In this study, we report an improved hand-held full-field optical coherence tomography (FFOCT) system based on a combination of double interferometers. The system uses a Fizeau interferometer for detection and a Michelson interferometer for compensation. The initial system was modified by the addition of a plane mirror to alter its optical path and to make it easier to arrange samples horizontally. The analysis was conducted on how the system's imaging quality and compensation distance were affected by the angle deviation between the mirror and other key components of the system. The obtained results are useful for the design and optimization of the hand-held FFOCT system.