LED Ring – Part 3

Some months ago I posted that i’m building my own LED ring in order to get some nice closeup shots and have something special for portraits. The project was on hold for some time, but I got back to it, and now I have my first working prototype. Here two picture of flowers I took with the ring and my 17-40 mm.

Here I have also some shots of the ring itself. I already have some ideas of improvement. The mayor problem is that the ring is very long and on my 17-40 mm I can see the ring at 17-19 mm. Also I’ll go for SMD power LEDs to get even more light. Also a connection to the camera is mandatory. Maybe I’ll think of a E-TTL connection via a small micro controller.

Here are the other posts for my ring:
Part 1
Part 2

Frequency Measurement of Vienna

Update2: Because of the massive amount of traffic I received I had to disable the live measurement and block some IPs who where causing my server to slow down…

Update: Here are the measurements from the 20. of March, the day of the solar eclipse. And as you can see the grid operators were well prepared. The frequency was actually less fluctuating than the days before.

Frequency Measurements of the 18., 19. and 20. of March 2015

Today I decided to take again online my grid frequency measurement unit. In some days there will be a solar eclipse in Europe and maybe we will notice a slight fluctuation of the frequency during the eclipse. If it will be a sunny day, the shadow of the moon will race over the ground and will switch of the PV plants in Europe. The installed PV generation in Europe is according to this LINK 81,5 GW. But the overall installed power is more that 1300 GW.  So a black out will not happen.

But so far, have fun:


The grid frequency is a very important measurement factor of the grid. In the electric grid, the balance between generation and demand, due to the lack of a high number of storage, have to be equal at every time. The frequency is a performance indicator in which state this balance is. Lower than 50 Hz the generation is less than the demand, and vice versa. The frequency is therefore used to adapt the power output of power plants to the demand.

Parabola Theme and reCAPTCHA

recaptcha wordpress loginToday I installed reCAPTCHA to get rid of spam. The installation was really simple and I noticed really fast that my IP Blacklist plugin had a little time to relax. But I noticed that the login page look a bit odd. I googled a bit but didn’t find anybody whit the same problem. Also nobody answered in the google group about my question. So I researched myself and found the wordpress tutorial to change your login page.

I added the following to my functions.php, just to increase the size of the login page to 400px, and voila, better.

function custom_login_size() {
        echo '<style type="text/css">#login {width: 400px;}</style>';
add_action('login_head', 'custom_login_size');

I hope this can help you with your problems… 🙂

Best Time to Upload and Get Popular on 500px

UPDATE 3: recently 500px changed the website and you cannot see the number of likes anymore…

UPDATE 2: Now i’m continuing the test, but this time with an another account and a new picture. I’ll now wait the whole 24 hours period of 500px and upload only once a day.

Test Uploads, Score of the Picture according to 500px Pulse and the absolute Views/Likes/Favorites 
Date/Time 8 am 10 am 12 am 2 pm 4 pm 6 pm 8 pm 10 pm 12 pm 2 am
Monday  88.2
Tuesday 88.3
Wednesday 91.3
Thursday  87.7
iP  93.0
Sunday 60.1

UPDATE: I just stopped this test, because I realized, that the users rating is influencing the tests. When I was uploading normally my pictures before, the first Like was worth about 27 Pulse, the second something around 15 and so on. Whit my test is was upload 5-6 times per day the same picture. At the last day, a Like was worth 10 Pulse! With this, my test will deliver really bad results and completely destroy me repetition on 500px. I decided to slow down this test and upload the picture not so often anymore. Maybe I will use the whole 24 hours span of 500px to get the real rating.

I’m not completely sure how the algorithm works, but according to my findings, a click on Like is not worth 27 Pulse at all time and all users. Below, the rating of three pictures can be seen. (Sorry for German… 🙂 ) All of them have the same Likes and Favorites, but different Rating. All of them are from the “New” section at the same 10 minutes. And all of them had no comments. The first one is mine.  It seems that the view to like ratio does not influence the rating that much, since the third picture hat more views but a higher score. Whats left over, is the users rating. Correct me if i’m wrong!


