Magnetic custom branding area
The chart can be customized to make it fully yours.
Add a fullcolor printed magnet with your logo or any special information : for exemple an event, an open day, etc …
Magnetic writable areas
Write the useful and indispensable technical informations on the magnetic writable and erasable annotations areas. You don’t write on the chart but on the dedicated positionable magnetic areas. This extra tool protect the entire chart against time.
40 € / area
CHOOSE THE WRITABLE AREAS YOU NEED FOR EACH OF YOUR CHARTS.
Magnetic optical wedge scale
The optical wedge scale allows to evaluate and quantify the sharpness of spherical lenses. It gives a mathematical data of the sharpness to help the technical exchanges between users, like camera assistants, and camera technicians.
Find the optical wedge sheet corresponding to the lens on test.
Write the informations about the lens on test in the corresponding areas : brand, serial number, focal, stop.
Place the camera from the P.A.T. chart at the distance advocated by the optical wedge sheet (approximately 50 times the focal lengh of the lens).
4/ Stick the center of a self-adhesive graph paper on the engraving fixed mark of the lens.
a/ Write in the «Ratio» area the ratio corresponding to the lens. The ratio depends on the gap between focus engravings. It has to be multiplied with the measurement unit of the scale (mm).
b/ Millimeter is the measurement unit of the scale. It goes from -5 mm to + 5 mm and corresponds to the variation of the lens ring in the minus or in the plus directions around the correct testing distance of the lens.
For exemple : if the ratio is 3, then -5 mm becomes -15 mm, -4 becomes -12 mm, -3 mm becomes -9 mm, etc.
Write in the «eye» area (useful for camera films to calibrate the viewfinder) the best focus reading.
Record or print a few frames of each variation of the lens ring, using the ratio multiplied with the mm, from the minus to the plus.
With digital cameras, play your recording and find easily the best result.
With film cameras, analyse the picture frames with a microscope to find the best result.
You have the possibility to add a ColorChecker Classic® using the Velcro® pads in the middle of the chart without removing it from the wall.
Mirror centering aid
Here is a very smart and useful aid to win time on your camera tests !
The mirror helps to place the chart perfectly parallel to the image plan in a matter of seconds.
USER MODE :
- Place the magnetic mirror on the center of the chart by using the 4 discreet magnets.
- Place the camera at the rough required distance from the chart.
- Move the camera legs, pan and tilt to film the center of the lens mirror relection.
- Doing this, the optical axis becomes perfectly perpendicular to the chart. Because you film the center of the chart, the sensor is equidistant about its 4 corners.
- Finally, adjust precisely the distance using the sliding plate.
You have the possibility to add a very useful bubble level on the top of the chart.