Optolong L-Quad Enhance 2 filter (SKU: L-QEF-2) Filters for Astronomy opinie

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The multi-range Optolong L-Quad Enhance (L-QEF) 2" filter was designed for use in professional astrophotography. The use of this type of filter allows not only to achieve spectacular effects in terms of image quality, but also to shorten the exposure time by simultaneous collection of signals coming from the main emission lines of nebular objects, as well as star clusters and galaxies.

This filter transmits over 90% of the light in the spectral lines emitted by ionized hydrogen atoms (Hα and Hβ), oxygen (OIII) and sulfur (SII). Combined with the efficient cutting of spectral lines characteristic of sodium and mercury vapor lamps, this allows you to record sharp, detailed and contrasting images even near large cities or during bright, moonlit nights.

The Optolong L-Quad Enhance 2" filter can be used with both digital SLR cameras and CMOS / CCD cameras. An example of the filter's use can be found at www.optolong.com/index.php/cms/document/detail/id/290. html.

The most important features of the Optolong L-Quad Enhance 2" filter

• dual-band high transmission filter for OIII, SII, Hβ and Hα lines
• Compatible with DSLR cameras as well as CCD or CMOS cameras
• high efficiency in cutting out light pollution

Technical parameters

• filter type: multiband filter
• Filter diameter: 2"
• passed bands: OIII (495.9 nm, 500.7 nm), Hβ (486.1 nm), Hα (656.3), SII (671.6 nm; 672.4 nm)
• maximum transmission: >90%
• blocking range: 300 - 1000 nm
• optical density equivalent for blocked bands: OD2 - OD4
• blocked bands of light pollution: mercury lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), sodium lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm)
• filter material: optical glass
• filter thickness: 1.85 mm
• surface quality index: 60/40
• parallelism: 30"
• RMS accuracy: λ/4

Set elements

• Optolong L-Quad Enhance 2" filter
• plastic protective packaging

Guarantee

36 months