  Surveys of the distant Universe have been made using the SCUBA
submillimeter(submm)-wave camera at the JCMT. 450- and 850-micron data is taken
simultaneously by SCUBA in the same 5-square-arcmin field. Deep 850-micron
counts of high-redshift dusty galaxies have been published; however, at 450
microns both the atmospheric transmission and antenna efficiency are lower, and
the atmospheric noise is higher, and so only upper limits to the 450-micron
counts have been reported so far. Here we apply the methods used by Blain et
al. (1999) to derive deep 850-micron counts from SCUBA images of lensing
clusters to the 450-micron images that were obtained in parallel, in which four
sources were detected. We present the first 450-micron galaxy count. This
analysis has only just become possible because the volume of data and the
difficulty of calibration are both greater for the 450-micron array. In light
of recent work, in which the identification of two of the galaxies in our
sample was clarified, we also update our deep 850-micron counts.
