|
Size: 2718
Comment:
|
Size: 2471
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| Here at the NCMI we're running two Nikon 9000 scanners on two Windows machines. We have modified the holders (FH-869M) in-house so that the film is sandwiched between two sheets of anti-Newton glass. We also found that the film holders/scanning system had a slight downward tilt from SW the NE (looking from above the machine). | Here at the NCMI we're running two Nikon 9000 scanners on two Windows machines. The holder type we modified was an FH869M, glassless holder, for both scanners. It is a trivial operation. The FH869M holder is a mounted film holder. That is, it's designed for film surrounded by a plastic support rather like 35mm slides. Given that the glass plate is relatively thin, and the scanner has a fairly broad focus range, all you really have to do is shave off the surface of the holder so the glass plate can support the film at a height close to the height the mounted film would have been at. Since the operation is simply milling down a few protrusions from the surface, there are no technical drawings. Since you will end up supporting the film on the corners with thin pieces of 2-sided tape anyway, it doesn't really matter if the milling operation is absolutely perfect. |
| Line 3: | Line 4: |
| The bottom piece of glass is glued to the film holder, on which the film is placed, and then the top sheet of glass is placed on top by the Nikon scanner operator. The top piece of glass and film are held roughly in place by make-shift guides. Important points are | In particular, the bottom piece of glass is glued to the film holder, on which the film is placed, and this is sandwiched by another sheet of glass which is placed on top by the Nikon scanner operator. The top piece of glass and film are held roughly in place by make-shift guides. Important points are |
| Line 9: | Line 10: |
| * We did this for two different Nikon 9000 scanners, and found that there was roughly a consistent tilt, though varying in extremity. The tilt is only slight, so its effects are not all that great. | * We did this for two different Nikon 9000 scanners, and found that there was roughly a consistent tilt, though varying in extremity. The tilt is only slight, and its effects are not all that great. |
| Line 11: | Line 12: |
| The glass didn't come with the holder we had to order it in. Because the bottom piece of glass is glued it stays there, but the sandwiching piece just slides around unless you think of someway to hold it still - so we just put some bits of thick tape here and there so everything stays approximately still. We had to shave some plastic from the bottom too, just using a pocket knife. It's a bit of a hack but it works fine. | The glass didn't come with the holder we had to order it in. Because the bottom piece of glass is glued it stays there, but the sandwiching piece just slides around unless you think of someway to hold it still - so we just put some bits of thick tape here and there so everything stays approximately still. |
| Line 18: | Line 19: |
| The holder we modified was an FH869M, glassless holder. It is a trivial operation. The FH869M holder is a mounted film holder. That is, it's designed for film surrounded by a plastic support rather like 35mm slides. Given that the glass plate is relatively thin, and the scanner has a fairly broad focus range, all you really have to do is shave off the surface of the holder so the glass plate can support the film at a height close to the height the mounted film would have been at. Since the operation is simply milling down a few protrusions from the surface, there are no technical drawings. Since you will end up supporting the film on the corners with thin pieces of 2-sided tape anyway, it doesn't really matter if the milling operation is absolutely perfect. |
=== How To Take Manual Focus Readings Nikon Scan 4.0 === |
Here at the NCMI we're running two Nikon 9000 scanners on two Windows machines. The holder type we modified was an FH869M, glassless holder, for both scanners. It is a trivial operation. The FH869M holder is a mounted film holder. That is, it's designed for film surrounded by a plastic support rather like 35mm slides. Given that the glass plate is relatively thin, and the scanner has a fairly broad focus range, all you really have to do is shave off the surface of the holder so the glass plate can support the film at a height close to the height the mounted film would have been at. Since the operation is simply milling down a few protrusions from the surface, there are no technical drawings. Since you will end up supporting the film on the corners with thin pieces of 2-sided tape anyway, it doesn't really matter if the milling operation is absolutely perfect.
In particular, the bottom piece of glass is glued to the film holder, on which the film is placed, and this is sandwiched by another sheet of glass which is placed on top by the Nikon scanner operator. The top piece of glass and film are held roughly in place by make-shift guides. Important points are
- The bottom sheet of glass is leveled relative to the scanning system - we did this by elevating the corners of the glass plate using tiny cubes of sticky tape piled in stacks. Then, in the Nikon scanner GUI, we took focus readings on the corners and in the middle of several test films, until it was clear that the focal depth was relatively consistent across the entire film. Also, [:EMAN1/FAQ/e2scannereval results::e2scannereval.py] proved a very useful tool for the qualitative detection of tilt.
- The anti-Newton glass is only coated on one side, this is the side that faces the film in our design.
- We did this for two different Nikon 9000 scanners, and found that there was roughly a consistent tilt, though varying in extremity. The tilt is only slight, and its effects are not all that great.
The glass didn't come with the holder we had to order it in. Because the bottom piece of glass is glued it stays there, but the sandwiching piece just slides around unless you think of someway to hold it still - so we just put some bits of thick tape here and there so everything stays approximately still.
Below are some pictures of our film holders.
attachment:IMG_3242.jpg attachment:IMG_3250.jpg