{"id":6755,"date":"2013-06-10T06:05:16","date_gmt":"2013-06-10T04:05:16","guid":{"rendered":"http:\/\/lukse.lt\/uzrasai\/?p=6755"},"modified":"2013-12-22T23:20:19","modified_gmt":"2013-12-22T21:20:19","slug":"diy-telescope-from-mto-500-lens-and-webcam","status":"publish","type":"post","link":"https:\/\/lukse.lt\/uzrasai\/2013-06-diy-telescope-from-mto-500-lens-and-webcam\/","title":{"rendered":"DIY telescope from MTO-500 lens and webcam"},"content":{"rendered":"<p style=\"text-align: justify;\"><a href=\"http:\/\/lukse.lt\/uzrasai\/2013-06-diy-telescope-from-mto-500-lens-and-webcam\/\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6757 alignleft\" alt=\"IMG_6914_t\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6914_t.jpg\" width=\"200\" height=\"133\" \/><\/a>I had an old Russian lens (MTO-500) laying around for a long time. Tried using it on DSLR, but because of lack of image quality I refused this idea. Today I mounted webcam on it. Because of smaller image sensor magnification is much larger in this conjunction.<\/p>\n<div align=\"center\"><!--more--><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_6767\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6927_r.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6927_r.jpg\" rel=\"lightbox[6755]\"><img decoding=\"async\" aria-describedby=\"caption-attachment-6767\" class=\"wp-image-6767 \" alt=\"IMG_6927_r\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6927_r.jpg\" width=\"600\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6927_r.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6927_r-400x291.jpg 400w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><p id=\"caption-attachment-6767\" class=\"wp-caption-text\">Streaming live using Carambola2<\/p><\/div>\n<div id=\"attachment_6783\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_i.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_i.jpg\" rel=\"lightbox[6755]\"><img decoding=\"async\" aria-describedby=\"caption-attachment-6783\" class=\"wp-image-6783 \" alt=\"IMG_6922_i\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_i.jpg\" width=\"600\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_i.jpg 1500w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_i-400x230.jpg 400w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_i-1024x589.jpg 1024w\" sizes=\"(max-width: 1500px) 100vw, 1500px\" \/><\/a><p id=\"caption-attachment-6783\" class=\"wp-caption-text\">Some frames mapped to wide angle photo<\/p><\/div>\n<div id=\"attachment_6858\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_0614_r.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_0614_r.jpg\" rel=\"lightbox[6755]\"><img decoding=\"async\" aria-describedby=\"caption-attachment-6858\" class=\"wp-image-6858  \" alt=\"IMG_0614_r\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_0614_r.jpg\" width=\"600\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_0614_r.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_0614_r-400x300.jpg 400w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><p id=\"caption-attachment-6858\" class=\"wp-caption-text\">Shooting the Moon<\/p><\/div>\n<div align=\"center\"><iframe loading=\"lazy\" width=\"612\" height=\"460\" src=\"http:\/\/www.youtube.com\/embed\/XGIXXzHwBAE?rel=0\" allowfullscreen=\"\" frameborder=\"0\"><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>There is nothing fancy with this setup. Couple of extension rings, adapters and webcam clamped to lens. Carambola2 is set to stream video using mjpg_streamer. (firmware is <a onclick=\"javascript:pageTracker._trackPageview('\/outgoing\/www.lukse.lt\/failai\/carambola2_video_firmware\/fw2_video2.bin');\"  href=\"http:\/\/www.lukse.lt\/failai\/carambola2_video_firmware\/fw2_video2.bin\">here<\/a>)<\/p>\n<p>To increase video quality I recommend tweaking webcam parameters (or adjust to your needs):<\/p>\n<pre class=\"lang:sh decode:true\">v4l2-ctl --set-ctrl brightness=10\r\nv4l2-ctl --set-ctrl contrast=64\r\nv4l2-ctl --set-ctrl gamma=75\r\nv4l2-ctl --set-ctrl saturation=100\r\nv4l2-ctl --set-ctrl sharpness=64\r\n\r\nv4l2-ctl --set-ctrl focus_auto=0\r\nv4l2-ctl --set-ctrl focus_absolute=0<\/pre>\n<p>To view all settings you can type this command:<\/p>\n<pre class=\"lang:sh decode:true  crayon-selected\">v4l2-ctl --list-ctrls<\/pre>\n<p>You should see something like this:<\/p>\n<pre class=\"lang:sh decode:true\">root@OpenWrt:~# v4l2-ctl --list-ctrls\r\n                     brightness (int)    : min=-64 max=64 step=1 default=23 value=10\r\n                       contrast (int)    : min=0 max=64 step=1 default=35 value=64\r\n                     saturation (int)    : min=0 max=128 step=1 default=66 value=100\r\n                            hue (int)    : min=-40 max=40 step=1 default=0 value=0\r\n white_balance_temperature_auto (bool)   : default=1 value=1\r\n                          gamma (int)    : min=72 max=500 step=1 default=106 value=75\r\n                           gain (int)    : min=0 max=100 step=1 default=0 value=0\r\n           power_line_frequency (menu)   : min=0 max=2 default=1 value=1\r\n      white_balance_temperature (int)    : min=2800 max=6500 step=1 default=6500 value=6500 flags=inactive\r\n                      sharpness (int)    : min=0 max=64 step=1 default=35 value=64\r\n         backlight_compensation (int)    : min=0 max=2 step=1 default=0 value=0\r\n                  exposure_auto (menu)   : min=0 max=3 default=3 value=3\r\n              exposure_absolute (int)    : min=0 max=0 step=0 default=0 value=0 flags=inactive<\/pre>\n<p>mjpeg_streamer is set to start automatically on boot<\/p>\n<blockquote>\n<p>\/etc\/init.d\/mjpg-streamer enable<\/p>\n<\/blockquote>\n<p>With settings:<\/p>\n<pre class=\"lang:sh decode:true\">root@OpenWrt:~# cat \/etc\/config\/mjpg-streamer\r\nconfig mjpg-streamer core\r\n        option enabled          \"1\"\r\n        option device           \"\/dev\/video0\"\r\n        option resolution       \"800x600\"\r\n        option fps              \"30\"\r\n        option port             \"8080\"<\/pre>\n<p>&nbsp;<\/p>\n<div id=\"attachment_6758\" style=\"width: 394px\" class=\"wp-caption alignnone\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_r.