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A big storm over Sydney region

  1. Mar 11, 2015 #1

    davenn

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    Hi all

    has a particularly nasty storm over the Sydney city area last nite
    trees down, building damaged, this morning still many homes without power

    a couple of lightning shots from home ......

    2015_03_11_3270-1sm.jpg

    2015_03_11_3289-1sm.jpg



    cheers
    Dave
     
  2. jcsd
  3. Mar 11, 2015 #2
    Wow really nice action! Have you ever taken videos?
     
  4. Mar 11, 2015 #3

    davenn

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    Thanks :)
    yes, I did some of that from down at the local wharf till the storm hit, then headed home to continue photo'ing from the relative safety of home

    With all the new cameras and their HD capabilities, its frustrating that I ( and others) cannot produce great HD lightning video
    With the CMOS sensor, that is almost the only available these days, they cannot handle the bright lightning flashes with the "rolling stutter" system they use
    they produce dark and light banding across the frame


    For video, Im still using a 9 year old Fuji S9500 that uses a CCD sensor, they used a on/off shutter mechanism. ( the signal from the sensor was switched on and off for each of the 25 - 30 fps frame rate) This resulted in clean lightning video but poorer quality because of the age of the technology and they are only around 640 x 480

    I will still often pull individual frames out of the .avi video. Not overly sharp, but still good to look at :smile:

    an example .....

    070224(2579).jpg

    cheers
    Dave
     
    Last edited: Mar 12, 2015
  5. Mar 12, 2015 #4

    Astronuc

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    Those cameras need a filter like those used on welding masks that darken according to the intensity of the arc, and clear up as the intensity diminishes.
     
    Last edited: Mar 12, 2015
  6. Mar 12, 2015 #5

    berkeman

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    How many antennas do you have on that mast in the first pic? Did you leave the feed lines connected during the storm?
     
  7. Mar 12, 2015 #6

    davenn

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    Hi Mike

    the top antenna is a Diamond X7000 tri-band vertical co-linear
    • 144/430/1200MHz (2m/70cm/23cm)
    • Gain:8.3dB (144MHz), 11.7dB (430MHz), 13.7dB (1200MHz)
    • Max. power rating:100W (144/430MHz), 60W (1200MHz)
    • Impedance: 50ohms
    • VSWR: Less than 1.5:1
    • Length: 5.0m
    • Radial length: approx. 52cm
    • Weight: 2.2kg
    • Rated wind velocity: 40m/sec.
    • Mast diameter accepted: 30mm to 62mm
    • Connector: N series female
      Type: 3 x 5/8wave C-Load (144MHz), 8 x 5/8wave C-Load (430MHz), 14 x 5/8wave C-Load (1200MHz), FRP outer shell
    the yagi is 7 ele on 144 for SSB DX

    There's a looped nylon cord that I use to pull up and down a 40m inverted V

    Yes I make a habit of disconnecting the radio from the antenna
    its a Kenwood TS2000X ( HF - 23cm) shack in a box haha

    I'm in a rental property so cannot get too carried away with radio antennas

    cheers
    Dave
     
  8. Mar 12, 2015 #7

    davenn

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    That would be sweet ... haven't seen anything like that for a camera. I miss a few strikes cuz they are just so close and bright that the image is just totally overexposed

    Dave
     
  9. Mar 13, 2015 #8

    davenn

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    here's a couple of examples of the cursed rolling shutter effect
    it really destroys the images ....

    example1.JPG


    example2.JPG

    cheers
    Dave
     
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