{"id":107506,"date":"2026-04-28T10:48:40","date_gmt":"2026-04-28T08:48:40","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=107506"},"modified":"2026-07-20T12:45:30","modified_gmt":"2026-07-20T10:45:30","slug":"tele-vue-bandmate-type-2-h-beta-2-line-filter","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-bandmate-type-2-h-beta-2-lijnfilter\/","title":{"rendered":"TeleVue Bandmate Type 2 H-Beta 2\" - Nebula Filter"},"content":{"rendered":"

TeleVue Bandmate Type 2 H-Beta 2\" : Lijnfilter: H-beta-lijnfilter in 2 inch<\/strong><\/h2>\n\n\n\n

De Bandmate Type 2 H-beta in 2 inch combineert het specialistenfilter met de grote overzichtsoculairs, precies wat de uitgestrekte Kalifornienevel vraagt.<\/p>\n\n\n\n

Ook dit filter past direct in de neus van een 2 inch zenitspiegel, zodat het bij het wisselen van oculairs gemonteerd blijft.<\/p>\n\n\n\n

\"TeleVue<\/figure>
\"TeleVue<\/figure>
\"TeleVue<\/figure><\/figure>\n\n\n\n
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\"TeleVue<\/figure>\n<\/div>\n\n\n\n
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How a line filter gains contrast<\/h4>\n\n\n\n

Emission nebulae emit their light in a handful of narrow spectral lines. Light pollution and the natural airglow do not; they spread out over the entire spectrum. A line filter lets only the nebula lines through and blocks the rest.<\/p>\n\n\n\n

The result is not a brighter image, but a darker background from which the nebula emerges. With a Dutch or Belgian sky, that difference is significant.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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\"TeleVue<\/figure>\n<\/div>\n\n\n\n
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Type 2: Built by Astronomik to TeleVue specifications<\/h4>\n\n\n\n

For the Bandmate Type 2 line, TeleVue is collaborating with filter specialist Astronomik. The transmission bands lie exactly on the emission lines, with transmission in the passband exceeding ninety percent and a sharp cutoff outside of it.<\/p>\n\n\n\n

The coating is polished and parfocal with TeleVue eyepieces, so focusing is hardly necessary after screwing it on. The filter housing has standard threads, making it compatible with any eyepiece with filter threads of the corresponding size.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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\"TeleVue<\/figure>\n<\/div>\n\n\n\n
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Waarvoor je een H-beta-filter gebruikt<\/h4>\n\n\n\n

Het H-beta-filter isoleert de waterstoflijn op 486 nanometer. De lijst objecten die daarom vraagt is kort maar beroemd: de Paardenkopnevel, de Kalifornienevel en enkele zwakke reflectiegrenzen die zonder dit filter onzichtbaar blijven.<\/p>\n\n\n\n

Voor die handvol doelen is het onmisbaar, daarbuiten doet het weinig. Een H-beta is daarom het derde nevelfilter in een verzameling, na een UHC en een OIII, en vraagt om een flinke telescoopopening en een donkere hemel.<\/p>\n<\/div>\n<\/div>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

The filter screws into the filter thread of each eyepiece in the corresponding size, and therefore also into the TeleVue eyepieces from our range. For use with a 2-inch diagonal mirror, a 2-inch filter can be inserted directly into the mirror nose.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n