[JA]

Hello All,

I hope everyone's happy and well.

I'd like to ask if anyone recognises what appears to be a large objective cell from possibly a 10 inch refractor telescope which includes collimation adjustment screws, possibly military,industrial or aerial photography ???. The design and finish looks like 1960s to perhaps 1980s. There is a suggestion of faint purple multicoating so perhaps post 1970s/80s. The glass lens is Plano convex (doublet unsure???) of unknown type and is 260mm in diameter and reasonably heavy - 8kg.

Has anyone seen one of these before or know what it is, or might be from?

Thanks in advance for your thoughts and suggestions.

Best
JA