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The Cluster Lensing And Supernovae survey with Hubble (CLASH) is an HubbleSpace Telescope (HST) Multi-Cycle Treasury program observing 25 massive galaxyclusters. CLASH observations are carried out in 16 bands from UV to NIR toderive accurate and reliable estimates of photometric redshifts. We present theCLASH photometric redshifts and study the photometric redshift accuracy of thearcs in more detail for the case of MACS1206.2-0847. We use the publiclyavailable Le Phare and BPZ photometric redshift codes on 17 CLASH galaxyclusters. Using Le Phare code for objects with StoN>=10, we reach a precisionof 3%(1+z) for the strong lensing arcs, which is reduced to 2.4%(1+z) afterremoving outliers. For galaxies in the cluster field the corresponding valuesare 4%(1+z) and 3%(1+z). Using mock galaxy catalogues, we show that 3%(1+z)precision is what one would expect from the CLASH photometry when taking intoaccount extinction from dust, emission lines and the finite range of SEDsincluded in the photo-z template library. We study photo-z results fordifferent aperture photometry and find that the SExtractor isophotal photometryworks best. Le Phare and BPZ give similar photo-z results for the stronglensing arcs as well as galaxies of the cluster field. Results are improvedwhen optimizing the photometric aperture shape showing an optimal aperture sizearound 1" radius giving results which are equivalent to isophotal photometry.Tailored photometry of the arcs improve the photo-z results.

CLASH: Photometric redshifts with 16 HST bands in galaxy cluster fields