{"id":1350,"date":"2021-03-04T12:02:08","date_gmt":"2021-03-04T05:02:08","guid":{"rendered":"http:\/\/weathervn.com\/?p=1350"},"modified":"2021-03-05T09:29:17","modified_gmt":"2021-03-05T02:29:17","slug":"nhiep-anh-thien-van-va-cac-van-de-voi-nguoi-moi-choi-bai-1-1-tran-ha","status":"publish","type":"post","link":"https:\/\/vietweather.com\/index.php\/nhiep-anh-thien-van-va-cac-van-de-voi-nguoi-moi-choi-bai-1-1-tran-ha\/","title":{"rendered":"Nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i (B\u00e0i 1-1) – Tr\u1ea7n H\u1ea1"},"content":{"rendered":"

Nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i (B\u00e0i 1-1) – Tr\u1ea7n H\u1ea1<\/p>\n

Nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i \u2013 \u0110\u00e0i quan s\u00e1t Nam H\u00e0 N\u1ed9i (wordpress.com)<\/a><\/p>\n

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1. L\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ea7n ghi h\u00ecnh<\/strong><\/p>\n

B\u1ea7u tr\u1eddi c\u00f3 v\u00f4 s\u1ed1 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 ch\u00fang ta ghi h\u00ecnh. D\u1ef1a v\u00e0o c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 m\u00e0 nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n nghi\u1ec7p d\u01b0 c\u00f3 th\u1ec3 chia th\u00e0nh nhi\u1ec1u th\u1ec3 lo\u1ea1i, \u0111\u01a1n gi\u1ea3n nh\u1ea5t c\u00f3 th\u1ec3 k\u1ec3 \u0111\u1ebfn nh\u01b0 nhi\u1ebfp \u1ea3nh Milky Way, nhi\u1ebfp \u1ea3nh M\u1eb7t Tr\u1eddi, nhi\u1ebfp \u1ea3nh h\u00e0nh tinh\u2026 C\u00e1c th\u1ec3 lo\u1ea1i nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n kh\u00e1c nhau, d\u0129 nhi\u00ean, s\u1ebd y\u00eau c\u1ea7u mua s\u1eafm thi\u1ebft b\u1ecb kh\u00e1c nhau. Trong n\u1ed9i dung b\u00e0i vi\u1ebft n\u00e0y, t\u00f4i s\u1ebd t\u1eadp trung nhi\u1ec1u v\u00e0o nhi\u1ebfp \u1ea3nh DSO.<\/p>\n

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Tinh v\u00e2n, thi\u00ean h\u00e0 v\u00e0 c\u1ee5m sao l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a nhi\u1ebfp \u1ea3nh DSO.<\/strong><\/p>\n

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DSO<\/strong>\u00a0l\u00e0 g\u00ec?\u00a0DSO (Deep Sky Object)<\/strong>\u00a0l\u00e0 nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng thi\u00ean v\u0103n n\u1eb1m trong kh\u00f4ng gian s\u00e2u, tr\u1eeb nh\u1eefng v\u1eadt th\u1ec3 sau: c\u00e1c ng\u00f4i sao ri\u00eang l\u1ebb, c\u00e1c thi\u00ean th\u1ec3 n\u1eb1m trong h\u1ec7 M\u1eb7t Tr\u1eddi nh\u01b0 M\u1eb7t Tr\u0103ng, c\u00e1c v\u1ec7 tinh, h\u00e0nh tinh, sao ch\u1ed5i, thi\u00ean th\u1ea1ch\u2026 Nh\u01b0 v\u1eady, nhi\u1ebfp \u1ea3nh DSO h\u01b0\u1edbng \u0111\u1ebfn c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ch\u00ednh l\u00e0 tinh v\u00e2n, thi\u00ean h\u00e0 v\u00e0 c\u1ee5m sao.<\/p>\n

G\u00f3c nh\u00ecn tr\u00ean b\u1ea7u tr\u1eddi v\u00e0 \u0111\u1ed9 s\u00e1ng c\u1ee7a DSO g\u1ea7n nh\u01b0 l\u00e0 hai y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn \u201c\u0111\u1ed9 kh\u00f3\u201d khi ghi h\u00ecnh. M\u1ed9t c\u00f4ng c\u1ee5 \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 ki\u1ec3m tra g\u00f3c nh\u00ecn v\u00e0 \u0111\u1ed9 s\u00e1ng c\u1ee7a DSO c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi h\u1ec7 th\u1ed1ng c\u1ee7a m\u00ecnh hay kh\u00f4ng, \u0111\u00f3 l\u00e0 ph\u1ea7n m\u1ec1m m\u00f4 ph\u1ecfng b\u1ea7u tr\u1eddi Stellarium.<\/p>\n

