OPA OT AN PNR PETE
CROP SESS
RC ERR sci LR EURE Ve ti VE La CU JT PL LE DA Poh HC SA
Question 3: Do you have good control of temperature and pressure and can
you give range?
NOTE; While many aircraft are not pressurized, some cameras are sealed with
rubber gaskets subjecting the lens and filter to external temperatures and
pressures. A temperature gradient is thereby created (see figure.1).
Temperature Control (Windows) 17
No Temperature Control 26
Camera Heaters 19
Pressure Céntrol (Windows) 17
No Pressure Control 53
Reduced Pressure 8
Pressure to 30,000 feet, „42°C
Question 4: Do you have a window? Is it heated? 0%
No Window 55
With Window 17
Window Not Heated 7
Window Heated 10
Question 5:
a. What are the coldest temperatures at Which you do aerial surveying?
b. How do you protect the camera prior to flight?
c. What would be the maximum cold temperature during flight.
a and c are essentially the same question and where there were differences,
the coldest value was used. Figure 6 shows the distribution of the 67
values plotted which extend fmom -60'C to + 20°C and peak at 30°C.
862 lies between -50°C and -5°C and 60% were 300C or lower. @ à
The answers to preflight protection of the cameras are most interesting.
They show that many photographers are knowledgeable of temperature problems.
21 store camera in aircraft
7 store in air conditioned area
9 store in carrying case
17 have no particular protection
2 gradually bring to outside temperature