Ross London 12in xpres f/5.6 (e.m.i) Lens

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Howdy do,

I have come across this rather unusual and seemingly uncommon lens - I think that it is an old aircraft lens but I can't find any information about it. Any ideas? It measures about 5 x 5inch and weights roughly 3kgs
16062290837093887626040017223578.jpg
16062292764433124576428453960046.jpg


Many thanks in advance
 
This isn't the usual 12" f4.5 Xpres, it's the f5.6 E.M.I version, that means Extra Marginal Illumination, it's designed and optimised to be used at Infinity and have better edge sharpness, Ross didn't recommend it for closer distance. Usually they have an MOD number (Ministry of Defence).

The front element has quite a curve, presumable the rear as well, this is to help even out the edge illumination. As you can see from the images above the normal Xpres has a far flatter front element. This FL isn't listed at that aperture.

Ian
 

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