Спасибо за ответ. Конструктив слабенький конечно , но зато цена приемлемая. У меня не зеркалка а Никон 5600. Всмысле я его специально с боксом купил

. Зеркалку я дома оставляю ввиду отсутствия к ней бокса

. Про листочки выяснил у производителя - это заклейка вспышки изнутри бокса

Черными если вспышка внешняя и встроенная не нужна. А прозрачными чтоб смягчить свет встроенной вспышки. ВО КАК
В исходном варианте-
3. Transparent flash diffusers: A sheet of peel off diffuser labels is included to help soften the light from the built-in flash. Place a diffuser label inside the housing directly in front of the camera’s flash. Press the label gently against the housing surface. It will cling to the surface, and will remain there for several dives or a couple of days. Use the diffusers to gain additional coverage from the flash and reduce Backscatter, which is caused by the direct illumination of suspended particles in the water near the front of the lens.
4. Black flash blockers: A sheet of peel off “blocker” labels is included. These are used when you are also using an accessory slave flash. Since the slave is more powerful than the built-in flash, you do not need this light for subject exposure. By blocking it, you will reduce the effects of Backscatter directly in front of the lens, but the burst of light from the built-in flash will still be seen by the slave through the top of the clear housing.