\nhttp:\/\/weathervn.com\/wp-content\/uploads\/2021\/03\/Stellarium-FOV-calculator.mp4<\/a><\/video><\/div>\n

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M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c coi l\u00e0 \u201cph\u00f9 h\u1ee3p\u201d v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i ph\u1ea3i tho\u1ea3 m\u00e3n c\u1ea3 hai \u0111i\u1ec1u ki\u1ec7n: c\u00f3 g\u00f3c nh\u00ecn \u0111\u1ee7 l\u1edbn tr\u00ean b\u1ea7u tr\u1eddi v\u00e0 c\u00f3 \u0111\u1ed9 s\u00e1ng cao, d\u1ec5 d\u00e0ng ch\u1ee5p \u0111\u01b0\u1ee3c v\u1edbi th\u1eddi gian ph\u01a1i kh\u00f4ng qu\u00e1 d\u00e0i. M\u1ed9t s\u1ed1 tinh v\u00e2n h\u00e0nh tinh nh\u01b0 tinh v\u00e2n Nh\u1eabn (Ring nebula) tuy s\u1edf h\u1eefu \u0111\u1ed9 s\u00e1ng \u201ckh\u1ee7ng\u201d nh\u01b0ng l\u1ea1i c\u00f3 g\u00f3c nh\u00ecn t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ecf. Do \u0111\u00f3, \u0111\u1ec3 ghi h\u00ecnh \u0111\u01b0\u1ee3c ch\u00fang v\u1edbi \u0111\u1ed9 chi ti\u1ebft cao, ch\u00fang ta c\u1ea7n t\u1edbi h\u1ec7 th\u1ed1ng k\u00ednh n\u1eb7ng n\u1ec1 v\u00e0 gi\u00e1 th\u00e0nh kh\u00f4ng h\u1ec1 nh\u1ecf. T\u01b0\u01a1ng t\u1ef1, b\u1ea7u tr\u1eddi \u0111\u00eam c\u0169ng c\u00f3 nhi\u1ec1u tinh v\u00e2n s\u1edf h\u1eefu g\u00f3c nh\u00ecn l\u1edbn nh\u01b0ng l\u1ea1i v\u00f4 c\u00f9ng m\u1edd nh\u1ea1t, c\u1ea7n th\u1eddi gian ph\u01a1i s\u00e1ng d\u00e0i, \u0111\u00f4i khi l\u00ean t\u1edbi v\u00e0i ch\u1ee5c gi\u1edd \u1edf nh\u1eefng n\u01a1i c\u00f3 b\u1ea7u tr\u1eddi trong v\u00e0 \u00edt \u00f4 nhi\u1ec5m \u00e1nh s\u00e1ng. \u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i, anh em th\u01b0\u1eddng b\u1ed1i r\u1ed1i khi l\u1ef1a ch\u1ecdn m\u1ee5c ti\u00eau ph\u00f9 h\u1ee3p v\u1edbi tr\u00ecnh \u0111\u1ed9 v\u00e0 thi\u1ebft b\u1ecb c\u1ee7a m\u00ecnh. Th\u1ed1ng k\u00ea sau cho th\u1ea5y m\u1ed9t s\u1ed1 \u0111\u1ed1i t\u01b0\u1ee3ng ti\u1ec1m n\u0103ng ghi h\u00ecnh t\u1ea1i Vi\u1ec7t Nam:<\/p>\n

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(*) Ti\u00eau c\u1ef1 khuy\u00ean d\u00f9ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u1edbi c\u1ea3m bi\u1ebfn APS-C th\u00f4ng d\u1ee5ng.<\/em>
\n(*) Vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 m\u1ee9c \u0111\u1ed9 kh\u00f3 khi ghi h\u00ecnh d\u1ef1a nhi\u1ec1u v\u00e0o kinh nghi\u1ec7m c\u00e1 nh\u00e2n c\u1ee7a t\u00f4i ch\u1ee9 kh\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c c\u1ed1 \u0111\u1ecbnh n\u00e0o \u0111\u1ec3 \u0111\u00e1nh gi\u00e1.<\/em><\/p>\n

