![]() ![]() The narrower passbands of the L-eXtreme are especially important in blocking moonlight and broadband light pollution found in many urban and suburban centers. The convenience and cost effectiveness of this filter allows amateurs to image emission nebulae even in bright, light-polluted or moonlit skies. Product Advisor 800.266. Unlike the L-eNhance filter, the L-eXtreme blocks the weaker H-beta emission line at 486nm to deliver more contrast in the fainter regions of nebulae, even in light-polluted sky. The Optolong L-eXtreme is a 7nm dual-bandpass filter which can be used with one-shot color cameras like DSLRs and CCD/CMOS astrophotography cameras. 20 Optolong L-Pro 2' Mounted Filter SKU: OTL-LPRO-200 Filter Type: UV/IR/Luminance Filter Size: 50.8 mm (2') Filter Shape: Round Filter Insert Style: Threaded Free shipping 199.00 In Stock Add to cart As low as 6.43/Month Ask an Expert Dave B. The majority of nebulae have their strongest emission at these two wavelengths. It has a narrow 7nm passband centered on H-alpha at 656nm and a second 7nm passband centered on OIII near 501nm. With a focal length of 200mm and a fast f/4 focal ratio, this six-element ED lens lets you capture a wide field with less expensive smaller-sensor astro cameras. ![]() The Optolong 2” L-eXtreme filter builds on the success of the renowned L-eNhance filter to deliver an even higher degree of contrast when imaging emission nebulae, planetary nebulae, and supernovae remnants. Color Correction & Minus Violet Filters. ![]()
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