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_r.jpg\" rel=\"lightbox[6755]\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6758\" class=\" wp-image-6758  \" alt=\"IMG_6922_r\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_r.jpg\" width=\"384\" height=\"256\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_r.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6922_r-400x266.jpg 400w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/a><p id=\"caption-attachment-6758\" class=\"wp-caption-text\">Picture at 10mm on DSLR with 1.6x crop ratio<\/p><\/div>\n<div id=\"attachment_6759\" style=\"width: 394px\" class=\"wp-caption alignnone\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6923_r.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6923_r.jpg\" rel=\"lightbox[6755]\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6759\" class=\" wp-image-6759   \" alt=\"IMG_6923_r\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6923_r.jpg\" width=\"384\" height=\"256\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6923_r.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/IMG_6923_r-400x266.jpg 400w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/a><p id=\"caption-attachment-6759\" class=\"wp-caption-text\">Picture at 300mm on DSLR with 1.6x crop ratio<\/p><\/div>\n<div id=\"attachment_6762\" style=\"width: 394px\" class=\"wp-caption alignnone\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h28m45s50.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h28m45s50.jpg\" rel=\"lightbox[6755]\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6762\" class=\" wp-image-6762  \" alt=\"vlcsnap-2013-06-09-19h28m45s50\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h28m45s50.jpg\" width=\"384\" height=\"288\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h28m45s50.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h28m45s50-400x300.jpg 400w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/a><p id=\"caption-attachment-6762\" class=\"wp-caption-text\">Picture of the TV tower viewed from webcam<\/p><\/div>\n<div id=\"attachment_6763\" style=\"width: 394px\" class=\"wp-caption alignnone\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h30m40s183.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h30m40s183.jpg\" rel=\"lightbox[6755]\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6763\" class=\" wp-image-6763  \" alt=\"vlcsnap-2013-06-09-19h30m40s183\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h30m40s183.jpg\" width=\"384\" height=\"288\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h30m40s183.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h30m40s183-400x300.jpg 400w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/a><p id=\"caption-attachment-6763\" class=\"wp-caption-text\">Buildings 10km away<\/p><\/div>\n<div id=\"attachment_6761\" style=\"width: 394px\" class=\"wp-caption alignnone\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h12m49s227.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h12m49s227.jpg\" rel=\"lightbox[6755]\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6761\" class=\" wp-image-6761  \" alt=\"vlcsnap-2013-06-09-19h12m49s227\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h12m49s227.jpg\" width=\"384\" height=\"288\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h12m49s227.jpg 800w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/vlcsnap-2013-06-09-19h12m49s227-400x300.jpg 400w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/a><p id=\"caption-attachment-6761\" class=\"wp-caption-text\">Buildings 10km away<\/p><\/div>\n<div id=\"attachment_6773\" style=\"width: 374px\" class=\"wp-caption alignnone\"><a onclick=\"javascript:pageTracker._trackPageview('\/downloads\/uzrasai\/wp-content\/uploads\/2013\/06\/zemalapis.jpg');\"  href=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/zemalapis.jpg\" rel=\"lightbox[6755]\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6773\" class=\" wp-image-6773  \" alt=\"zemalapis\" src=\"http:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/zemalapis.jpg\" width=\"364\" height=\"232\" srcset=\"https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/zemalapis.jpg 1247w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/zemalapis-400x255.jpg 400w, https:\/\/lukse.lt\/uzrasai\/wp-content\/uploads\/2013\/06\/zemalapis-1024x654.jpg 1024w\" sizes=\"auto, (max-width: 364px) 100vw, 364px\" \/><\/a><p id=\"caption-attachment-6773\" class=\"wp-caption-text\">Line of sight<\/p><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I had an old Russian lens (MTO-500) laying around for a long time. Tried using it on DSLR, but because of lack of image quality I refused this idea. Today I mounted webcam on it. Because of smaller image sensor magnification is much larger in this conjunction.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[38,4,21,5,15],"tags":[],"class_list":["post-6755","post","type-post","status-publish","format-standard","hentry","category-in-english","category-nuotraukos","category-projektai","category-uzrasai","category-video"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2rU5c-1KX","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/posts\/6755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/comments?post=6755"}],"version-history":[{"count":43,"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/posts\/6755\/revisions"}],"predecessor-version":[{"id":7328,"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/posts\/6755\/revisions\/7328"}],"wp:attachment":[{"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/media?parent=6755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/categories?post=6755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lukse.lt\/uzrasai\/wp-json\/wp\/v2\/tags?post=6755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}