MEGA CHART 27 X 38 CM

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BOX CONTENTS

The Mega chart by P.A.T. Accessories has been specially made to calibrate cameras and lenses that become increasingly technical and sensitive, 8k and over. Specially thought for users, it has all the main features in a comfortable size to help you check the sharpness of your lens and your camera, in a studio or on the field.

All you need to calibrate your camera and your lenses is now in one box.

Chart 27×38 cm / 1’3’’x11’’
Magnetized plexiglass support. Thickness 4 mm.

Aluminium bracket with 3x 1/4’’-20 nut.

2x 1/4’’-20 thumb screws.

Wotersoluble pen

Universal adaptor 1/4’’M – 3/8’’M

PU storage bag

TECHNICAL CHARACTERISTICS

Dimensions 27×38 cm thought for field use

Circular targets

Until 250 pairs of lines printed on the sensor

Linear targets

Anti-bending support

Siemens targets

Magnetic support

Neutral grey

Aluminium bracket to mount the chart on a stand

Writable annotation areas

Mate coating

Fits in cabin baggage for air travel

INSTRUCTIONS FOR CHART INSTALLATION

Place the chart in horizontal position.
2 options :

The chart can be mounted on a metallic surface
(iron, steel, etc.) due to magnetized backing.

Slide the chart inside the slot of the bracket
and lock it with the 2 thumb screws.
Mount it on a stand (not supplied)
using the 1/4’’ nut below.

INSTRUCTIONS

Frame the center of the chart. The optical axis
has to be perpendicular to the chart, so the chart
is parallel to the image plane.

SHARPNESS TEST

The P.A.T. charts give you the possibility to check mathematically the resolution of your sensor or your lens.
For this mode, use the numbers of each circular and linear targets.

The numbers in the concentric and linear targets, in twentieth of a millimeter,
express the number of pairs of lines printed on 1 mm.

Adjust the position of the camera using the mirror centering aid.

The table below gives you the correlation between the numbers in the concentric and linear targets, the number of pairs of lines printed on the chart on 1 millimeter and the number of pairs of lines printed on the film or sensor on 1 millimeter.

To use this correlation table, place the chart at a distance from the image plane 50 times the focal lengh of the lens to be tested.

Example for a 50 mm lens :
50 x 50 = 2500 mm = 2,5 meters = 8 feet

Analyse your lenses and print them with stop wide open.

The degree of sharpness depends on the clarity between the lines. The resolving power depends on the number of lines seen.

CORRELATION TABLE