DSLR Basics: Aperture, Shutter Speed, and ISO
http://www.PhotoExtremist.com/ This photography tutorial shows you how to use a DSLR camera by showing the fundamentals (Aperture, Shutter Speed, and ISO) an...
DSLR Basics: Aperture, Shutter Speed, and ISO
Today more and more of the indoors are lit by fluorescent light sources. And that is why this topic of fluorescent light flicker is becoming more and more important to photographers. You might/might not have noticed that your videos may contain rolling dark bands, falsified colors or blackouts from frame to frame when you shoot them in fluorescent light. This is known as fluorescent light flicker normally termed as flickering. Many people normally confuse this flickering with the flicker or black rolling bar that occurs in frames when you shoot a video of your TV set or your computer monitor. But actually flickering has to do with fluorescent light sources.
Why flickering occurs:-
To understand flickering in video frames, we will first have to understand the luminance flicker in fluorescent lights. The mains frequency of commercial electrical power at which fluorescent lights operate, is standardized at either 50 Hz or 60 Hz (frequency at which alternating current is transmitted from power plant to end user) depending on geographical region. 50Hz AC (alternating current) changes direction 100 times per second as during every cycle out of 50, first current flows in one direction, then in the other direction. Similarly, 60Hz does so at 120 times per second. The luminance of the fluorescent lights fluctuates according to direction change of AC, instead of being relatively constant. So for example, as the commercial mains frequency in Europe is 50Hz, so fluorescent lights in Europe flicker at 100 times per second and as the mains frequency in US is 60Hz, so in the USA they flicker at 120 times per second. However, with tungsten filament lights the flickering is negligible because the tungsten stays glowing hot and thus giving light even when the current is momentarily zero.
Now, this luminance variation of fluorescent lights is not apparent to human eyes when one looks directly at a scene lit by fluorescent light because of the natural effect "eye persistence". Our eyes perceive such lighting as constant. But a videocamera is not able to perceive such persistence. Hence, if successive video frames are exposed during different periods of the cycle of AC, they will have considerably different luminance, and the resulting picture will therefore appear to flicker when projected. This happens if video frames are captured at a frequency which is significantly different from the AC power supply frequency. For example, in case we shoot a video with a frame rate of 60 FPS in a scene lit with fluorescent light operating at 50 Hz commercial power frequency, the brightness fluctuation of individual frames occurs resulting from the luminance fluctuation of the fluorescent light.
Solution:-
This flickering problem is solved by setting the frame rate of camera such that it should be a divisor of fluorescent light fluctuation rate. For example, for mains frequency equal to 60Hz, the fluorescent light fluctuation rate will be 120 and thus we should set the frame rate to 15, 30 or 60. This would mean limiting the exposure times of the sensor to multiples of the period of the AC power cycle, which lets the camera gather light over the duration of integer number of (n) flicker periods. This in effect averages the varying light level over the n complete flicker periods into one image, and since the frame rate is synchronized with the flicker rate, each frame has the same apparent light level. To facilitate this, cameras today come with anti-flicker control. You will need to remember to make the light frequency setting equal to the electrical frequency of the local main electrical system. For example, if a camera is set for operation in USA, which has mains frequency of 60 Hz, but the camera user travels to India, which has mains frequency of 50 Hz, then the camera user must change the light frequency setting of the camera to compensate for the different fluorescent lighting condition, or else suffer from flickering problem.
Where anti-flicker control is not preferred?
There could be cases however, where light levels may be very much brighter in which the required exposure time is lesser than one AC cycle. But such exposure times would not be effective in reducing flicker, because each exposure time would be only a partial AC cycle, and there is no guarantee that successive frames would be in the same part of the AC cycle. This is why anti-flicker modality in cameras locks the exposure time to a minimum of 100/120, and thus in very bright scenes, the user has to bear over-exposure to remain flicker-free.
All About Fluorescent Light Flicker in Cameras!
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All About Fluorescent Light Flicker in Cameras!
All About Fluorescent Light Flicker in Cameras! All About Fluorescent Light Flicker in Cameras!
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All About Fluorescent Light Flicker in Cameras!
All About Fluorescent Light Flicker in Cameras!
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[Speed Intro #10] + Tutorial
[Speed Intro #10] + Tutorial
Video Clips. Duration : 4.78 Mins.
[Speed Intro #10] + Tutorial
Read Please. Tweet it - bit.ly Playlist - full.sc Twitter - bit.ly Donate, Help me get better equipment - bit.ly I started these episodes just to upload something while i was waiting for my camera. My camera is here but ive gotten such a good response to these episodes so im going to keep on doing them. You can customize them as you like! :) includes (Ae File & the font & Footage)Win Rar Needed) Hope you guys like it. :) -Gunnar. Windows Intro: full.sc Mac Intro: full.sc WinRar: www.rarlab.com For free After Effects Trial visit. www.adobe.com Music Used: Unlimited Gravity - Lift Your Spirit Buy the song here - www.beatport.com Follow them at. ►Unlimited Gravity soundcloud.com facebook.com ►Prime Dub facebook.com soundcloud.com twitter.com --------------------------------------------------------------------------------------- Stalk me. YouTube - bit.ly Facebook - on.fb.me Twitter - bit.ly Vimeo - bit.ly Daportfolio - bit.ly UprisingDnB - bit.ly
[Speed Intro #10] + Tutorial
Ghost Recon Future Soldier - Gameplay Walkthrough - Part 13 [Mission 6] - LIVE LOUD
Ghost Recon Future Soldier - Gameplay Walkthrough - Part 13 [Mission 6] - LIVE LOUD
Tube. Duration : 22.03 Mins.
