IR/F125W Description Wide J filter. Figure A.196: Integrated system throughput for F125W. Figure A.197: Point source S/N vs. V+ABν for the F125W filter, assuming high sky backgrounds and a 3×3 pixel aperture. Figure A.198: Extended source S/N vs. V+ABν for the F125W filter, assuming high sky backgrounds and a source uniformly filling a 1 arcsec2 aperture.