Olympus UK E-System User Group
Olympus UK E-System User Group

Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


Go Back   Olympus UK E-System User Group > Show your photos > Foto Fair

Foto Fair Post your photos for friendly, non-critical feedback. This is the place to show pictures if you aren't yet ready for full-blooded critique, or simply want to share an interesting picture with other e-group visitors.

Reply
 
Thread Tools Display Modes
  #1  
Old 1st August 2017
wornish's Avatar
wornish wornish is offline
Full member
 
Join Date: Sep 2015
Location: Cheshire
Posts: 1,932
Thanks: 166
Thanked 181 Times in 141 Posts
Likes: 809
Liked 457 Times in 220 Posts
Droplets

Weather awful so I thought I would try some droplet photography.
Only managed to do single drops so far controlling a release solenoid and a flash with a program I wrote in Python for my Raspberry Pi.

Good fun.

[IMG][/IMG]


Two drops colliding is the next challenge.
__________________
Dave
Reply With Quote
The Following Users Liked This Post:
Beagletorque (1st August 2017), Gwyver (1st August 2017), IainMacD (2nd August 2017), Innit (5th August 2017), MJ224 (1st August 2017), OM USer (1st August 2017), Phill D (1st August 2017), Ross the fiddler (2nd August 2017), steverh (1st August 2017), Tordan58 (1st August 2017), Walti (1st August 2017)
  #2  
Old 1st August 2017
Phill D's Avatar
Phill D Phill D is offline
Full member
 
Join Date: Apr 2011
Location: Derbyshire
Posts: 6,911
Thanks: 790
Thanked 1,032 Times in 959 Posts
Likes: 372
Liked 1,045 Times in 591 Posts
Re: Droplets

It looks like glass when it's frozen like that. Definitely good fun, catching water drops can be quite addictive, easily passes the time when it's wet
Reply With Quote
The Following User Liked This Post:
wornish (1st August 2017)
  #3  
Old 1st August 2017
David M's Avatar
David M David M is offline
Full member
 
Join Date: Dec 2007
Location: A Brit now living in Ontario, Canada.
Posts: 6,603
Thanks: 41
Thanked 683 Times in 645 Posts
Likes: 257
Liked 1,289 Times in 791 Posts
Re: Droplets

Try colouring the water you're using for the drops.
__________________
It's the image that's important, not the tools used to make it.

The Grumpy Snapper blog or follow me on Instagram.
Reply With Quote
The Following User Says Thank You to David M For This Useful Post:
wornish (1st August 2017)
  #4  
Old 1st August 2017
Tordan58's Avatar
Tordan58 Tordan58 is offline
Full member
 
Join Date: Mar 2011
Location: Malmö, Sweden
Posts: 2,710
Thanks: 289
Thanked 307 Times in 268 Posts
Likes: 264
Liked 936 Times in 267 Posts
Re: Droplets

Nice. I like it.
__________________

My Gallery on 500px
Reply With Quote
The Following User Says Thank You to Tordan58 For This Useful Post:
wornish (1st August 2017)
  #5  
Old 2nd August 2017
Wee man's Avatar
Wee man Wee man is offline
Senior Member
 
Join Date: Sep 2009
Location: Newcastle Co. Down N. Ireland
Posts: 7,688
Thanks: 2,374
Thanked 1,094 Times in 979 Posts
Likes: 283
Liked 1,051 Times in 699 Posts
Re: Droplets

Try dropping into a glass and use coloured LEDs from below for differing effects.

