{"product_id":"astronomik-h-beta-filter-125-round-mounted","title":"Astronomik H-Beta Filter - 1.25\" Round Mounted","description":"\u003ccenter\u003e\n\u003ch2 style=\"text-align: left;\"\u003eAstronomik 1.25-inch H-beta Visual Filter\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eThe Astronomik H-beta is a filter for visual observation, in particular with instruments of larger aperture. It lets the light of the H-beta emission line pass nearly unhindered and blocks the remaining spectral range to the extent that the eye is dark adapted. By the use of the Astronomik H-beta filter, the contrast is increased so strongly, that even the observation of the Horse Head Nebulae with telescopes of 10-inch - 12-inch reaches the realm of the possible. \u003cbr\u003e\u003cbr\u003e The optimal aperture ratio for the use of the filter is 1:4 to 1:6. The Astronomik H-beta filter will allow you to view large objects, in the whole field of view of the eyepiece, even when using wide-angle eyepieces - not only in the center of the eyepiece. This filter  should be used on telescopes with a diameter of 8-inch (200mm) or larger. Smaller instruments do not gather enough light for meaningful and satisfying astronomical work. Due to the high optical quality of the Astronomik H-beta filter substrate you will see the same needle-sharp stars as you would from your regular telescope.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2 style=\"text-align: left;\"\u003eAstronomik 1.25-inch H-beta Visual Filter Features\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cul\u003e\n\u003cli\u003eTransmission of nearly 100-percent of the H-beta line complete blocking of all disturbing wavelengths\u003c\/li\u003e\n\u003cli\u003eMain operational use: Hydrogen Nebulae No moisture (humidity) sensitivity, no aging, and totally scratch-proof\u003c\/li\u003e\n\u003cli\u003eExcellent carrier material - substrate is optically polished. The optical performance (resolution and contrast) of your telescope is not reduced in any way by the filter.\u003c\/li\u003e\n\u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm\u003c\/li\u003e\n\u003cli\u003eCompletely resistant against high humidity, scratches and aging effects\u003c\/li\u003e\n\u003cli\u003eDiffraction limited, the filter will not reduce the optical performance of your telescope!\u003c\/li\u003e\n\u003cli\u003eAstronomik filters are delivered in a high-quality, long lasting, filter box\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":50968890441814,"sku":"mjb1793365289820","price":65.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/5615\/9830\/files\/astronomik-h-beta-filter---125-round-mounted_1.jpg?v=1793365331","url":"https:\/\/looklabfashion.shop\/products\/astronomik-h-beta-filter-125-round-mounted","provider":"My Store","version":"1.0","type":"link"}