I made a picture tutorial for people wanting to convert the Navitar 25mm f0.95 lens. I cannot copy the pics over fron my site -can anyone help me ?
http://www.mishra.tv/wordpress/?p=108
Navitar c-mount 25mm f0.95 conversion to micro 4/3
Navitar lens before machining
Remove 3 screws with a jewellers screwdriver and remove the the rear element ring.
Picture of the second rear element ring.
Use a wet sandpaper. Put some water on it and rub the second rear element in a figure 8 motion. I had to stop and test during the machining – the reader can machine it until the very edge of the screw hole.
Closeup of the second rear element.
Put the 2 rear elements back on the lens and put the screws back on.
A picture of the finished lens. I tested it with the RJ and the Henry adapter. The focus ring now moves all the way across the near to far range. However, I still cannot achieve infinity focus – this problem is due to an incorrect focal flange distance. The lens is too far away from the sensor. How do I solve this ?
Navitar lens
As a part of shooting our film – Fountains, there are a lot of nighttime location shots. As we are operating on a small budget, we do not use lights, and require fast lenses. The Navitar 25mm f0.95 matches with the GH1 and GF1. However, in the original form the focus rings pushes against the adapter 1/3rd through its useful range. Here are some pics about how I machined this lens to fit the RJ and the Henry c-mount m4/3 adapters. At this time, I still cannot obtain infinity focus – this seems to be due to the focal distance being incorrect.
Hudson has a similar mod here, but no description and the pictured lens is a Leitz.
http://forum.getdpi.com/forum/showpost.php?p=189529&postcount=29
At this time, the focus ring moves across its entire range.
http://www.mishra.tv/wordpress/?p=108
Navitar c-mount 25mm f0.95 conversion to micro 4/3
Navitar lens before machining
Remove 3 screws with a jewellers screwdriver and remove the the rear element ring.
Picture of the second rear element ring.
Use a wet sandpaper. Put some water on it and rub the second rear element in a figure 8 motion. I had to stop and test during the machining – the reader can machine it until the very edge of the screw hole.
Closeup of the second rear element.
Put the 2 rear elements back on the lens and put the screws back on.
A picture of the finished lens. I tested it with the RJ and the Henry adapter. The focus ring now moves all the way across the near to far range. However, I still cannot achieve infinity focus – this problem is due to an incorrect focal flange distance. The lens is too far away from the sensor. How do I solve this ?
Navitar lens
As a part of shooting our film – Fountains, there are a lot of nighttime location shots. As we are operating on a small budget, we do not use lights, and require fast lenses. The Navitar 25mm f0.95 matches with the GH1 and GF1. However, in the original form the focus rings pushes against the adapter 1/3rd through its useful range. Here are some pics about how I machined this lens to fit the RJ and the Henry c-mount m4/3 adapters. At this time, I still cannot obtain infinity focus – this seems to be due to the focal distance being incorrect.
Hudson has a similar mod here, but no description and the pictured lens is a Leitz.
http://forum.getdpi.com/forum/showpost.php?p=189529&postcount=29
At this time, the focus ring moves across its entire range.
