What's the matter with the diaphragm next to the photo taken from the film?

There is an aperture next to the photo taken from the film because the lens leaks light.

For SLR cameras, the eyepiece optical viewfinder of the lens is the easiest to leak light, because the optical viewfinder is a half-pentaprism made of optical glass, and the light is reversible, and the external light will enter from this place and participate in imaging, while the viewfinder of micro-single camera is changed to liquid crystal, so it is not easy to leak light.

Therefore, Nikon's single camera is equipped with an eyepiece curtain to cover the lens extractor. Canon SLR camera is to remove the eyepiece viewfinder eye mask and cover it with a black plastic piece on the back strip. In fact, it is recommended to block it with a black tape. During long exposure, close the Nikon 81 eyepiece curtain to prevent light leakage, or stick it with black tape.

Note of lens light leakage:

The shoulder screen of SLR camera sometimes leaks light, which is unlikely. If the eyepiece and the sight distance window are covered, the filter is also made of light-leakage sponge, and there is light leakage, then it can be concluded that there is light leakage in this place.

Tipsy Cam's filters are all inspired by classic cocktails, so the effect is like colorful cocktails, with its own wine smell. Random light spots and colorful filters can create an inexplicable psychedelic beauty. In addition to simple tone filters, each filter of Tipsy Cam also has its own light leakage effect, and the light leakage position will change randomly.