If a natural color representation is what you want from you deep-sky imaging, an LRGB filter set should be your first choice. With OIII emission overlapping on the blue and green filters to allow high efficiency and natural color imaging of all deep-sky objects. The gap between green and red filters serves to block out the light pollution line at 589nm and improves the color of your images.
Size: 1.25”, 36mm or 2”
Coating Wavelength: 300-1050nm
Transmitted Wavefront RMS: λ/4
Parallelism (arcsec): 30s
Buy risk-free: When it’s time to trade up you’ll get the most value for your used gear.