photostat
reflex camera
long Tom
depth sounder
photoglow
photorefractor
sunphotometer
swimming hole
subaqueous
respirometer
photomicrometer
focusing screen
photodevice
flash camera
viewer
optical lens
actinoelectricity
camera lens
ultrasonoscope
Verascope
videoduodenoscope
hydroplethysmometer
photofluorograph
aerocamera
nanoprobe
goniophotometer
fluviometer
photometered
fluorography
photostimulator
photoheliograph
photoresistive
photospectroradiometer
focal depth
metrogon
diaphragm
hydrophone
focimeter
stop
photometer
photofluorogram
aqualung
line scan
ultramicrospectrophotometer
exposure meter
lum
pantoscope
wash
light meter