Optolong Filter L-Quad (L-QEF) 2"

Optolong Filter L-Quad (L-QEF) 2"

L-eNhance Filter for deep sky nebula photography from the city
The relentless spread or urbanization and its associated light pollution have become a growing problem for all amateur astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel. Especially with inexpensive newtonian telescopes, double-lens ED refractors or even achromats, the L-eNhance filters open up completely new possibilities for the capture of high-class astronomical images even out of the light polluted city. CMOS cameras can deliver images like monochrome cameras. This new generation of filters makes it possible to take amazing astrophotos directly from the light-polluted city with all its artificial light sources. The narrow bandpass for the wavelengths of O-III, H-Beta and H-Alpha and the almost complete attenuation of the interfering light sources of these new filters make this an ideal solution.

L-eNhance has a multiple anti-reflective coating on the optical substrate. The L-eNhance filter uses a precision coating based on ion deposition coating technology. This ensures durability and scratch resistance as well as stability on the CWL (central wavelength), which is not affected by temperature changes. Absolute precision and homogeneity of the coatings as well as maximum values for transmission in the passband and optical density in the off-band range are guaranteed for all filters.

• Professional photographic filter for astronomy
• Improves deep sky emission nebula photography
• Best choice for enhanced light pollution suppression
• For taking pictures also from highly light-polluted areas
• Tri-band filter with high transmission for O-III, H-Beta and H-Alpha lines
• Does not require very large or extremely expensive telescopes
• Excellent results also with inexpensive newtonian telescopes, double-lens ED refractors or even achromats
• CMOS colour cameras can deliver an image quality that comes close to CCD monochrome cameras
• Balanced colour for a natural image
• Filter diameter: 2,0 inches / 50,8 mm
• Connecting thread: M48x0.75mm
• Selected optical glass material
• Spectrum: 300-1000nm
• Off-Band Blocking: > 99%
• Surface Quality: 60/40 (Refer to MIL-O-13830)
• Fine-optically polished to ensure accurate 1/4 wavefront and highest parallelism over the both surfaces
• High transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm&500nm and H-beta 486nm).

• L-eNhance filter (1pc)
• Dust protection box (1pc)