Sigma SD1 Merrill
Response
- red (R)
- green (G)
- blue (B)
Astro mode
Emission-line overlay on the active single-profile plot. Values are the source's own native samples (or a labelled linear interpolation).
About this spectrum4 notes
- Warning: Response scope is unknown; do not interpret this response as a bare-sensor measurement. Dataset interpretation
- Warning: Physical configuration is not documented; the response cannot be assigned to a confirmed optical configuration. Dataset interpretation
- Warning: Normalization is unknown; amplitude comparisons are not established. Dataset interpretation
- Warning: Uncertainty is not documented. Missing uncertainty does not mean zero uncertainty. Dataset interpretation
Source & details
- Source category: measured
- Primary measurement: a direct laboratory observation (or community submission recorded as measured). Not a mirror, not an estimation.
- Type: measured
- Measured response; measurement alone does not establish quality or confidence.
- Origin: Community
- Community provenance; origin does not establish measurement type, quality or confidence.
- Quality: unassessed
- Quality has not been assessed; no grade is inferred. Canonical release: no per-leaf scientific-quality assessment is asserted; the source-side claim is preserved verbatim.
- Confidence: unassessed
- Confidence has not been assessed; no confidence level is inferred. Canonical release: no claim about the per-leaf measurement precision is asserted; the upstream 'as is' wording (where present) is preserved.
- Author
- Darrodi et al.
- Source
- NPL-measured ground-truth spectral sensitivity for the Sigma SD1 Merrill (Darrodi et al. 2015). (link)
- Source category
measured(primary measurement; not a mirror or estimation)- Methodology
- NPL ground-truth spectrally-resolved measurement, narrower range (400-680 nm @ 10 nm).
- As-is
- Samples rendered verbatim: no smoothing, no interpolation, no zero-padding, no gap bridging in the browser. Documented null sparse cells render as visible gaps.
- Optical configuration
cfg-prf-npl-sigma-sigma-sd1-merrill-col-abcd(unknown) — unknown- Normalisation
- unknown (original: unknown)
- Response unit / scale
unknown/unknown- Sample count
- 29 samples from 400–680 nm, Δ 10 nm
- Profile ID
prf-npl-sigma-sigma-sd1-merrill-col-abcd@1- Profile checksum
sha256:4b60156b28d26253…- Processing
- source_column=A:D
- Scientific notes
- Canonical release: native grid and native R/G/B samples are preserved verbatim; sparse cells (wavelengths absent in the upstream CSV / JSON) are preserved as null; the parser never invents a value.
- Citation
- Darrodi et al. 2015, NPL-measured ground-truth sensitivity for the Sigma SD1 Merrill.
- Known limitations
- source_category=measured
- permission_status is 'unknown' on the canonical License record (no independent operational clearance granted).
Graph tools
Inspect, zoom, export, and share the current chart. Native samples only — no interpolation, no averaging.
Channels
Zoom (nm)
Camera specifications
- Sensor type
- Foveon
- Sensor format
- APS-C
- Sensor size
- 24 x 16 mm
- Effective megapixels
- 15.4 MP
- Resolution
- Unknown
- Lens mount
- Sigma SA mount
- Release year
- 2012
Specification sources
Body specifications drawn from cited reference sources, distinct from the measured spectral response curves below.
Source: Dataset commit 374a630bac7847f851b3746e82aa528262ef0b5c Dataset: CameraDatabase (unknown); Wikipedia infobox MediaWiki revision 1368901055 (CC BY-SA 4.0)
Data details
- Dataset version
recovered-2026-10-01-siril-source-review-v2- Manifest digest
6493790d2d6b6b68…- Manifest schema
0.1.0-draft- Release kind
full- Linked profiles / sessions
- 1 profile revision
Raw samples (R/G/B at native wavelengths)
prf-npl-sigma-sigma-sd1-merrill-col-abcd(revision 1)Raw samples for prf-npl-sigma-sigma-sd1-merrill-col-abcd (revision 1): R/G/B response at native wavelengths. λ (nm) R G B 400 0.005621074406087 0.00632809751263117 0.162159424133079 410 0.00650335624511722 0.00976180459591275 0.285498378046286 420 0.0740791128914004 0.0252717700826105 0.396904310609021 430 0.0430229594629288 0.0837511858531122 0.508310243171756 440 0.0345095256224701 0.14370381974361 0.622118472469488 450 0.0188915672343435 0.183611689308822 0.737421362457695 460 0.007311076996802 0.40909478009953 0.94538036670138 470 0.0454991512309602 0.515955640861764 0.964414947702804 480 0.0567675292111168 0.601206646627055 1 490 0.134195920659178 0.670316799801363 0.985980211884525 500 0.164752689978376 0.752587471534758 0.98340266357529 510 0.217126419786392 0.843813843689442 0.969692195670726 520 0.306483438358244 0.901517245588127 0.942808174020798 530 0.349845796148885 0.919750306687677 0.896642799180709 540 0.443742581332593 0.967994290521578 0.884445902200419 550 0.444888605281263 0.957252310640411 0.867918990715971 560 0.478975756747026 0.952047918600474 0.833756795849084 570 0.509502914810739 0.976280144583998 0.83204140240573 580 0.592629093785305 0.972586243889558 0.800549563847782 590 0.673833275606976 1 0.782895124746465 600 0.714037714881065 0.969484527577774 0.739469530071918 610 0.860007613114951 0.954413191248507 0.667186401749857 620 0.898103028495652 0.933354358909213 0.620436278068167 630 1 0.925714068336362 0.611160878769567 640 0.994942133112452 0.884864395415034 0.551735561957106 650 0.92085127736138 0.761651847416157 0.465388317445164 660 0.181433116314253 0.140524370571505 0.0796190783672069 670 0.0063097879537275 0.00414367215817646 0.000592444461072368 680 0.00528874383171553 0.00183198958165669 0.00468563680483141