angle lens.
Performance: Quick release lock design, rapid side door for quick replacement of lens.
Filter rings can be rotated to facilitate installing polarizing filters.