Хрома Ha SII OIII(5nm) узкополосный фильтр - 36 мм круглый немонтированный для астрофотографии на CCD.

Хрома Ha SII OIII(5nm) узкополосный фильтр - 36 мм круглый немонтированный для астрофотографии на CCD.

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About this product                                                                                                  

Premium quality 5nm Ha Filter

Chroma 5nm H-alpha filters are essential for imaging nebulae and other objects which are rich in ionised hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).

Chroma Technology is an employee-owned company based in Vermont, USA. Chroma manufacture the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximise transmission. Chroma astronomical filters are used worldwide in research and amateur applications. 

Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

All filters may be used with focal ratios of f/4 or slower. For optics faster than f/4 then due to the spectral shift we recommend using the 5nm filters instead.

Manufacturer's number: 27002

FEATURES

• CWL: 656nm, Bandwidth: 5nm

• Durable sputter coatings

• Parallelism: <30 arcsec

• Thickness: 3.0 +/-0.05mm

• Filters designed for use with CCD and for f/4.0 or slower

• Transmitted wavefront better than 0.25 waves/inch

• No reflections leading to image distortions or ‘back reflections’

• 36mm round unmounted

Transmission Chart

Premium quality 5nm SII Narrowband Filter

Chroma SII filters isolate the spectral emission of singly ionised sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).

Chroma Technology is an employee-owned company based in Vermont, USA. Chroma manufacture the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximise transmission. Chroma astronomical filters are used worldwide in research and amateur applications. 

Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

All filters may be used with focal ratios of f/4 or slower. For optics faster than f/4 then due to the spectral shift we recommend using the 5nm filters instead.

Manufacturer's number: 27007

FEATURES

• CWL: 672.4nm, Bandwidth: 5nm

• Durable sputter coatings

• Parallelism: <30 arcsec

• Thickness: 3.0 +/-0.05mm

• Filters designed for use with CCD and for f/4.0 or slower

• Transmitted wavefront better than 0.25 waves/inch

• No reflections leading to image distortions or ‘back reflections’

• 36mm round unmounted

Transmission Chart

Premium quality 5nm OIII Narrowband Filter

Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulaeChroma Technology is an employee-owned company based in Vermont, USA. Chroma manufacture the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximise transmission. Chroma astronomical filters are used worldwide in research and amateur applications. 

Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

All filters may be used with focal ratios of f/4 or slower. For optics faster than f/4 then due to the spectral shift we recommend using the 5nm filters instead.

Manufacturer's number: 27010

FEATURES

• CWL: 500.7nm, Bandwidth: 5nm

• Durable sputter coatings

• Parallelism: <30 arcsec

• Thickness: 3.0 +/-0.05mm

• Filters designed for use with CCD and for f/4.0 or slower

• Transmitted wavefront better than 0.25 waves/inch

• No reflections leading to image distortions or ‘back reflections’

• 36mm round unmounted

Transmission Chart

Handle coated pieces by the edges only. Clean gently only if necessary. Loose particles should be removed with a bulb puffer or filtered, pressurised air cleaner. If necessary, gently wipe surface using anhydrous alcohol and lint-free lab towels. Use new surface of towel with each wipe.

• AVOID TOUCHING OR WIPING A/R COATED OR METAL MIRROR SURFACES

• AVOID HANDLING EXPOSED COATINGS WITH BARE FINGERS

Orientation Instructions

Proper orientation of the filter is necessary in order to minimise autofluorescence and maximise performance. There is a caret (arrow) located on the edge of each filter in order to aid orientation. Excitation (x) filters should be positioned with the arrow pointing toward the specimen, toward the inside of the cube, and away from the light source. Emission (m) filters should be placed with the arrow pointing toward the specimen, toward the inside of the cube, and away from the detector/eye. Dichroic mirrors should be mounted with the coated surface toward the light source, excitation filters, and the specimen. The dichroics either have an arrow on the side pointing to the coated side, or they are beveled on the coated side. The beveled side is the smaller surface.

Our shop is a Chroma certified authorized dealer

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  Andrea Ricciardi

  
  

  
  

  Veil Nebula

  Shot from the bad sky of the center of Rome, with some moon too...

  200mm f/4 newton

  Astrel Instruments AST8300B CCD camera

  
  

  
  
  

  FILTERS

  
  

  Chroma Technology 3nm spectral line filters: H-alpha, OIII and SII

  
  

  
  

  Technical Details 

  Captured and processed by: Terry Hancock 

  Location: GrandMesaObservatory.com Purdy Mesa, Colorado  

  Dates of Capture July 30, August 6th, 8th, 11th and 13th 2020  

  HA 210 min 21 x 600 sec  

  OIII 140 min 14 x 600  sec  

  RGB  165 min 11 x 300  sec (per channel)  

  Narrowband Filters by Optolong 

  Camera: QHY600 Monochrome CMOS Photographic version 

  Camera Details and Specs
  //www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=55 

  Gain 60, Offset 76 in Read Mode Photographic 16 bit 

  Calibrated with dark, Bias and Flat Frames 

  Optics: Walter Holloway's Takahashi FSQ 130 APO Refractor @ F5 

  Image Scale: 1.19 arcsec/pix 

  Field of View: 3d 7' 41.0" x 2d 3' 5.3 (127.3 x 190.1
  arcmin) 

  EQ Mount: Paramount ME  

  Image Acquisition software Maxim DL6 Pre Processing in Pixinsight
  Post Processed in Photoshop CC 

  
  

  
  

  Captured and processed by: Terry Hancock 

  Location: GrandMesaObservatory.com Purdy Mesa, Colorado  

  HA 210 min 21 x 600 sec  

  OIII 280 min 28 x 600  sec  

  SII 210 min 21 x 600 sec   

  Narrowband Filters by Chroma  

  Camera: QHY600 Monochrome CMOS Photographic version  

  Gain 60, Offset 76 in Read Mode Photographic 16 bit  

  Calibrated with Dark, Bias and Flat Frames  

  Optics: Walter Holloway's Takahashi FSQ 130 APO Refractor @ F5
  

  Image Scale: 1.19 arcsec/pix  

  Field of View: 3d 7' 41.0" x 2d 3' 5.3 (127.3 x 190.1 arcmin)
  

  EQ Mount: Paramount ME   

  Image Acquisition software Maxim DL6, Pre Processing and Starnet
  in Pixinsight Post Processed in Photoshop CC 

    

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