F-1734is weak diopter that allows to extend field of few by 1-2%. I don't know what exactly it is used for since such small advantage doesn't seems reasonable to make a special filter for it. So, original purpose was something else, probably.
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Review by Andrei BALOTNIKAU
Lenses with a focal length of 1734 mm (0.6 diopters) is used to shoot subjects closer than 2 meters from the camera by shifting the front field of few up to 0.9 meters.
Without the lens minimum focusing distance of camera is 2 meters. (Used with russian cinema optics "Meteor-5-1"). "Meteor-5-1" - the lens for 16 mm film cameras "Krasnogorsk-2" and "Krasnogorsk-3" with a frame size of 7,45 × 10,05 mm. (Posted on 11/9/2012)