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We present fitted UBVRI-ZY and u'g'r'i'z' magnitudes, spectral types anddistances for 2.4M stars, derived from synthetic photometry of a libraryspectrum that best matches the Tycho2 BtVt, NOMAD Rn and 2MASS JHK_{2/S}catalog magnitudes. We present similarly synthesized multi-filter magnitudes,types and distances for 4.8M stars with 2MASS and SDSS photometry to g<16within the Sloan survey region, for Landolt and Sloan primary standards, andfor Sloan Northern (PT) and Southern secondary standards.  The synthetic magnitude zeropoints for BtVt, UBVRI, ZvYv, JHK_{2/S},JHK_{MKO}, Stromgren uvby, Sloan u'g'r'i'z' and ugriz are calibrated on 20calspec spectrophotometric standards. The UBVRI and ugriz zeropoints havedispersions of 1--3%, for standards covering a range of color from -0.3 < V-I <4.6; those for other filters are in the range 2--5%.  The spectrally matched fits to Tycho2 stars provide estimated 1-sigma errorsper star of ~0.2, 0.15, 0.12, 0.10 and 0.08 mags respectively in either UBVRIor u'g'r'i'z'; those for at least 70% of the SDSS survey region to g<16 haveestimated 1-sigma errors per star of ~0.2, 0.06, 0.04, 0.04, 0.05 in u'g'r'i'z'or UBVRI.  The density of Tycho2 stars, averaging about 60 stars per square degree,provides sufficient stars to enable automatic flux calibrations for mostdigital images with fields of view of 0.5 degree or more. Using several suchstandards per field, automatic flux calibration can be achieved to a fewpercent in any filter, at any airmass, in most workable observing conditions,to facilitate inter-comparison of data from different sites, telescopes andinstruments.

All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog