50 mm plano convex (R456) 
8 mm plano convex (R473) 
200 am doublet (R483) 
200 mm gimble mounted doublet (R486) 
for checking MIF equipment at large field angles. 
Petzval f1.6 50 mm lens (no report available) 
SIRA has recently developed a 20 mm f.1. lens for infrared use. 
Comparisons of equipment accuracy have been carried out using 
wide angle aerial reconnaissances lenses (Report number G396), 
binoculars 7 x 50, and a telescope 10 x 40. SIRA is at present 
constructing a standard telescope for accuracy comparison measure- 
ments. 
A workshop guage has also been developed for afocal systems 
(this is now available through Ealing Beck) as well as a measurement 
system for lenses in the infrared 2-14 um. A quality control system 
for T.V. and cine lenses is in the development stage. 
SIRA is presently carrying out research into methods of assessing 
veiling glare, and has written a specfication on this topic. Work 
is also in progress (in conjunction with Reading University) on 
the comparison of OTF calculations 
5.2 Belgium: Wilmet, of the Institute of Geography reports many 
interesting studies on imagery, particularly involved with the use 
of color, false color and multiband space photography. One purpose 
is to increase the legibility of spectral signatures of pedological 
units as well as the phenological characteristics of associated 
vegetation on Lansat satellite images. 
There are no reports of MIF studies or use. 
5.3 Hungary: Gerenscer, University of Forestry3/ reports the develop- 
ment of automated edge gradient analysis techniques, operating in 
the O to 50 cy/mm range. The main program computes the line spread 
functions and the MTF and controls the digital plotter used for 
graphical representation. For ten repeated recordings, he reports 
a 2% standard deviation of MTF, but due to statistical variations 
(smoothing, noise, etc.) has not yet been able to exploit this accuracy 
in practice. The first step, tracing, appears to be the most vulner- 
able. (Further progress may be reported at the Congress.) 
5.4 India: OTF/MIF studies are being done in India in the Department 
of Applied Physics, in the University College of Technology. Some 
studies are reported in progress at the Indian Institute of Technology, 
Madras. No details are presently available. 
5.5 Finland: Hakkarainen reports38,39 the use of a specially designed 
goniometer and a test field for determining MTF and resolving power. 
His data is such that it is possible to compare laboratory and flight 
results. 
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