Anyone with information to share about this lens?
On the side of the Waterhouse slot, it's written:
"Extra-rapide
Portraits
Paysages
Reproductions
B D"
Two groups. Back seems a glued doublet. Front is a casket fitted with a bayonet marked "Lentille pour faire plus grand". The corresponding FL is around 430mm measured from the Waterhouse, aperture f8.
The lens has a pleasant spherical aberration :-) and enough coverage for 8x10. Any guess who's B D?
Kind regards,
https://flic.kr/ps/3WKjcu
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