I bought a Zeiss Nettar which came with a Novar 105mm f4.5 lens set in what is labelled a Prontor-S shutter (see photo). From what I have read, the Prontor-S did not have adjustable sync. However, this shutter has two switches. At the 2:00 position with respect to the photo, there is an indicator which can point to either a red or yellow dot. An "x" appears next to these. This seems to be a flash sync selector. There is another lever with a red dot, seen at the 4:00 position, with indicators labelled "M/" and "\F", with the slash symbols engraved and filled in yellow. From what I can deduce by playing with it, when the upper switch is set to the red dot, it means X sync, and in this case, moving the lower lever to "M/" actually seems to be charging the self timer. When the upper switch is set to the yellow dot, it means flashbulb sync. Moving the lower lever to M/ in this case probably means M sync, as the lever snaps back immediately on releasing the shutter, unlike the self timer function; however, I won't know until I develop the current roll in which I took a flashbulb photo. I assume F is for another type of flash bulb.
My first question is whether the order of cocking the shutter and changing these levers matters in terms of wear of any parts. The shutter hung up on a few of the photos in my first roll, and I think it might have been when I had inadvertently applied some light pressure to the M-F lever. My second question is historical: is this actually a mislabelled Prontor-SVS shutter, or were there variants within the Prontor-S type that are not documented? The top speed of this shutter is 1/250s. I can't seem to find any shutter or camera manual online in a casual search that describes this particular shutter.
My first question is whether the order of cocking the shutter and changing these levers matters in terms of wear of any parts. The shutter hung up on a few of the photos in my first roll, and I think it might have been when I had inadvertently applied some light pressure to the M-F lever. My second question is historical: is this actually a mislabelled Prontor-SVS shutter, or were there variants within the Prontor-S type that are not documented? The top speed of this shutter is 1/250s. I can't seem to find any shutter or camera manual online in a casual search that describes this particular shutter.
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