a drizzling technique implemented in ‘dither’ package in STSDAS, running in the IRAF environment (Fruchter, Hook 2002). The depths for both images are 26.3 and 26.6 ST-mag($R_{\rm{{ST}}}$)(assuming 2” diameter aperture with 2$\sigma$ detection), respectively.

### Optical imaging with Subaru Telescope

Optical imaging using Kron–Cousin’s $R_{\rm{c}}$ and $I_{\rm{c}}$ band filters for complementing WFPC2 data were performed for MS $0451.6-0305$ using the Faint Object Camera and Spectrograph(FOCAS)(Kashikawa et al. 2002) at the Cassegrain focus of Subaru Telescope on 2000 December 29, during a commissioning observation run of FOCAS. Johnson $B$ and SDSS $z'$ imaging observations were performed on 2002 November 1 and 2, using Subaru Prime Focus Camera(SuprimeCam) (Miyazaki et al. 2002) attached to the prime focus of the Subaru telescope. All these images, except for $z'$-band image, were taken under good photometric conditions. The total exposure times were 3600, 1800, 1800 and 2940 s for the $B$, $R_{\rm{c}}$, $I_{\rm{c}}$ and $z'$-bands, respectively. We applied the standard calibration for these data using IRAF tasks for the FOCAS data, and the software package for SuprimeCam data (Yagi et al. 2002). Photometric calibrations were performed using “RUBIN 152” in Landolt’s standard stars catalog (Landolt 1992) for the FOCAS data, and SA 95 for the 