I love fast projection lenses, and when i saw a mysterious Ross projection lens, with 4.5" front diameter, i just couldn't resist
The serial should belong to lenses made in the '50, IF the projection lenses followed the same numeration as the others.
The focal length is a total mistery, i found the auction just minutes before the end, and i had no time for any inquiry. On a whim i decided that i wanted that glass... unfortunately somebody else had the same idea, so the price went a little too high for my taste (next time i have to think twice before bidding in pounds!).
Before asking anything on this forum i did a quick search. I found nothing about the lens, but a general reference in the VM about a certain "Projection Triplet e.g. in 8in" made before WWII.
Ebay UK gave me a clue: item 390372777939. It is a Ross projector/magic lantern which has two lenses, the bigger one looks to be the same i have purchased.
Does anybody know something about those projectors?
Did you try the big objective as a taking lens? My guess is that it should be a fast triplet, but i have no idea about FL and speed.
I welcome any information, practical and historical.
From the picture i see that the flange is solidal to the barrel, and that there is no internal stop which limits the speed (as is commonly found in many projection petzvals and some projection triplets). I hope the lens will cover at least 5x7, with some swirls toward the edges... if i am right it's not badly spent money
ciao
CJ
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