astropy/astropy — pull request #2360 by mdboom (2014-04-23 17:46:02+00:00)
Title: Fix sip_pix2foc and sip_foc2pix

The focal plane should be offset by crpix, but it wasn't (because we were preparing for its subsequent input to wcslib -- however, the standalone sip_pix2foc shouldn't do that).

@nden