Method to control point spread function of an image

A method of controlling a point spread function of an object, said method comprising:

• determining at least one characteristic of an optical component of a projection system, said projection system operable to project an image onto an image layer;
• determining a distance from an origin of said object to a first position based upon said at least one characteristic;
• and
• positioning said optical component at said first position for controlling said point spread function of said object and further wherein said position reduces Moiré interference without over-blurring said image.

A method of controlling a point spread function of an object, said method comprising:

• determining at least one characteristic of an optical component of a projection system, said projection system operable to project an image onto an image layer;
• determining a distance from an origin of said object to a first position based upon said at least one characteristic;
• positioning said optical component at said first position for controlling said point spread function of said object;
• adjusting said at least one characteristic of said optical component;
• and
• re-positioning said optical component at a second position based upon a second value of said at least one characteristic for further controlling said point spread function of said object.