Optolong L-Pro 77mm Screw on Camera Filter

RM 140.40

Optolong L-Pro 77mm Filter

Specifications

Tpeak: T>90%
Spectrum: 380-750nm
Optical Density: Light pollution emission is blocked 90%
Surface Quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism (arcsec): 30s

Reference Spectrum

Manufacturing Technique

Fine-optically polishing for double-sides Ensure accurate λ/4 wavefront and <30 seconds parallalism over the both surfaces

Ultrasonic wave cleaning substrate with purified water. Cleanup by 13 purified water tank to remove inpurities and dust effectively

Iro source assisted coating For durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.

Constantly stringent quality testing processes Each filter was tested by spectrophotometer and laser interferometer testing spectrum and wavefront to ensure market filter is qualified product

Comparison Photos

M42 Orion Nebula

Summer Milk Way

Gallery

Canon 6D+Sigma 14-24/2.8+L-Pro Filter

M20 QHY247C+RASA CEM60+L-Pro Filter