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D\u1ef1a v\u00e0o b\u1ea3ng tr\u00ean, ch\u00fang ta nh\u1eadn th\u1ea5y: \u0111\u1ec3 ghi h\u00ecnh nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng ti\u1ec1m n\u0103ng, m\u1ed9t k\u00ednh thi\u00ean v\u0103n s\u1edf h\u1eefu ti\u00eau c\u1ef1 d\u01b0\u1edbi 600mm l\u00e0 d\u1ec5 d\u00e0ng \u0111\u00e1p \u1ee9ng. C\u00f3 v\u00e0i v\u1eadt th\u1ec3 th\u1eadm ch\u00ed c\u00f3 th\u1ec3 ch\u1ee5p \u0111\u01b0\u1ee3c \u0111\u01b0\u1ee3c b\u1eb1ng lens tele m\u00e1y \u1ea3nh nh\u01b0 thi\u00ean h\u00e0 Ti\u00ean N\u1eef, tinh v\u00e2n Lagoon c\u00f9ng v\u00f9ng m\u00e2y b\u1ee5i l\u00e2n c\u1eadn (ch\u1ec9 c\u1ea7n ti\u00eau c\u1ef1 c\u1ee1 200mm).<\/p>\n

D\u1ef1 \u0111\u1ecbnh mua s\u1eafm thi\u1ebft b\u1ecb cho b\u1ea5t k\u1ef3 ai, k\u1ec3 c\u1ea3 ng\u01b0\u1eddi c\u00f3 kinh nghi\u1ec7m ch\u01a1i \u1ea3nh thi\u00ean v\u0103n c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u t\u1eeb kh\u00e2u t\u00ednh to\u00e1n kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch v\u1ec1 m\u1eb7t g\u00f3c nh\u00ecn (fov: field of view) c\u1ee7a h\u1ec7 th\u1ed1ng ghi h\u00ecnh v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng s\u1eafp nh\u1eafm t\u1edbi. M\u1ed9t l\u01b0u \u00fd r\u1eb1ng, v\u1edbi h\u1ec7 th\u1ed1ng c\u00e0ng g\u1ecdn nh\u1eb9 v\u00e0 tinh gi\u1ea3n, ch\u00fang ta c\u00e0ng ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c chi ph\u00ed cho c\u00e1c thi\u1ebft b\u1ecb li\u00ean quan. Ng\u01b0\u1eddi m\u1edbi ch\u01a1i n\u00ean tr\u00e1nh t\u00e2m l\u00fd \u201c\u0111ua\u201d \u0111\u1ed9 l\u1edbn c\u1ee7a k\u00ednh, hay cho r\u1eb1ng ti\u00eau c\u1ef1 k\u00ednh c\u00e0ng d\u00e0i th\u00ec c\u00e0ng ch\u1ee5p \u0111\u01b0\u1ee3c nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng tr\u00ean b\u1ea7u tr\u1eddi. Th\u1ef1c t\u1ebf, ti\u00eau c\u1ef1 c\u00e0ng d\u00e0i th\u00ec c\u00e0ng kh\u00f3 ki\u1ec3m so\u00e1t, \u0111\u1ed3ng th\u1eddi c\u0169ng kh\u00f4ng ph\u00f9 h\u1ee3p \u0111\u1ec3 ch\u1ee5p nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 g\u00f3c nh\u00ecn l\u1edbn (v\u00e0 d\u1ec5 ch\u1ee5p) tr\u00ean b\u1ea7u tr\u1eddi nh\u01b0 b\u1ea3ng tr\u00ean \u0111\u00e3 li\u1ec7t k\u00ea.<\/p>\n","protected":false},"excerpt":{"rendered":"

Nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i (B\u00e0i 1-1) – Tr\u1ea7n H\u1ea1 Nhi\u1ebfp \u1ea3nh thi\u00ean v\u0103n v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1edbi ng\u01b0\u1eddi m\u1edbi ch\u01a1i \u2013 \u0110\u00e0i quan s\u00e1t Nam H\u00e0 N\u1ed9i (wordpress.com)   1. L\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ea7n ghi h\u00ecnh B\u1ea7u tr\u1eddi c\u00f3 v\u00f4 s\u1ed1 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 […]\n","protected":false},"author":1,"featured_media":1351,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[37,1,35],"tags":[47,46],"_links":{"self":[{"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/posts\/1350"}],"collection":[{"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/comments?post=1350"}],"version-history":[{"count":6,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/posts\/1350\/revisions"}],"predecessor-version":[{"id":1380,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/posts\/1350\/revisions\/1380"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/media\/1351"}],"wp:attachment":[{"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/media?parent=1350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/categories?post=1350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vietweather.com\/index.php\/wp-json\/wp\/v2\/tags?post=1350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}