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This is the second version of Prakticar 300mmF/2.8,
also it was thought the last/only optical scheme.
note: I am not sure which optical design belongs to my Prakticar 300mmF/4.
See the first version > http://zeissikonveb.de/start/objektive/wechselobjektive%201980er/carl%20zeiss%20jena.html