Here's a cool comparison with a HyperStar C9.25 using no filter, a L-Pro Light Pollution Filter, and the new L-eNhance Filter from Optolong. The L-Pro has a 53% reduction of background light, and the L-eNhance has an amazing 91% reduction.

• Imaging Target： Rosette Nebula
• Camera : ZWO ASI294MC Pro
• Lens : HyperStar C9.25
• Filter : Optolong L-eNhance
• Exp time : 20 x 120"
• Taken by Starizona's:

Taken with 98.63% full moon

• Imaging Target： North America and Pelican Nebulas
• Camera : ZWO ASI294MC Pro
• Lens : Samyang 135mm f/2
• Filter : Optolong L-eNhance
• Exp time : 20 x 60"
• Taken by Starizona's:

• Imaging Target： North American Nebula
• Camera : ZWO ASI183MC Pro
• Lens : HyperStar C6
• Filter : Optolong L-eNhance
• Exp time : 60 x 45"
• Taken by Starizona's:

• Camera : CentralDS Astro A7s (cooled at -2C)
• Lens : Canon EF 300mm f/4L (non-IS)
• Filter : Optolong L-eNhance
• ISO : 6400
• Tracker : Star Adventurer
• Autoguide : none
• Exp time : 1min X 81frames w Dark, Bias frames
• Offered by Optolong co-photographer

After a simple red structure transformation, the effect of SHO Hubble color can also be simulated. !

• Substrate:B270
• Thickness:1.85mm
• Tpeak:T>90%
• Blocking range:300-1000nm
• Blocking depth:light pollution line blocking >99%
• Surface quality:60/40
• Transmitted Wavefront RMS:λ/4
• Parallelism (arcsec):30s