Leica rotating viewfinder made by S.Y.F.T Ltd.

[Giuliobigazzi]

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Does anybody know anything about this Leica S.Y.F.T non optical viewfinder or the company that made it? It has a parallax corrected rotating mask adjusted with the side wheel. 
I have only found that S.Y.F.T.ltd. London was dissolved in 1954 but no other information.

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[luigi bertolotti]

Intriguing device... why do you define it as "non optical" ?  What focals does it provide ? I read 13,5 cm and 9-5 (two frames ?) and suppose the 3rd set is for 3,5 cm... but cannot read...

[sabears]

I guess there are only windows, no lenses ...  like to see through the keyhole  😉

[Giuliobigazzi]

It has no lenses at such but a rotating barrel withing a barrel, with different size holes, viewed through a celluloid film. Focal lengths are 3.5cm, 5cm, 9.5cm which is strange, and 13.5cm. 

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[dg4mgr]

This is a very interesting device, thanks for sharing. Maybe you can find out more about it if you succeed in tracing the mysterious 9.5 cm lens for Leica TM, never heard of one.

[dg4mgr]

PS: Could find one, interestingly also British: Taylor & Hobson Cooke Telekinic Anastigmat 3 3/4"(=95mm) f3.3. Seems extremly rare but existed in Leica mount.