Ghost Recon Future Soldier - Gameplay Walkthrough - Part 13 [Mission 6] - LIVE LOUD
Ghost Recon: Future Soldier Walkthrough Part 13 with HD Xbox 360, PS3 and PC Gameplay by theRadBrad. Part 13 of my Tom Clancy's Ghost Recon: Future Soldier Gameplay Walkthrough includes Mission 6: Firefly Rain. Ghost Recon: Future Soldier Playlist: bit.ly Twitter: twitter.com Facebook: www.facebook.com T-Shirts: bit.ly This new Tom Clancy's Ghost Recon: Future Soldier Gameplay Walkthrough will include the complete Single Player Campaign Story Mode, all Missions, a Review and the Ending. Tom Clancy's Ghost Recon: Future Soldier (previously known as Tom Clancy's Ghost Recon 4) is a video game published by Ubisoft. GR: FS is a third-person cover-based shooter; however, aiming down the sights will cause it to switch to a first-person camera for more precise aiming. In addition, cover is partially destructible and fire from enemy machine guns will cause an FOV reducing 'suppression' effect. The game will be a futuristic take on the Ghost Recon series. As Kozak of the the 20-man Ghost Squad, the player and his/her squad of Pepper (machine gunner), 30k (reconnaisance expert), and Bones (engineer), fight Russian ultra-nationalists in Norway, Africa, the Middle East, and China.
Ghost Recon Future Soldier - Gameplay Walkthrough - Part 13 [Mission 6] - LIVE LOUD
Ghost Recon Future Soldier - Gameplay Walkthrough - Part 13 [Mission 6] - LIVE LOUD
16x9 - The Suicide Tourist: Assisted suicide documentary
16x9 - The Suicide Tourist: Assisted suicide documentary
Tube. Duration : 9.73 Mins.
16x9 - The Suicide Tourist: Assisted suicide documentary
A documentary by an award-winning Canadian filmmaker captures an assisted suicide on camera. Mary Garofalo reports.
16x9 - The Suicide Tourist: Assisted suicide documentary
16x9 - The Suicide Tourist: Assisted suicide documentary
IGDaily - Notch vs. Yogscast, Game Releases, Trailers - 11/22/11
IGDaily - Notch vs. Yogscast, Game Releases, Trailers - 11/22/11
Video Clips. Duration : 4.58 Mins.
IGDaily - Notch vs. Yogscast, Game Releases, Trailers - 11/22/11
www.youtube.com Click here to watch IGDaily - Skyrim Patch, MineCon, CS:GO, Tomb Raider - 11/21/11 IGDaily - Notch vs. Yogscast, Game Releases, Trailers - 11/22/11 Best Link Ever: youtu.be Kovic and John spent the night in the Machinima Office and caught some weird and freaky shit on camera. Who knows what lurks in the deep dark corners of Machinima. Though it's probably just Sark. Twitter: www.twitter.com Facebook: www.facebook.com Newsletter: www.insidegamingdaily.com Blog blog.machinima.com - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This video will show you... HOW TO craft HOW TO catch ghosts HOW TO be extremely tired - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Like Machinima on Facebook! facebook.com Prove your gaming skills on the Respawn Army app therespawnarmy.com FOR MORE MACHINIMA, GO TO www.youtube.com FOR MORE GAMEPLAY, GO TO: www.youtube.com FOR MORE SPORTS GAMEPLAY, GO TO: www.youtube.com FOR MORE MMO & RPG GAMEPLAY, GO TO: www.youtube.com FOR MORE TRAILERS, GO TO: www.youtube.com TAGS: IGDaily Machinima Inside Gaming Daily IGD Adam Kovic Minecraft Paranormal Activity Livestream Xbox 360 Dashboard Goes Live December 6th Cloud Storage Kinect Yogscast Vs Notch Minecon Drama Game Releases of the Week The King of Fighters XIII 13 Serious Sam BFE Batman Arkham City Sonic Generations WWE 12 Trailers Jak and Daxter HD COllection Spec Ops Mass Effect 2 Punch Keepin it Real Skyrim Theme Twitter Facebook ... IGDaily - Notch vs. Yogscast, Game Releases, Trailers - 11/22/11
IGDaily - Notch vs. Yogscast, Game Releases, Trailers - 11/22/11
How to Move LG enV Touch Pictures to Computer - Transfer Photos and Video From LG VX11000
On a recent outing to a local orchard, my daughter and I enjoyed a visit and lunch with my Mother-In-Law. The lunch was delicious, the weather was delightful, and the scenery was exquisite. Wanting to capture the beauty of the floral and fauna of the greenhouse where we enjoyed our lunch, I asked my daughter to use my LG enV Touch camera to capture images of the beautiful flowers that surrounded us. The idea was to be able to transfer them to our PC and enjoy and share them with other family members.
