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Geometrical accuracy of MK—4 is characterized by 
the value of summary mean square distortion of image 
points coordinates equal to -»— 9 mcm. 
Star camera CA—3P equipped with the objective 
with focal distance of 280 mm provides for 
acquisition of images of at least 3 stars of 5-th 
star magnitude on the frames with 80k170 mm size 
obtained synchcronously with the frames from CA-M and with 
the time difference of shutter operation of not more 
than 65 mm. Moreover the actual value of asynchronism 
is imprinted in the interframe intervals of the film 
CA-3P. 
In comparison with MKF—6 camera MK—4 has the 
following advantages: 
1- A possibility of the survey with 82.6 degrees 
of the orbit inclination allows to survey also the 
northern latitudes of the Soviet territory, and MKF—6 
camera with the orbit inclination of 52 degrees 
provides for a survey of medium and southern parts of 
the USSR territory, which make not more than 25 % of 
the Soviet territory. 
2. Traditional Soviet frame size of 180x180 mm 
allows to process the survey data in different 
branches of national economy on the available 
equipment . 
3. Camera MK—4 measures image shift compensation 
by linear way which is different from the angular one 
of MKF—6 camera and so it guarantees technically 
higher accuracy of the image motion compensation which 
impoves their informative and measuring characteristics. 
4. Photocamera MK—4 has higher photometric 
accuracy as the influence of the interchangeability is 
excluded in that camera. 
5. The high accuracy of photometric calibration 
and composition of operational information of MK—4 
provide for a possibility of the automated processing of 
mu1tispectra1 space photodata.