1. Test overview.

This test is used for adjusting the sharpness level so that it is initially able to carry out the next test. Then, a precise adjustment will be made to reach the best sharpness result.
This test can be done only on IM1500 Pro version of the scanner, because it is equiped with new lens mounting, which enables a quick sharpness adjustment.
For that, the scanner scans permanently a target film, and will show the sharpness level in the middle of film. The user will be brought to adjust the main lens through a big nut to increase the sharpness level.
If the sharpness is insufficient at this stage, the next test will not work.

2. Test conditions.

This test relates to the 135 Film carrier inserted in the scanner.
The 135 Film carrier must be inserted in the scanner to carry out this test.
The 135 BW Focus Tuning Film must be used for this test :
The acceptance of the test is automatic.
No parameter is saved.

3. Pre-requirements.

• The scanner must be equiped with the new adjustable lens mounting. If it is not the case, use the 135 Sharpness CoeffG test.
• Main lens mechanially pre-adjusted regarding L and S values.
• Top and bottom screws of 135 gate mechanically adjusted to default position (17.7mm).

4. Test realisation.

Click on RUN to launch the test. A message will appear asking to enter the theoritical size of the image (written down by hand on the film, about 2200). When it is done, click on OK. A message will be displayed requiring the insertion of the 135 BW Focus Tuning film. When the film is inserted (caution watch for the direction of film), click on OK. Another message appears asking to "force calibration ?". Click on No (see troobleshooting section for this option, important in case of problem).

The useful part of this film is in the center of the image, where there is in the middle, the top and bottom, 9 black lines. These targets will be used to calculate the coeffG and Sharpness values.

The scanner will take the film until the beginning of the film is detected by the CCD. Then the film will progress slowly until the CCD detects the targets.
At this point, the film will not move any more, and the scanner will do continuous acquisitions on this target. An orange curve is the result of these acquisitions, displayed in the graph window : X axis is the coeffG position (the center of the X axis is the expected coeffG, size of the X axis is 60 pixels). Y axis is the sharpness value (the higher it is, the more sharpen it is). The blue curve represents the current position.

Turn the lens big nut up and down to scroll the complete X axis (don't leave any blank point). The result should be a curve that represents a kind of bell. Then move onto the position where the sharpness is the maximum. Then click on Abort.

To increase the CoeffG (move current position to the right), turn the nut up. To decrease the CoeffG (move current position to the left), turn the nut down).

5. Test acceptation.

When the Abort button is clicked, the software will calculate the maximum sharpness value and its coeffG position.
The test is then accepted if :

6. Other affected tests.

If the sharpness is not sufficient at this stage, the following test could not correctly be made :

• 135 Cal RGB-IR.

7. Trouble shooting.

If the target can not be found after film insertion : abort the test, run the test again and when the question "force calibration ?" appears, click on Yes. This will recalibrate the V-offset that has maybe changed because of lens / spacers / gate screws modification. Then, the target should be found correctly.

If the test is rejected with the message "Rejected, need sharpness adjustment" : this means that the current position is too far from the maximum sharpness position. Re-run the test and turn the lens nut up or down to place the current position near the maximum sharpness position.

If the maximum of the bell can not be seen on the graph : this means that the mechanical pre-adjustments of the lens, camera spacer and top/bottom screws are not good.