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In the USSR there was a few oscilloscope adapters (hoods with bindings to oscilloscope and a camera) for the RF and SLR cameras and as an example of true (specially constructed) oscilloscope camera you can find here Snezhinka
Dmitry, where I was working we had 100s if not 1000s of oscilloscopes, but no cameras or hoods with cameras to make occilo-pictures. In fact I never see one alive, I did not know that they existed when I was working with scopes in USSR. Do not see them for sale on eBay as well. I do not say that they not existed, but they definitely was produced in very small quantities and they are rare.
In coronary in US oscilloscope cameras are common and easy to find, probably because they was pushed by salespeople, and because they out-lived scopes they was designed for.
The scope camera would be very useful in many occasions, in college we had to cut cooking paper, put it on the scope, and trace the signal to prove our findings in the lab. And when you need to compare signals you would use such cameras, if you would have one. And for teaching purpose.
Snezinka camera you was pointing was made in 1990, to little to late for me. And I can not figure out how can you attach it to the oscilloscope, most of them had rectangular screens at that time.