of the activities outlined in the Terw.s of Reference ere in any cese of a 
long term nature and would be expected to take longer then four years 
available since Lisbon, to bring to finality. 
The Chairman of each '"orking G-roup rill report on the results achieved, 
during the Lausanne Congress. It is therefore not intended to go into any 
greater detail in this Report. The future of these Corking Croups and their 
programme after Lausanne will also be debated at Lausanne. By making 
decisions on the work to be done during the Congress, it is hoped that the 
Corking Croups will be enabled to make a more prompt start than was possible 
after Lisbon. 
9. Technical Progress 1964 - 19&8 
(a) Airborne equipment Technical progress in equipment for Air 
Photography is inevitably slow, in view of the very high optical and 
mechanical performance already achieved. 
The 150 mn/90 O camera continues to have improvements made in its optical 
performance and in its mechanical arrangements. Creater emphases has been 
placed upon lenses with wider colour correction for use with colour and infra 
red film. Perhaps I can mention one example, the Lamegon PI 4.5/150 from Zeiss, 
Jena which not only covers a wide spectral range but has also had its optical 
performance specified throughout the spectrum in terms of optical transfer 
functions. A welcome innovation Rotary shutters are now almost standard, and 
give high efficiency at the fester speeds. (y4o0(£b sec.) These have considerably 
reduced problems of vibration and Image movement, which formerly have troubled 
camera users. The use of reseau cameras is spreading snd most manufacturers now 
have a reseau version available. 
The Super Wide-Angle Camera (120°) was first discussed at the 195& Stockholm 
Congress when it was considered a novelty of rather doubtful technical value 
Since Lisbon, a number of commercial super wide-angle cameras have become available 
and are being used for routine photography. These are still special purpose 
cameras and there is no evidence that they will supersede the 90 camera. However, 
only 20 years ago the 90 camera was something of a novelty.’.’ 
With the increased use of air photography for photo-interpretation and 
resource evaluation purposes, a need for simultaneous photography in separate 
spectral regions arises. Development of 4, 6 and 9 lens cameras has been reported 
from the U.S. A. to cover the visual and HI regions. We can expect rapid develop 
ments in this area. 
Exposure continues to be a problem with operators and many cameras have 
remotely adjustable lens apertures and shutters. 
Exposure meters are becoming available for measuring the correct exposure 
and reports from many users confirm their value. The step to automatic exposure, 
already widely used in military cameras, is a small one. Another approach is 
reported from Czechoslovakia where data from an airborne exposure meter is used 
to determine processing conditions on the ground. 
In spite of modern techniques such as radar, radio altimeters, inertial 
platforms, lasers, there seem to be very little effort to make use of such 
auxiliary data. The statoscope and the Airborne Profile Recorder are still the 
only widely used auxiliaries. This area would appear to warrant much more serious 
attention from photogrammetrists.