Optolong L-PRO Maximum Luminosity Filter - Sony Full Frame Clip Filter

Optolong L-Pro (L-Professional) filter The SONY FULL FRAME version is the latest clip filter The Optolong L-Pro (L-Professional) filter is designed to provide maximum luminosity of the spectrum other than those areas caused by light pollution... Designed for slightly light polluted, suburban and rural areas where there is light pollution, but not severe. It improves the visibility of various deepsky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). As this filter is highly transparent in main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution. Unlike other light pollution filter UHC and CLS, L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression. By providing maximum luminosity it reduces exposure time that is an important factor in deep sky imaging. The space is there, but imagine a trapesoid shap of the chamber and the same trapesoid shape of the filter housing... you cannot slide it in from the side (like