How to Move LG enV Touch Pictures to Computer - Transfer Photos and Video From LG VX11000
Gaming News - Xbox 720 Getting a Tablet Controller? & Sonic & Sega All Stars Racing 2 Confirmed
Gaming News - Xbox 720 Getting a Tablet Controller? & Sonic & Sega All Stars Racing 2 Confirmed
Video Clips. Duration : 11.37 Mins.
Gaming News - Xbox 720 Getting a Tablet Controller? & Sonic & Sega All Stars Racing 2 Confirmed
RUMOR Xbox 720 May get a TouchScreen Controller: www.ign.com Sonic and Sega All Stars Racing 2 Confirmed: www.tssznews.com Metal Gear Solid Snake Eater 3DS Demo Coming to Eshop this Thursday: mynintendonews.com Miyamoto Has Enjoyed Developing Pikmin 3 for Wii U: mynintendonews.com New Camera I've Ordered: www.amazon.com
Gaming News - Xbox 720 Getting a Tablet Controller? & Sonic & Sega All Stars Racing 2 Confirmed
Gaming News - Xbox 720 Getting a Tablet Controller? & Sonic & Sega All Stars Racing 2 Confirmed
Gaming News - Xbox 720 Getting a Tablet Controller? & Sonic & Sega All Stars Racing 2 Confirmed
After taking and saving the photos to the microSD card, we were immediately able to enjoy the colors and beauty of our surroundings. I was anxious to return home and see the images on my computer monitor and to share them online with family and friends.
Video Camera
How to Move LG enV Touch Pictures to Computer - Transfer Photos and Video From LG VX11000
I've used the camera on my LG enV Touch before and have been very satisfied with the ease of use, the quality of the photos, and the transfer process. The frequency that I use the camera and transfer the photos is infrequent though, so I thought I'd write the steps down and share them here in this article.
How to Move LG enV Touch Pictures to Computer - Transfer Photos and Video From LG VX11000
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Steps to Move Pictures From Cell Phone to Computer
Before taking a picture, you will want to either change or make sure your camera settings are in place for saving to your external memory card. At the end of this article is a link which provides steps for changing the camera setting to use the external memory.
Following are the steps I took to transfer the photos from the LG enV Touch MicroSD card to my computer.
These instructions assume the following: use of the camera on an LG enV Touch VX11000 cell phone, capturing and saving photos or video on an external memory microSD card, and transferring the photos using a SD adaptor.
Remove the MicroSD card from the lower right hand side of the phone by gently pressing the card in toward the phone.
Slide the MicroSD card into the SD card adaptor
Place the SD Card adaptor into a SD port or reader whether it be located on a laptop, PC, printer, or standalone external reader
Using Microsoft Explorer,locate the external memory card, Mine reads SD Card
Double click on the drive name and find your photos or video.
Highlight the photo or video files you want to copy or move
Ctrl-C to copy, or Ctrl-X to move
Locate the folder or location on your PC where you want to store the image or video files and type Ctrl-V.
Your images are now on your laptop or PC and are accessible for printing, sharing, embedding, editing, or viewing.
How to Move LG enV Touch Pictures to Computer - Transfer Photos and Video From LG VX11000
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Jodie Foster's Moving Acceptance Speech At 2013 Golden Globes | Life Time Achievement Award
Jodie Foster's Moving Acceptance Speech At 2013 Golden Globes | Life Time Achievement Award
Video Clips. Duration : 6.78 Mins.
Jodie Foster's Moving Acceptance Speech At 2013 Golden Globes | Life Time Achievement Award
Jodie Foster Golden Globes 2013 - Jodie Foster had the Golden Globes audience on the edge of their seats as she accepted the special Cecil B. DeMille Award. She began by thanking Robert Downey, Jr., who presented the award to her, but quickly went off in a more personal direction, hinting that she was about to announce something big. "So while I'm here being all confessional, I guess I just have a sudden urge to say something that I've never really been able to air in public... a declaration that I'm a little nervous about... but I'm just going to put it out there, loud and proud. And I'm going to need your support on this. I am, uh... single." After the laughter and whistling died down, Foster sort-of clarified her intentions, saying "I'm not going to do a big coming out speech tonight. Because I already did my coming out speech about a thousand years ago, back in the stone age." Foster went on to lament the reality TV culture that forces every celebrity to make their personal life public. "You guys might be surprised, but I am not Honey Boo Boo Child." By the end of the extended speech, every celebrity the camera panned to in the audience had tears in their eyes. Even if they couldn't follow every twist and turn in Foster's speech, it clearly had a major impact on everyone in the room. Watch video below, via NBC:
Jodie Foster's Moving Acceptance Speech At 2013 Golden Globes | Life Time Achievement Award
Jodie Foster's Moving Acceptance Speech At 2013 Golden Globes | Life Time Achievement Award
