Please advise the law of F 16 in photography!

Judging from the landlord's problem, it should be that the shutter speed is too fast, so it will prompt underexposure. The landlord should use M mode. Please adjust it to a mode (aperture first) and try again.

In addition, if you insist on the shutter speed of 1/250 (if the shutter speed drops below 1/ focal length after switching to a mode, it is not suitable for hand-held shooting, and there is no tripod), please change the film with higher sensitivity.

Please adjust the metering mode to spot metering (*) mode when you see the supplementary problem. After metering where the flowers receive uniform light, lock the exposure value and see what the shutter is.

In addition, if the flowers taken by the landlord are black or the direction of sunlight is from the side or back, it is necessary to increase the exposure appropriately. Because one premise of the law of F 16 is that the subject is basically close to 18% gray level.

Please refer to the landlord for the above information.