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Looking for improvement This is the e-group critique board. If you post a picture here it will be assumed that you are looking for comprehensive technical feedback - both good and bad, but always respectful. Only post pictures here if you can deal with potentially negative constructive criticism. Anyone is qualified to comment and post feedback, and everyone is encouraged to do so. NB: "Looking for Improvement" is the place to post any pictures you would like advice on improving, no matter how bad you might think they are.

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Old 30th September 2018
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ISS transit over our back garden

My first go with Live Composite. It's a shot of the ISS travelling over our back garden using the Samyang 7.5mm fisheye. I used 4s per shot and just left it till the ISS was nearly out of the frame, probably around 4 minutes in all I'd guess. The first image is with minimal tweaking in LR, for the second I reduced the blue saturation and luminance and it's reduced the light pollution effect considerably. Which do folks prefer, as it was or more B&W.





Also anyone any ideas about why all the streaks are a bit jagged and don't look smooth? Is this just a digital pixel effect I have to live with or can the smoothness be improved?
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Old 30th September 2018
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Re: ISS transit over our back garden

Love the first one Phill, sky colour really sets off the photo. ISS is so bright...I think the "jagged" bits are possibly moire, or manybe just pixilation whatever that is.....
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Old 30th September 2018
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Re: ISS transit over our back garden

Thanks Mark, yes the ISS was really bright.
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Old 30th September 2018
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Re: ISS transit over our back garden

Well done Phil, I prefer the first shot too :-)
I have often wondered about these shots, how do you know the track of the ISS and is it visible to the naked eye?
As for the jagged bits; you didn't have any delay between exposures (anti-shock) did you? That might have caused some very small gaps in the streaks.
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Old 30th September 2018
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Re: ISS transit over our back garden

Thanks Iain. I prefer the blue one myself but was just interested how dropping the blue luminence and saturation seemed to reduce the light pollution a lot.
There are websites that tell you exactly where and when you can see it overhead and they are very reliable. Here's one
https://spotthestation.nasa.gov/sightings/index.cfm
In this case though it was a tip off from a friend.
Oh and yes you can see it really clearly with the naked eye, if it's not cloudy of course.
Yes I did have anti shock on maybe that was the cause good spot. I also had forgotten to turn the IBIS of as I was using a tripod but it seems that when you go to Live composite the camera turns it off for you so luckily that was OK.
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Old 30th September 2018
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Re: ISS transit over our back garden

Great job Phil. Like the others I prefer the first shot.

I think someone here has already done a post of the ISS passing in front of the Moon but if anyone wants to try it here is a very useful site.

https://transit-finder.com
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Old 1st October 2018
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Re: ISS transit over our back garden

Now that would need some planning and patience I suspect. Definitely worth a go though one day. I remember those moon transit images you referred to as well they were stunning. I think I've seen a sun one too somewhere.
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Re: ISS transit over our back garden

Yes I did a one of a sun transit. Also Johnskids did a very successful one showing the ISS on each of the multiple exposures as it crossed the sun, about 13 I think.

Was fairly easy, I did mine hand held. Timing is critical, as it crosses the sun in less than a second. Dave mentioned the website that tells you to the second the timing. All you need is an accurate watch/clock. Wifey was shouting the time out for me, and click once with the high continuous exposure.

BUT beware you need a Baader filter to photo the sun, or you will go blind...
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Re: ISS transit over our back garden

Great job. I prefer the blue.
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Re: ISS transit over our back garden

Sod's law dictated an ISS discussion on my early morning daily dog walk get together and, I completely forgot to look.

I'll go with the flow. Given my poor eyesight - #2 is too dark to make things out - #1 for me too.
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Old 2nd October 2018
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Re: ISS transit over our back garden

Excellent shots Phill. I don't get any jagged sections in my shots, I'll check my settings when home.

I use https://www.heavens-above.com to check when the ISS is visible (and the phone app is great and well worth the small cost to check exactly where in the sky it'll be crossing). Transit-finder.com (mentioned below) is great for solar or lunar transit shots.

As mentioned timing is the key. For transit shots the ISS may not be visible before the crossing so you need to get it spot on (my solar transit shoot was taken around noon on a summers day). For transit shots try to get hold of a phone app that shows you the time from GPS signals. Just opened mine (GPS Time on Android) and it shows my phone is 2 seconds out. That's enough for you to miss the moment.
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Old 3rd October 2018
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Re: ISS transit over our back garden

Thanks skids I'd be interested to confirm if Iain was correct in his explanation. It sounded good to me I admit.
I looked at heavens above but couldn't get an ID on the Iridium flare so maybe it wasn't one. Any idea how to ID what satellite it was? I'm curious now.
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Old 5th October 2018
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Re: ISS transit over our back garden

Hi Phill,

Here's a straight jpeg from RAW I took about a year ago using Live Comp.

Untouched ISS Shot by jonskids, on Flickr

Live comp, anti shock was on. Follow the Flickr link and you'll see the settings.

Re the Iridium flares. Sadly there is a new generation of Iridium satellites being put into service and they won't flare (see http://www.skyatnightmagazine.com/ne...cease-end-2018) and the existing satellites are being decommissioned (left to go into a low orbit and spin around a bit)...

Sites like Heavens Above will still show what they expect to happen but by the end of the year flares will be a thing of the past which is a shame.
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Old 5th October 2018
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Re: ISS transit over our back garden

That looks slightly jagged too but not as much as mine did.
Will have to try one without anti shock one day to see if I can tell the difference.
Nice shot btw.
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Old 6th October 2018
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Re: ISS transit over our back garden

I got some shots with my Canon gear but not tried My omd 2 .


could it be jagged because its turning as it goes along ?
Rob.
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