[amsat-bb] Spectacular views: Dragon and ISS clearly visible over The Netherlands !
gjmagee at optusnet.com.au
Thu Jul 21 10:25:55 UTC 2016
Great pictures Hank. I think the wobbly is the turbulence in the air.
The atmosphere is constantly moving, the effect will be noticable more
on the ISS 'cause its moving too.
I would love to have seen the sight. Do you have the images on RAW
If so, you will be able to darken the sky a little and enhance the ISS.
On 21-Jul-16 5:26 AM, Ken Alexander wrote:
> My first thought was that it was some vibration from the mirror and
> shutter, but as you say, it doesn't happen on the stars. Still, if the
> ISS is much brighter then any little vibration artifacts will be
> brighter too.
> Next time, you could try holding a black card in front of (but not
> touching) the lens. Then open the shutter, wait a second for
> everything to quiet down and then pull the card away.
> I thought I read you used a D90? You can also use the mirror lock up
> function. There's more vibration from the mirror flipping up than
> from the shutter opening. The mirror lock up function pulls the
> mirror up out of the way, waits for a second for vibrations to settle
> down and then opens the shutter. The it flips back down when the
> shutter closes. It's worth a try.
> Ken Alexander
> On 2016-07-20 2:26 PM, PA3GUO wrote:
>> Hi John,
>> Also in the past my ISS photo's (with longer exposure, few seconds)
>> had the same.
>> I expect a ---- but I get a `----.
>> Not a straight line, but at the start a curly curve.
>> It is on all pictures.
>> I expected it to be related to movement of the camera, eg the
>> pressing of the button.
>> But why does the ISS stripe have it, and none of the stars?
>> Yesterday I took all pictures with an IR remote. Effect is still there.
>> Maybe the flipping of the mirror internally, but then again, why not
>> the stars?
>> Maybe because ISS is that bright ?
>> Frank answer: no clue.
>> Anyone ?
>> -----Oorspronkelijk bericht-----
>> Van: John Brier [mailto:johnbrier at gmail.com]
>> Verzonden: woensdag 20 juli 2016 19:42
>> Aan: PA3GUO
>> CC: AMSAT BB
>> Onderwerp: Re: [amsat-bb] Spectacular views: Dragon and ISS clearly
>> visible over The Netherlands !
>> Congratulations. That is really cool.
>> I see the Dragon streak far behind the ISS, but what is the dot/star
>> looking thing right behind the ISS?
>> On Wed, Jul 20, 2016 at 12:42 PM, PA3GUO <pa3guo at upcmail.nl> wrote:
>>> Last 2 nights both the ISS and SpaceX's Dragon cargo capsule were
>>> clearly visible over my location (Waalre, The Netherlands).
>>> I got great help of two friends setting up the camera & tracking the
>>> In the night of July 19th they were still separated 4 minutes. ISS
>>> already passed when Dragon showed up.
>>> However, in the night (early morning 03:35 local time...) of July 20th
>>> they were separated only 15 seconds / 115km.
>>> One really sees the two 'following' (trailing) each other (ISS is
>>> followed by Dragon).
>>> We had a bit of a challenge with the full moon.
>>> Fortunately, the basketball field helped out a bit as you can see on
>>> this picture: http://www.pa3guo.com/DSC_7644.JPG
>>> ISS is the bright stripe, the more dimmed stripe (below) is Dragon.
>>> Exposure (lens open): 10 seconds. ISS was approaching.
>>> Subsequent pictures are here:
>>> http://www.pa3guo.com/DSC_7648.JPG (here you see Dragon best)
>>> Then my two friends noticed during the final period of the pass that
>>> the Pleiades ("Seven Sisters") were accompanying them:
>>> Well, I finally saw a cargo ship and the ISS passing by together, it
>>> was truly a spectacular view !!
>>> Best regards,
>>> Henk - PA3GUO
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