Transmission data for the KPNO Mosaic Rhoads 820B (aka 815) filter (k1026)


Below is the transmission curve for this filter in parallel light.

Note that there is a shift in central wavelength when placed in different f/ratio beams. At the KPNO 4meter f/3.1 beam this corresponds to a shift of approximately 12 Angstroms bluer; at the CTIO 4meter f/2.9 this corresponds to a shift of approximately 15 Angstroms bluer; at the WIYN 0.9m f/7.9 this corresponds to a shift of approximately 5 Angstroms bluer. See the plot at the bottom of the page.

Note:In December 2003 a replacement for this filter (k1046) was purchased. See below for a comparison between the two filters.

Click here to get the ASCII version of the above plot.
Click here to get the Postscript version of the above plot.

Click here to get the ASCII version of the above plot.
Click here to get the Postscript version of the above plot.


A comparison of this filter with the newer version of this filter (k1046):



Below is a plot of the transmission of this filter when used at telescopes with differing focal ratios and central obscurations; the KPNO 4m (f/3.1) and the CTIO 4m (f/2.9). At the KPNO 4m f/3.1 the properties of this filter are:
CWL=8087A, FWHM=71A, PEAK TRANSMISSION=93%.

Click here for the ASCII version of the simulation data used in the above plot.
Click here for a postscript version of the above plot.


Last updated December 21, 2004 by Heidi Schweiker