A calibration sample for IMACS V band (top, blue circles) and I band (bottom, orange squares) to Stetson standards for a single, representative field. The final average magnitude offsets adopted are detailed in Table 1. Magnitude offsets are the instrumental magnitudes minus the corresponding Stetson photometry. The gray points are sources 2σ from the median and are excluded from the final offset mean value. A Gaussian kernel density estimate (KDE) of the sample is shown on the right. The photometric difference is plotted against IMACS (V − I) color on the bottom. A linear fit is applied to the data and the 68% confidence intervals are plotted. There is no evidence for a color term as the slopes of the fits are consistent with zero.