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filter

Filter

Nachfolgend sind detaillierte Informationen der zur Verfügung stehenden Filter aufgeführt.

Astrodon Photometrics Johnson-Cousins Filters

Für die Photometrie sind Johnson-Cousins Filter vorhanden (seit Dezember 2018). Es steht auch ein Klar-Filter zur Verfügung.

Die nachfolgenden Informationen sind der Seite https://farpointastro.com/ entnommen.

  • Spectral profiles designed after UV, B, V, Rc, Ic Johnson/Cousins
  • Improved B filter extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters
  • 100% coated – no colored glass
  • Peak transmission guaranteed > 90%
  • <0.01%T(ave) typical out-of-band 300 – 1100 nm; additionally =<0.1% Tabs for B***
  • Striae-free, single fused silica substrates
  • 1/4-wave propagated wavefront prior to coating
  • <0.5 arcminute substrate parallelism
  • 3.000 +/-0.025 mm substrate thickness
  • Parfocal with all Astrodon filters
  • Edge-blackened
  • 1.25″ mounted
  • Substrate: 3.0mm +/-0.025mm fused silica
  • Filter Size: 25.4mm +/-0.1mm diameter
  • Clear Aperture: Central 23.4mm diameter minimum
  • TWF: </= 1/4 lambda per any 25mm square area before coating
  • Parallelism: </=0.5 arcminute before coating
  • Coating: To edge of part
  • AOI: 0 degree
  • Scratches: </= 0.06mm width; no limit on length
  • Particles/Bubbles: </= 0.4mm dia.
  • Pinholes/Voids: </= 0.2mm dia.
  • Edge Finish: As fabricated
  • Chips: </=0.5mm
  • Edge Treatment: Edges blackened with Enthone M-0-N black epoxy ink.
  • Thickness </= 0.1mm. It may extend 0.5mm onto top and bottom surfaces.

JOHNSON-COUSINS B∗∗∗

  • T = 50%: 377.0 nm +/- 5.7nm; T = 50%: 473.0 nm +/- 3.8 nm
  • 365 nm – 525 nm: match target curve by design – will not evaluate
  • 410 nm – 425 nm: Tmin >= 90%
  • 300 nm – 350 nm: Tave ⇐0.01%; 550 nm – 1100 nm: Tave ⇐0.01%; 560 nm – 1000 nm: Tabs ⇐0.1%
  • Back reflections with theoretical values < 0.4% average by design.Listenpunkt

JOHNSON-COUSINS V∗

  • T = 50%: 490.0 nm +/- 7.3nm; T = 50%: 589.2 nm +/- 4.7 nm
  • 478 nm – 640 nm: match target curve by design, will not evaluate
  • 518 nm – 532 nm: Tmin >= 95%
  • 300 nm – 460 nm: Tave ⇐0.01%; 670 nm – 1050 nm: Tave ⇐0.01%
  • Coating has been redesigned to minimize back reflections with theoretical values < 0.3% average.

JOHNSON-COUSINS Rc

  • T = 50%: 567.3 nm +/- 8.5nm; T = 50%: 717.1 nm +/- 5.7 nm
  • 550 nm – 850 nm: match target curve by design – will not evaluate
  • 594 nm – 615 nm: Tmin >= 95%; 300 nm – 525 nm: Tave ⇐0.01%
  • 900 nm – 1050 nm: Tave ⇐0.01%; 860 nm – 900 nm: Tave ⇐ 1.0%

JOHNSON-COUSINS Ic

  • T = 50%: 721.8 nm +/- 10.8nm; T = 50%: 889.8 nm +/- 7.1 nm
  • 705 nm – 900 nm: match target curve by design – will not evaluate
  • 758 nm – 850 nm: Tmin >= 95%
  • 300 nm – 680 nm: Tave ⇐0.01%; 930 nm – 1050 nm: Tave ⇐0.01%

BAADER Filter

Astronomik Filter

filter.txt · Zuletzt geändert: 2020/11/22 17:19 (Externe Bearbeitung)