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Excessive Shadow

O-ring with excessive shadow from oblique lighting Bad example

The photograph contains excessive shadow due to oblique lighting

O-ring with diffuse lighting and no shadow Good example

The photograph is taken with diffuse lighting and the o-ring is not partially obscured by shadow

Lack of Focus

O-ring photograph taken too close, out of focus Bad example

The photograph is taken too close to the o-ring, and the camera is unable to focus

O-ring photograph taken at correct distance with good focus Good example

For small o-rings, taking the picture from further out to achieve focus is required

Perspective Skew

Grid photographed at an angle causing perspective skew Bad example

The camera is not perpendicular to the plane of the grid

Grid photographed perpendicular with minimal skew Good example

The camera is approximately perpendicular to the grid, there is minimal perspective skewing

Too Far

O-ring too small in the photograph Bad example

The o-ring is too small in the photograph (this is acceptable for small o-rings where it is required to achieve focus)

O-ring correctly sized in the photograph Good example

The o-ring is taking up the correct amount of space in the photograph

Off-center

O-ring not centered in the photograph Bad example

The o-ring is not centered in the photograph

O-ring correctly centered in the photograph Good example

The o-ring is approximately at the center of the photograph

Incorrect Grid

O-ring too large for the grid being used Bad example

The o-ring is too large for the grid

Correct A3 grid size used for the o-ring Good example

The correct size (A3) grid is used

Rotation

Grid not aligned with the vertical direction Bad example

The grid is not aligned with the vertical direction of the photograph

Grid correctly aligned with the vertical direction Good example

The grid is correctly aligned with the vertical direction of the photograph

Obstruction

Photograph contains debris and other artefacts Bad example

The photograph contains debris or other artefacts that are not the grid or the o-ring

Clean photograph with only the grid and o-ring Good example

There are no other items in the photograph