×

Optolong L-Pro 2'' filter

optolong filter

This filter is designed to enhance the contrast of deep-sky objects and soften the brightness of the background sky, thanks to a sophisticated transmission that lets through light from the lines on which deep-sky objects shine (H-alpha, O -III , N-II, H-Beta, S-II…), but blocks harmful light emissions (for example the Hg line, or wavelengths of sodium vapor illumination). It also reduces background glow caused by oxygen in the atmosphere ("skyglow"). This filter is recommended for use in areas with light pollution and is suitable for both visual and photographic use.

Compared to other filters to reduce the effects of light pollution, such as UHC or CLS filters, this is a multi-bandpass filter that only minimally affects color rendering. Therefore, it is suitable for photographing objects that emit continuous light: not only emission nebulae, but also galaxies, star clusters, reflection nebulae, etc. You can achieve exposures up to 3 times longer than unfiltered exposures.

€147.93
Entrega entre 8 y 10 días laborables
Entrega entre 8 y 10 días laborables
Reference:
59435
Description

Treatment characteristics:

The treatments are not cemented onto the optical support, but are spread by electron beam evaporation and subsequent ion beam assisted deposition (IBAD process). This special process allows for extreme durability and scratch resistance, ensures central wavelength (CWL) stability, and prevents thermal drift. In addition, it allows a high transmission in the pass band and a high optical density in the range of blocked frequencies.

Attention, this filter must never be used only to observe the Sun!

Specifications:

Capacity

 
Coating of optical system  multiple
Frame  2" 
Transmission  95
Surface accuracy 1/4

General

Material Schott glass
Width (mm) 1,85
Type Filters 

Area of application

 
Useful for photographs yes
Visually useful yes
Nebulae & galaxies yes
Product Details
59435
Reviews
No comments

Menu

Share

QR code

Settings