geyes30
25-Sep-2012, 21:53
Hi I just purchased a lens on eBay and the lens is largely unmarked, apart from the Bausch and Lomb pneumatic shutter, as well as a Premo label. Unfortunately it came without a lens board, and also has no mounting ring/flange. I am not familiar with older lens designs, so I am not sure how I should mount this. Are these lenses typically mounted directly onto a lensboard through a threaded flange, or are they mounted like modern lenses, using a mounting ring (I suspect the former, since the threaded portion is not really 'raised' off the back of the shutter to allow for the thickness of the lens board)?
I have also measured the threaded portion and found that the minor diameter is approximately 62mm while the major diameter is around 63.5mm. Does anyone know where I can find specifications for the thread (is it English or Metric? What is the pitch? etc.)?
I have attached a picture to this post. Hope someone can help me with this! Thanks!
I have also measured the threaded portion and found that the minor diameter is approximately 62mm while the major diameter is around 63.5mm. Does anyone know where I can find specifications for the thread (is it English or Metric? What is the pitch? etc.)?
I have attached a picture to this post. Hope someone can help me with this! Thanks!