Paul Ewins
29-Jan-2009, 22:14
Since there seems to be no information available on this lens I thought it best to make some comments about one I have just received.
It is a four element, symmetrical lens looking roughly like this: (( (| |) ))
The inner elements are much smaller and fit almost entirely within the rear of the outer elements. The elements are held in place by the trim rings which unscrew easily allowing them to drop straight out of the cell.
The cells are a straight fit into a Copal 3s (or Copal 3 with the 56mm threads), however they will probably need shimming. In the barrel, with original shims, the overall length was 53.5mm. When I put the cells in the Copal 3s, still with shims, the length was 52.5mm
Circle of illumination at f4.5 was around 250 - 260mm and didn't seem to improve much as I stopped down. At some point I'll try a few sheets of 8x10 and see what it really covers.
It is a four element, symmetrical lens looking roughly like this: (( (| |) ))
The inner elements are much smaller and fit almost entirely within the rear of the outer elements. The elements are held in place by the trim rings which unscrew easily allowing them to drop straight out of the cell.
The cells are a straight fit into a Copal 3s (or Copal 3 with the 56mm threads), however they will probably need shimming. In the barrel, with original shims, the overall length was 53.5mm. When I put the cells in the Copal 3s, still with shims, the length was 52.5mm
Circle of illumination at f4.5 was around 250 - 260mm and didn't seem to improve much as I stopped down. At some point I'll try a few sheets of 8x10 and see what it really covers.