Abstract: For wide field telescopes with small focal ratios, the performance of narrow-band filters is significantly affected by the deflection of the light incident angle. From the center to the edges of the field of view, the deflection of the incident angle gradually increases, resulting in a blue shift of the central wavelength of the narrow-band filter, a broadening of the bandpass, and an attenuation of the maximum transmittance. For planned imaging with WFST (Wide Field Survey Telescope) and MASTA (Multi-Application Survey Telescope Array), we analyze the changes in the central wavelength and bandpass of different narrowband filters with the radius of the field of view. The focal ratio of WFST is F/2.49, and the maximum off-axis incident angle is 13.27^\circ. At the maximum deflection, the central wavelength of the narrowband filters at 395 nm (656 nm) is blue-shifted by 0.78\%, and the broadening of the 10 nm and 1 nm bandpasses will reach 2.67\% (41.80\%), and the maximum transmittance attenuation is 80.00\% (74.50\%). The focal ratio of the MASTA telescope is F/1.74, and the maximum off-axis incident angle is 18.48°. At the maximum deflection, the central wavelength at 395 nm (656 nm) exhibits a blue shift of 2.70\%, the broadening of the 10 nm (1 nm) bandpasses will reach 4.20\% (81.70\%), and the maximum transmittance attenuation coefficients will be 80.00\% and 63.90 \%, respectively. In the future, narrow-band imaging observations with WFST and MASTA need to take into account the effects of central wavelength blue shift and bandpass broadening.