Sent from my LG-H870 using Tapatalk
__________________
Ed

What if the Hokey Cokey is what its all about?
Reply With Quote
The Following User Liked This Post:
wornish (6th August 2017)
  #6  
Old 5th August 2017
pdk42's Avatar
pdk42 pdk42 is offline
Full member
 
Join Date: Apr 2013
Location: Leamington Spa
Posts: 3,809
Thanks: 326
Thanked 824 Times in 625 Posts
Likes: 59
Liked 3,410 Times in 1,161 Posts
Re: Droplets

Very nice! Tell us more about the RPi application! What's the trigger being used?
__________________
Paul
E-M1ii, Pen-F and too many lenses
flickr
Reply With Quote
  #7  
Old 5th August 2017
wornish's Avatar
wornish wornish is offline
Full member
 
Join Date: Sep 2015
Location: Cheshire
Posts: 1,932
Thanks: 166
Thanked 181 Times in 141 Posts
Likes: 809
Liked 457 Times in 220 Posts
Re: Droplets

Quote:
Originally Posted by pdk42 View Post
Very nice! Tell us more about the RPi application! What's the trigger being used?

The way I do it doesn't require a trigger as such, its accurate timing.

You do need a darkened room for it to work properly.
I have the camera in Manual mode ISO 200, aperture f/11. and set the shutter speed at about 3 seconds. Manually focussed on where the the drop will hit the water. If you take a shot with no flash it comes out basically black. I simply trigger the camera and then manually start the control process in the RPi with a mouse click. The RPi does the accurate release timings in milliseconds.

The RPi first opens and closes a solenoid that releases a drop of water from above the dish. The time the solenoid is open for can be varied to adjust the size of the droplet. The release of the droplet automatically triggers another timer in the RPi that then fires the flash a number of milliseconds later, again this time can be adjusted to make sure the flash fires at the exact right moment.

The flash is connected via a cable release to the RPi. Flash set at 1/128 power which is very short duration and so freezes the drop at the exact right time.

I have now added the capability for the RPi to time the release of a second drop after another short delay and hope to capture a collision of the rising droplet with the second one coming down. Get the timings spot of for this is more challenging. I have programmed this in Python and have a control screen on my desktop that I can update and send new timings to the RPi for it to do its stuff. Keeps me occupied.

If anyone is interested I am happy to share code and connection info.

I have a little relay board attached to the RPi to trigger the Flash and the Water release solenoid.

Hope this makes sense.
__________________
Dave
Reply With Quote
The Following 2 Users Say Thank You to wornish For This Useful Post:
drmarkf (5th August 2017), Phill D (6th August 2017)
  #8  
Old 6th August 2017
wornish's Avatar
wornish wornish is offline
Full member
 
Join Date: Sep 2015
Location: Cheshire
Posts: 1,932
Thanks: 166
Thanked 181 Times in 141 Posts
Likes: 809
Liked 457 Times in 220 Posts
Re: Droplets

Discovered that the shape of the vessel holding the water makes a big difference to the droplet shape.

[IMG][/IMG]
__________________
Dave
Reply With Quote
The Following User Liked This Post:
Innit (7th August 2017)
  #9  
Old 7th August 2017
Phill D's Avatar
Phill D Phill D is offline
Full member
 
Join Date: Apr 2011
Location: Derbyshire
Posts: 6,911
Thanks: 790
Thanked 1,032 Times in 959 Posts
Likes: 372
Liked 1,045 Times in 591 Posts
Re: Droplets

That is interesting. I bet there is some interesting science behind that conical spray from a conical glass. Excellent shot by the way too.
Reply With Quote
  #10  
Old 11th August 2017
wornish's Avatar
wornish wornish is offline
Full member
 
Join Date: Sep 2015
Location: Cheshire
Posts: 1,932
Thanks: 166
Thanked 181 Times in 141 Posts
Likes: 809
Liked 457 Times in 220 Posts
Re: Droplets

A couple more with two drops colliding

[IMG][/IMG]


[IMG][/IMG]
__________________
Dave
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Oh No! More Droplets timmypreston Foto Fair 8 1st January 2014 06:10 PM
Water Droplets; My first go. Inspired by Peter Hartland timmypreston Foto Fair 7 31st December 2013 06:48 PM
First attempt at abstract water droplets bully74uk Foto Fair 7 8th October 2008 07:06 PM


All times are GMT. The time now is 11:10 PM.


© The Write Technology Ltd, 2007-2017, All rights reservedAd Management plugin by RedTyger