no pictures until later
lens itself is black body, barrel, marked 8.5 inch f5.6 Anastigmat.
On the front rim is: A.M. and a crown and then No. 2
might be a process lens
no pictures until later
lens itself is black body, barrel, marked 8.5 inch f5.6 Anastigmat.
On the front rim is: A.M. and a crown and then No. 2
might be a process lens
"A.M." means Air Ministry, Crown indicates Crown property. An aerial camera lens used by the RAF. There are very few process lenses as fast as f/5.6.
Count reflections. Probably a tessar type, also might be an Aviar
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