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| Tidal Estuary Photography Project for Inshore Rescue - Page 4 | |
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| Posted: Sat Apr 6th, 2019 07:00 |
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31st Post |
Bob Bowen
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Love you tidal landscapes Robert. Hope you feel better soon.
____________________ Bob Bowen |
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| Posted: Sat Apr 6th, 2019 12:13 |
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32nd Post |
jk
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Hope the high tide pictures came out well. I am sure that they are good. Love the swirl of the esturary in the first image.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sat Apr 6th, 2019 12:49 |
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33rd Post |
Robert
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Bob Bowen wrote:Love you tidal landscapes Robert. Hope you feel better soon. Thanks Bob, I really enjoy getting these pictures, that helps but everything is a big effort at the moment. Will soon be back to normal, I hope. I seem to have energy in waves, boundless energy then lethargy! LOL
____________________ Robert. |
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| Posted: Sat Apr 6th, 2019 13:12 |
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34th Post |
Robert
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jk wrote:Hope the high tide pictures came out well. I am sure that they are good. The shapes and forms of the channels are amazing. I got about 3½ hours of video of the tidal flow, compressed into about 27 seconds! I have stretched it to about a minute and a half and posted it on YouTube. The compression is crap, it's WAY better with the original in iMovie. I may try re-processing the files. For what it's worth here is my first attempt of a time-lapse tidal flow, started at about 06:30 am BST to about 11:00 am BST. High tide was about noon. I slipped up and didn't charge the D800 battery so when I realised after about 30 minutes, I swapped it out for Eric's Battery. That did 4 hours of time-lapse and ran out, I had set the D800 to record until noon, high tide time. I have a 'cheap' plastic motor drive second battery holder, I believe that will allow me to use both batteries to power the D800, effectively doubling the recording time. Also, I made an exposure every 15 seconds, I plan to increase that to every 5 seconds, that should produce a smoother video. I am very disappointed with the poor quality from the YouTube video, I may have settings wrong, I always struggle with video, it's a pretty specialised area. I very rarely do video so most of the terminology is gibberish to me. Anyway, enough excuses, lets see if it works... BTW, many thanks to Chris, who has made this possible. I have some horse pix of my own I will post once I have this working.
____________________ Robert. |
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| Posted: Sat Apr 6th, 2019 14:03 |
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35th Post |
Robert
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Horsey pix for Chris... Belonging to Terry and Sharon, who kindly allow me to access their farm land for photography purposes. D3, Nikkor 80-200 f2.8 (trombone) ISO200, between 1/2500 sec and 1/5000 sec, f/2.8 active AF.  Hey! What about me?   Together. 
____________________ Robert. |
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| Posted: Sat Apr 6th, 2019 15:02 |
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36th Post |
jk
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That is very good for first shoot. The weather looks a bit hazy. It was here in Cornwall. Really need a cold, dry day with no wind, I think, for best results. I think that you need to go low to high tide which is a 12 hour span (actually usually about 11hrs 35mins if I remember correctly) or vice versa. Every 15 seconds is good as this will smooth well. Every 5 seconds will give you huge number of images. For meI would probably go for 1 exposure per minute = 12hrs x 60mins = 720 exposures so that will be one fully charged D800 battery! I think!
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Sat Apr 6th, 2019 15:33 |
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37th Post |
Robert
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Thanks JK, yes it was very hazy, we couldn't see the offshore wind turbines, in the last hour it cleared, but by then the battery had gone. It was very cold and very windy at first, we also had to deal with cows, I was concerned they might try to use the D800 on a tripod as a scratching post, knock it over than trample it in the mud. I anchored the camera to some barbed wire and positioned the tripod in a precarious position on the edge of a deep quarry. I had to apply slow motion to 25% and 10% of normal to make the video which was about 22 seconds long to start with, a reasonable length. Otherwise if you blinked you missed it! The D800 has a video trick up it's sleeve, this was the first time I have used it intentionally (don't ask!), what it does is take the exposures in a different format, then at the end of the recording it assembles a video clip, it's one single file. The finished file is quite small (64Mb) compared with the thousands of exposures I have taken in the past to assemble into a movie. It does this quite seamlessly, even when the camera's battery runs out of charge (but not if you switch the camera off before it's done). Nikon's default is five seconds per frame, one can go down to 1 second if needed to get an appropriate replay speed.
____________________ Robert. |
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| Posted: Sat Apr 6th, 2019 17:07 |
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38th Post |
chrisbet
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Nice to see horses in the sunshine  Grey and damp day here... The video isn't too bad if you watch full screen and crank it up to 1080 in the settings. Not sure why you stretched it out - it looks better to me at twice that speed.
____________________ If it is broken it was probably me .... |
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| Posted: Sun Apr 7th, 2019 02:36 |
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39th Post |
Robert
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chrisbet wrote:The video isn't too bad if you watch full screen and crank it up to 1080 in the settings. Not sure why you stretched it out - it looks better to me at twice that speed. I thought it was set at 1080, I was sure I selected that setting but this is only a trial run, I need to get used to the video setup with the camera. In the past I have done T-L by taking JPEGs every 15 or 20 seconds then combining them into a video in photoshop but the process is messy, convoluted and very time consuming. I have thousands of images watching leaf buds bursting taken at 30 minute intervals over weeks. With the D800 all you have to do is make some settings in the camera and walk away. The result is a single video file which is ready to view, easy peasy! I love it, can't wait to do more... I stretched the video because there is so much happening as the channels fill and envelop the sandbanks it's impossible to follow the action from about 3½ Hrs compressed into 22.4 seconds. The main reason for the video is so people can see how the channels fill and how easy it is to get cut off very quickly, far quicker than you can run. Once the bore starts to flow things happen very quickly. It's very interesting to see how gently the water rises until a certain point when it starts to surge in. I don't think the tide graphs accurately reflect the ramp profile of the tidal rise, it's not linear, there is a very distinct surge. The Inshore Rescue's focus is on avoiding people getting into trouble on the sands in the first place.
____________________ Robert. |
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| Posted: Sun Apr 7th, 2019 04:01 |
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40th Post |
jk
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Robert, The tidal rate of change is not linear. See here. https://en.m.wikipedia.org/wiki/Rule_of_twelfths Therefore you need to maybe change rate to a slower frame for first and last two hours of the time but in the middle 8 hours you need a faster frame to show the change.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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