DIY telescope from MTO-500 lens and webcam

2013-06-10 06:05 | Categories: In English, Nuotraukos, Projektai, Užrašai, Video

IMG_6914_tI 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.

 

 

 

IMG_6927_r

Streaming live using Carambola2

IMG_6922_i

Some frames mapped to wide angle photo

IMG_0614_r

Shooting the Moon

 

 

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 here)

To increase video quality I recommend tweaking webcam parameters (or adjust to your needs):

v4l2-ctl --set-ctrl brightness=10
v4l2-ctl --set-ctrl contrast=64
v4l2-ctl --set-ctrl gamma=75
v4l2-ctl --set-ctrl saturation=100
v4l2-ctl --set-ctrl sharpness=64

v4l2-ctl --set-ctrl focus_auto=0
v4l2-ctl --set-ctrl focus_absolute=0

To view all settings you can type this command:

v4l2-ctl --list-ctrls

You should see something like this:

root@OpenWrt:~# v4l2-ctl --list-ctrls
                     brightness (int)    : min=-64 max=64 step=1 default=23 value=10
                       contrast (int)    : min=0 max=64 step=1 default=35 value=64
                     saturation (int)    : min=0 max=128 step=1 default=66 value=100
                            hue (int)    : min=-40 max=40 step=1 default=0 value=0
 white_balance_temperature_auto (bool)   : default=1 value=1
                          gamma (int)    : min=72 max=500 step=1 default=106 value=75
                           gain (int)    : min=0 max=100 step=1 default=0 value=0
           power_line_frequency (menu)   : min=0 max=2 default=1 value=1
      white_balance_temperature (int)    : min=2800 max=6500 step=1 default=6500 value=6500 flags=inactive
                      sharpness (int)    : min=0 max=64 step=1 default=35 value=64
         backlight_compensation (int)    : min=0 max=2 step=1 default=0 value=0
                  exposure_auto (menu)   : min=0 max=3 default=3 value=3
              exposure_absolute (int)    : min=0 max=0 step=0 default=0 value=0 flags=inactive

mjpeg_streamer is set to start automatically on boot

/etc/init.d/mjpg-streamer enable

With settings:

root@OpenWrt:~# cat /etc/config/mjpg-streamer
config mjpg-streamer core
        option enabled          "1"
        option device           "/dev/video0"
        option resolution       "800x600"
        option fps              "30"
        option port             "8080"

 

IMG_6922_r

Picture at 10mm on DSLR with 1.6x crop ratio

IMG_6923_r

Picture at 300mm on DSLR with 1.6x crop ratio

vlcsnap-2013-06-09-19h28m45s50

Picture of the TV tower viewed from webcam

vlcsnap-2013-06-09-19h30m40s183

Buildings 10km away

vlcsnap-2013-06-09-19h12m49s227

Buildings 10km away

zemalapis

Line of sight

 

  1. v.pavardenis
    2013-08-16 16:31
    Reply | Quote | #1

    gal daugiau telecentro nuotraukų liko nuo eksperimento?

    • Saulius Lukšė
      2013-08-16 16:32
      Reply | Quote | #2

      Daugiau neliko, bet galiu padaryti. Kurios vietos reikia?

  2. v.pavardenis
    2013-08-16 17:26
    Reply | Quote | #3
  3. Saulius Lukšė
    2013-08-16 17:49
    Reply | Quote | #4
  4. v.pavardenis
    2013-08-16 18:09
    Reply | Quote | #5

    dėkoju

  5. v.pavardenis
    2014-08-23 10:49
    Reply | Quote | #6

    sveiki, Sauliau,
    gal galima būtų dar kelias nuotraukėles su telecentru? šiuo metu vyksta rekonstrukcijos darbai, domina kelios vietos, kurias apibraukiau: https://www.dropbox.com/s/5gz7zljr8z4xp67/tv.jpg

  6. Saulius Lukšė
    2014-08-23 14:11
    Reply | Quote | #7
  7. v.pavardenis
    2014-08-23 20:29
    Reply | Quote | #8

    ačiū!

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