Starguide - A Practical Guide to Astro-Photography

Nice filter for color OSC CCD or DSLM cameras: Optolong l-eXtreme filter, best suited for emission nebulas

• 2-band 7nm bandpass filter (h-Alpha and OIII
• for use with one-shot color cameras like DSLMs
• blocks most light pollution, by city lights or even the moon
• maximizes contrast and signal to noise  ration 
• available in 1,25" and 2" size
• Thickness: 2mm

Astroshop: Optolong Filters L-eXtreme 2" (astroshop.eu)

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