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> Optolong L-eXtreme Filter 1.25"[Áï½Ã°ø±Þ]
* ½ÃÁß°¡°Ý 262,900¿ø
* »óǰ°¡°Ý 210,000¿ø 2,100¿ø
* »óǰÄÚµå 0146_00019
* ¹è¼Û±â°£ 2ÀÏ ~ 4ÀÏ
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Quick Overview

  • Dual narrowband 1.25¡± filter for high-contrast imaging of emission nebulae, planetary nebulae, and supernovae remnants
  • Narrow 7nm passbands for OIII and H-alpha and rejection of light pollution and scattered moonlight for maximal image contrast
  • Electron-beam gun evaporation with ion-assisted deposition coating technology for durability and resistance to scratching
  • Precision ground and polished for superior image quality

Product Details

A. About Optolong's L-eXtreme Filter

The Optolong 1.25¡± L-eXtreme filter builds on the success of the renowned L-eNhance filter to deliver an even higher degree of contrast when imaging emission nebulae, planetary nebulae, and supernovae remnants. The L-eXtreme is two filters in one. It has a narrow 7nm passband centered on H-alpha at 656nm and a second 7nm passband centered on OIII near 501nm. The majority of nebulae have their strongest emission at these two wavelengths.

Unlike the L-eNhance filter, the L-eXtreme blocks the weaker H-beta emission line at 486nm to deliver more contrast in the fainter regions of nebulae, even in light-polluted sky. The narrower passbands of the L-eXtreme are especially important in blocking moonlight and broadband light pollution found in many urban and suburban centers.

The L-eXtreme is an ideal filter for use with DSLRs, one-shot color (OSC), and monochrome CCD and CMOS cameras, especially with fast optical systems. It¡¯s an indispensable filter for urban and suburban astrophotographers and for everyone who likes to extend their imaging sessions into nights when the moon is bright.

B. Spectral Curve Transmission Characteristics

  • FWHM: 7nm at O-III and 7nm at H-a
  • Blocking range: 300 - 1000nm
  • Light pollution line blocking depth: > 99%

C. Technical Specifications

  • Both surfaces are fine optically polished, accurate to 1/4 wavelength or better, and parallel to within 30 seconds or arc.
  • 1.85mm thick Schott B270 optical glass substrate material.
  • Very high surface quality of 60/40 or better (US Military Spec MIL-O-13830).

D. Optical Coating Specifications

  • Multi layer anti-reflection coated.
  • Non-cementing optical substrate coating.
  • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) so that there is no deviation due to temperature changes during use.
  • Precise and homogeneous coatings ensure high values of desired passband and blocking of unwanted offband.
  • Every single filter is tested and passed by Optolong before shipping to dealers.

E. Other

  • 1.25' astronomy filter with standard M28.5x0.6 male filter thread (no female thread, so it cannot be stacked with other filters).
  • Ultra-thin filter cell to minimize vignetting; clear optical aperture of 26mm.
  • Precision CNC-machined metal filter cell with sand blasted black anodized finish, anti-reflection treatment, and laser engraving.
  • High quality protective plastic storage case.

WARNING: Optolong filters are not designed for direct solar observation. NEVER use these filters for observing the Sun, or permanent eye and equipment damage will result.

 


 

 

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