Quote:
Originally Posted by jc_braconi
You can see on the box the picture illustrate shows a threaded filter
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Actually the picture doesn't show all that clearly that the filter has threads. Neither do female threads on the out-side rear preclude the inside-rear from slipping on over the front-piece of a Summarit.
However the filter is an EL NY and could well have been a small run contracted by them for a specific purpose, such as fitting to early Summilux lenses prior to production of the Leitz filters which permit fitting of the hood. It is highly doubtful that EL NY issued filters for a hand-ful of prototype lenses.