This article [J. Astron. Telesc. Instrum. Syst. 6(3), 035005 (Sep 24, 2020) DOI: 10.1117/1.JATIS.6.3.035005] as originally published omitted three authors as well as three references. The omitted... Show moreThis article [J. Astron. Telesc. Instrum. Syst. 6(3), 035005 (Sep 24, 2020) DOI: 10.1117/1.JATIS.6.3.035005] as originally published omitted three authors as well as three references. The omitted authors produced the Apodizing Phase Plate design used in the paper’s end-to-end simulations. This contribution was provided by David Doelman, Emiel Por, and Frans Snik, all of Leiden University. They have been added as authors on the paper, as listed above.The following acknowledgment also has been added to the published paper:“The research of DD and FS leading to these results has received funding from the European Research Council under ERC Starting Grant agreement 678194 (FALCONER).”Additionally, three references were omitted from the paper when it was published. They are listed below:61. G. Otten et al., “Performance characterization of a broadband vector Apodizing Phase Plate coronagraph,” Opt. Express 22(24), 30287 (2014).62. G. Otten et al., “The vector apodizing phase plate coronagraph: prototyping, characterization and outlook,” Proc. SPIE 9151, 91511R (2014).63. E. Por, “Optimal design of apodizing phase plate coronagraphs,” Proc. SPIE 10400, 104000V (2017).All versions of the article were corrected on 15 October 2020. The article appears correctly in print. Show less
Spectropolarimetry is a powerful technique for remote sensing of the environment. It enables the retrieval of particle shape and size distributions in air and water to an extent that traditional... Show moreSpectropolarimetry is a powerful technique for remote sensing of the environment. It enables the retrieval of particle shape and size distributions in air and water to an extent that traditional spectroscopy cannot. SPEX is an instrument concept for spectropolarimetry through spectral modulation, providing snapshot, and hence accurate, hyperspectral intensity and degree and angle of linear polarization. Successful SPEX instruments have included groundSPEX and SPEX airborne, which both measure aerosol optical thickness with high precision, and soon SPEXone, which will fly on PACE. Here, we present a low-cost variant for consumer cameras, iSPEX 2, with universal smartphone support. Smartphones enable citizen science measurements which are significantly more scaleable, in space and time, than professional instruments. Universal smartphone support is achieved through a modular hardware design and SPECTACLE data processing. iSPEX 2 will be manufactured through injection molding and 3D printing. A smartphone app for data acquisition and processing is in active development. Production, calibration, and validation will commence in the summer of 2020. Scientific applications will include citizen science measurements of aerosol optical thickness and surface water reflectance, as well as low-cost laboratory and portable spectroscopy. Show less
