Although the FFP marking design is far superior to the SFP design, the cost is much higher. Therefore, only high-end scopes on the market will usually use the FFP design. Moreover, the FFP marking line will become too thick or too thin after being synchronized and enlarged, which may affect the aiming. If you do not use graduated markings, or use a fixed power of the scope, then the FFP design has no advantage at all.

Marking Illumination

If you shoot in low light (such as hunting animals that only come out during the short period of dawn and evening) or the background light is too strong, it often happens that the contrast is too dark to see the markings. In order to cope with this situation, some scopes have a reticle illumination function, that is, an additional light source is set in the mirror to illuminate the reticle to increase the amount of light reflected. The marking illumination design can be light from the outside with optical fiber or radioisotope (usually tritium), but most of the products on the market still use battery-powered light-emitting diodes (LED) to provide the light source.

Because the marking line illumination may produce vignetting on the retina under low light conditions, or because it is too bright than the background, the pupils shrink and the surrounding environment cannot be seen clearly, so generally only weak red illumination is used (red has the least impact on the pupil) .