RNIB PenFriend Audio Labelling Pen
This simple and easy-to-use labeling pen is designed to enables visually impaired people to record self adhesive voice labels on a wide range of items it may be of interest especailly to visually impaired photographers but photographers with disabilities generally may find it of interest.

PhotoRemote
Control your DSLR camera using your android device.
PhotoIRmote is the first DSLR Timer Remote Controller for android devices. It allows you to shoot your camera using the InfraRed sensor of your camera and an IRmitter (IR emitter) connected to your phone.
Ultra Magnifier
Turn your Android Phone into an FlashLight Ultra Magnifying Glass with fullscreen by using camera zoom and auto-focus. With this Magnificent Magnifier will Help to magnify read tiny print and words
Photometric
Tools for photographers. Allows you to calculate the aperture and the exposure time from a given ISO sensitivity and a given exposure value (EV).
TalkBack
Talkback, Kickback, and SoundBack are apps for the Android Accessibility Service to help blind and vision-impaired users use their devices more easily.
These apps add spoken, audible, and vibration functionality services to your device. They are system applications that were pre-installed on most device and are updated when the accessibility service is improved.