Since some time I’m participate on 500px.com, to share my photos and get some feedback on the composition and processing etc. My choice felt to 500px.com because I don’t want to create an Yahoo account, I simply didn’t thought about Tumblr and I hate the iPhone majority on Instagram (yes, I have a rooted Android :P). Anyway, 500px offers with the rating system an interesting way of measure the, let’s say, “Beauty” of your pictures, compositions and processing. Also you can have the pictures still with a CC license (maybe the others have this as well, donno…). After I uploaded some photos I got exited. I was spending nights with watching other photos, like them and post some comments. On the other side my pictures get a relatively good rank and some nice comments. But, for high quality critics, go somewhere else. I had some nice rating over 90 and 95 also. 500px has a nice rating system called Pulse. If you want to sell pictures, a high rating, Pulse, is recommended.

Still my best one: The Battle of the Nations Monument in Leipzig.

When the days got longer, I had some time at the golden hour and blue hour to take some pictures.  I also had a new lens and I was still exited with my new 6D. I started photographing at 5 pm and ended at 9 pm or later. After that processing the pictures was not in my mood and I left that for the next day. So i stood up, made some processing and uploaded the pictures, let’s say, between 9:00 and 9:30 (CET) in the morning, three, four days in a row. I was really surprised that the rating where just around 70-80, sometimes less. Could it be that I’m, not like I thought a little bit good, really bad at photographing?

Photograph DC Tower Vienna by Thomas on 500pxBut I was going curious. I noticed also that the count of viewers where not that high like before. OK, no views, no likes, no rating. Even the best pictures of 500px have normally a 1-to-10 rating for “likes” to views and even less with “favorite“. So I made a simply test with one of my pictures. The photo on the right is the DC Tower in Vienna. Not the greatest picture, I know but a 80 worth for sure. The first time i uploaded this picture at around 9-10 AM CET, the pulse stood still after some hours, at around 70. The second time, I uploaded at 8 PM CET. And voilà, the pulse reached 90.7. Also the views where going from some under 100 to over 400. So there are clearly some good and bad times for uploading photos to 500px.

I decided to make a test with one of my newest pictures from Vienna. Also not a very good picture, but clearly worth a 80 or 85. I will upload this picture the next weeks to different time and will not interact with 500px at all, only to see the rating and the views after 2 hours and the upload to a different time again. I started today again at 9:30 AM CET. I’ll try to update this post recently to the latest results as soon as possible.


Test Uploads, Score of the Picture according to 500px Pulse and the absolute views
Date/Time 8 am 10 am 12 am 2 pm 4 pm 6 pm 8 pm 10 pm 12 pm 2 am
Monday 67.0
Tuesday  84.9 86.9
Wednesday 82.1  75.9 50.2  85.2 56.4 56,6/26
Thursday 65.6/34 68,6/24  69.8/35  58,5/21
Friday  39.6/8 iP


Clouds over Stuhleck – A HDR Time Lapse

Recently we were going to ski at Stuhleck in Austria. Or, better my girlfriend went skiing and I went to time lapse and HDR shots… I took three time lapses and some HDR shots. Two of the videos where really nice, the third went to crap because of two reasons. First, before setting up the camera to record I didn’t check about the memory card. I recorded my footage and went with the other camera around the mountain, after I cam back I noticed the memory were full. And second, I tried to photograph trough a hole in a tree, covered in snow, to have the sun moving on the sky. Nice idea but even with HDR everything was white and blur. Also the tree was moving a lot… Anyway here are the first two lapses in one Video.

For the HDR processing I used Luminance HDR 2.4.0 and, as usual, After Effects for processing the Video. I also tried to make some processing on two pictures for uploading to 500px but the rating was poor. A single picture I have to say looks boring but the moving clouds and light on the ground looks nice in the video.

