– las criaturas torturadas –
Os confieso humildemente que no se que es un “Light Pollution Filters”, así que me ha parecido lo más razonable empezar con este párrafo en las dos versiones habituales.
Light-Pollution Sources
Light pollution comes from any artificial light, be it on a suburban porch or a city street lamp. If you think your town has a lot of street lights, New York City operates more than 250,000 of the dark-sky fighters—many unshielded. At 305 square miles, that is more than 820 street lamps per square mile. No wonder it is «The City that Never Sleeps.»
Fuentes de contaminación lumínica
La contaminación lumínica proviene de cualquier luz artificial, ya sea en un porche suburbano o en una farola de una ciudad. Si crees que tu ciudad tiene muchas luces de la calle, la ciudad de Nueva York opera más de 250,000 de los luchadores del cielo oscuro, muchos de ellos sin blindaje. A 305 millas cuadradas, eso es más de 820 farolas por milla cuadrada. No es de extrañar que sea «La ciudad que nunca duerme».
Sentado ya este principio básico ya estoy en condiciones de contaros que los aguerridos chicos de la tienda más grande del mundo en sus horas libres y no remuneradas han pasado revista a 9 de estos filtros antipolución de 9 fabricantes distintos y en las tres partes que componen su análisis os hartaréis de ver videos y leer sesudos comentarios sobre la cuestión.
Tal como puse en el título es “una oferta informativa que no podrá rechazar ningún fotógrafo nocturno ni astronómico”.
Estas son las redondas criaturas que han sido sometidas a tortura.
- Heliopan 77mm UV Filter– Test semi-control using a standard ultraviolet (UV) protection filter. Absorbs ultraviolet light.
- Ice 77mm Lipo Light Pollution Filter– Absorbs yellow sodium-vapor light. 1.25x filter factor.
- Tiffen 77mm T1/2 IR Filter– Blocks Near infrared (IR) to IR 680-800nm. 1.41x filter factor.
- SLR Magic 77mm Image Enhancer Filter– Prevents infrared light pollution. 1x filter factor.
- B+W 77mm UV/IR Cut MRC 486M Filter– Blocks 88% of UV light at 380nm, 95% of IR light at 700nm. 1x filter factor.
- Haida 77mm NanoPro MC Clear-Night Filter– Absorbs yellow sodium-vapor light. 1.25x filter factor.
- NiSi 77mm Natural Light Filter– Blocks yellow sodium and mercury-vapor light, as well as yellow light from low CRI LEDs. 1.5-2.8x filter factor.
- Schneider 77mm True-Cut 750 IR Filter– Blocks 50% of light at 750nm and progressively eliminates IR after 750nm, preventing infrared light pollution. Schneider offers another version that is targeted at the 680nm range. 1x filter factor.
- Kenko Astro LPR Type II Filter– Engineered to block the light emitted from the most common types of street lights, especially gas-charging mercury lamps and gas-charging sodium lamps. Recommended for 100mm telephotos or greater.
Y estas son las tres partes del análisis completo de B&H. Hala, que lo disfrutéis.
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