Editing Image intensifier (section)

===Resolution===
More accurately known as '''limiting resolution''', tube resolution is measured in line pairs per millimeter or lp/mm. This is a measure of how many lines of varying intensity (light to dark) can be resolved within a millimeter of screen area. However the limiting resolution itself is a measure of the Modulation Transfer Function. For most tubes, the limiting resolution is defined as the point at which the modulation transfer function becomes three percent or less. The higher the value, the higher the resolution of the tube.

An important consideration, however, is that this is based on the physical screen size in millimeters and is not proportional to the screen size. As such, an 18&nbsp;mm tube with a resolution of around 64 lp/mm has a higher overall resolution than an 8&nbsp;mm tube with 72 lp/mm resolution. Resolution is usually measured at the centre and at the edge of the screen and tubes often come with figures for both. Military Specification or [[milspec]] tubes only come with a criterion such as "> 64 lp/mm" or "Greater than 64 line pairs/millimeter".