#' Indexing of photography filters
#'
#' Vectors of names of member objects with spectral data for filters intended to
#' be used on camera lenses, grouped by supplier. Suppliers: B+W, Formatt-Hitech
#' (Hitech, Firecrest), Fotga, Haida, Heliopan, Hoya, Ken & Faith Concept,
#' KinghtX, KolariVision, Purshee, Rocolax, Tangsinuo, Tiffen, UVRoptics, Zeiss,
#' and Zomei.
#'
#' @section Warning!: Data are to be used as \emph{"reference values only"} as
#' actual transmittance may change in time and with production batch or glass
#' melt. In some cases spectra for multiple filters of the same brand and type
#' are included and show such variation. In other words, these spectra are
#' measured in individual filters, other filters of the same type and brand
#' will almost surely differ to some extent in their spectra.
#'
#' The dynamic range of the data depends on the instrument used for the
#' measurements. Most of the photography filters have been measured with an
#' Agilent 8453 array spectrophotometer. The noise floor is at approximately
#' 3.5 to 4.0 absorbance units within the range of wavelengths included in the
#' data. Some small apparent "leaks" maybe only noise. A blank and a dark
#' measurement obtained using this instrument are also included in the data
#' set for comparison.
#'
#' The variables are as follows:
#'
#' \itemize{ \item w.length (nm) \item Tfr (fraction) }
#'
#' @section Supplier's web sites, if known:
#' \url{https://www.baader-planetarium.com/en/},
#' \url{https://www.formatt-hitech.com/},
#' \url{https://www.fotga.com/},
#' \url{https://www.haidaphoto.com/en/},
#' \url{http://www.heliopan.de/},
#' \url{https://hoyafilter.com/},
#' \url{https://kenkoglobal.com/},
#' \url{https://www.kentfaith.com/},
#' \url{https://knightx-photography.aliexpress.com/store/924165},
#' \url{https://kolarivision.com/},
#' \url{https://purshee.aliexpress.com/store/1996249},
#' \url{https://schneiderkreuznach.com/en/photo-optics/b-w-filters/filtertypes},
#' \url{https://tangsinuo.aliexpress.com/store/4314008},
#' \url{https://tiffen.com/},
#' \url{https://www.uvroptics.com/},
#' \url{https://www.zomei.com/}.
#'
#' @docType data
#' @keywords datasets
#' @format A vector of character strings.
#'
#' @note Data measured with an Agilent 8453 spectrophotometer (based on diode
#' array).
#'
#' @note Idependent measurement of a single sample, not a specification.
#'
#' @examples
#' photography_filters
#'
"photography_filters"
#' @rdname photography_filters
#'
"hoya_filters"
#' @rdname photography_filters
#'
"firecrest_filters"
#' @rdname photography_filters
#'
"haida_filters"
#' @rdname photography_filters
#'
"zomei_filters"
#' @rdname photography_filters
#'
"fake_unbranded_filters"
#' @rdname photography_filters
#'
"baader_filters"
#' @rdname photography_filters
#'
"uvroptics_filters"
#' @rdname photography_filters
#'
"tiffen_filters"
#' @rdname photography_filters
#'
"bw_filters"
#' @rdname photography_filters
#'
"heliopan_filters"
#' @rdname photography_filters
#'
"zeiss_filters"
#' @rdname photography_filters
#'
"kenko_filters"
#' @rdname photography_filters
#'
"rocolax_filters"
#' @rdname photography_filters
#'
"kolarivision_filters"
#' @rdname photography_filters
#'
"fotga_filters"
#' @rdname photography_filters
#'
"tangsinuo_filters"
#' @rdname photography_filters
#'
"purshee_filters"
#' @rdname photography_filters
#'
"knightx_filters"
#' @rdname photography_filters
#'
"kenfaith_filters"
#' @rdname photography_filters
#'
"nisi_filters"
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