01 / MAGNIFICATION
Magnification
The “1–5×” in 1–5×24 describes variable magnification from 1× to 5×. Check the model name and specifications for each range.
02 / OBJECTIVE LENS
Objective lens diameter
The “24” in 1–5×24 describes a 24 mm objective lens. This lineup includes 24, 28, 32, 40, 50 and 56 mm objective models.
03 / TUBE DIAMETER
Tube and housing diameters
Tube diameter is the diameter of the scope body. It is a different measurement from objective lens diameter or objective housing diameter, so these are listed separately.
04 / FOCAL PLANE
SFP / FFP
SFP means second focal plane; FFP means first focal plane. An SFP reticle keeps the same apparent size as magnification changes. An FFP reticle changes apparent size along with the image.