Hyper Parliament- A Hyper Lapse of the Austrian Parliament

Yesterday I thought, enough with work, let’s go photographing! But the questions were: what? how? After a bit of sitting around I remembered the tutorial from gwegner.de (by the way, a really good site for tutorials and information) for hyper lapses. This video is in German, but here is also a nice one in English from digitalrev.com.

Basically, with every picture you move with the camera along an imaginary line and take a picture while aiming at the same spot on every picture. As described in the videos, you should use marks are already present, like stones on the ground or just use your step span. In any case this will produce a bit shaky footage, but this can be corrected in after effect. If you shoot in the night, and the are no clouds or stars visible, like in my video, the interval between the pictures is not important. But if you have something in the screen with a steady movement, like clouds, then use a intervalometer. In this video there is a very good description of that. Anyway, in my case i was just going a step forward, point, shoot, step forward, point, shoot…. 250 times. And done. The camera settings were 3.2 s exposure, f/4.5, ISO 100.

After that you have your footage, but this is really shaky. It is impossible to align the camera and the rest completely! But for this there is Adobe After Effects, if you have money, or Deshaker for Virtual Dub, if you don’t have money or just like Open-Source. In any case, the result looks really nice. In post processing I gave to the footage a little bit of a unnatural look, so it looks like rendered, but it is actually taken with a camera in 2 hours and another 2 hours for post processing.

In this video is also stated, that u don’t need fancy equipment like tripod, intervalometer and chalk marks on the ground for 1 km. It’s worth taking a look.

Night Sky Photography Shutter Speed Calculator

UPDATE: I’m glad to announce that I finally found the time to release the Night Fox Android App for my Shutter Speed Calculator!

Get it on Google Play

This is the shutter speed calculator for night sky photographing. Basically you just insert the data of crop factor, the megapixel you want to archive or your camera has, the focal length and the tolerance of pixels you can accept. The description of all these different factors is below. The description of the whole process can be found here.


Crop Factor
The crop factor is depending on your camera. It is influencing the field of view (FOV) of your camera, like the focal length also does. This calculator includes the factors 1 (3:2), 1.5 (3:2), 1.6 (3:2) and now also 2.0 (4:3). (Thx to Livio for the comment)
See also http://en.wikipedia.org/wiki/Crop_factor and http://en.wikipedia.org/wiki/Aspect_ratio_(image).

This is the amount of megapixels you want to achieve. It can be the maximum of your camera or also a lower Value. I included this value, because somebody may what to have the pictures not in full resolution, but a maximum of exposure time. With a smaller resolution I’m recommending to reduce the pixel tolerance as well.

Focal Length
The focal length is very important for the field of view and therefore how fast the stars are moving. The rule of thumb is “the lower the better”. But be aware of the speed of your lens. This influences the needed exposure time as well.

Pixel Tolerance
Depending on what you can live with, you can adjust this value. Basically it describes the tolerance of how many pixels a star can “move”. In some cases 20 pixels are OK, but for having really sharp stars, I recommend 10 pixel.

The Milky Way Exposure Calculator can be found here and as well as the other articles of http://www.lonelyspeck.com/.

Karawanken Mountain Chain Time Lapse

After New Years Eve we got an invitation for a short ski holiday trip near Klagenfurt. I was able to shot some nice time lapses from the Karawanken mountains. The clouds coming Italy seem to fall like water over the mountains. Also i go a nice day to night transition withe the moon as light source on the mountains. The day to night transition was made with LRTimelape 3. For this tool are a lot of tutorials available and the free version is more or less full featured, except that the footage is restricted to 400 pictures.

Creative Commons Lizenzvertrag
Karawanken Mountain Chain Time Lapse von Thomas leber ist lizenziert unter einer Creative Commons Namensnennung 4.0 International Lizenz.
Beruht auf dem Werk unter https://www.jamendo.com/en/track/654856/sombre.

Vienna at Night

After I posted the Special Shot Section of Vienna at Night, here now the normal section for the Vienna at Night shots.