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Controlling Vibration On Helicam – Aerial Photo Asia
Shaking – the photographer’s curse
Shaking is an issue with the intention of all aerial photographers have to manage, whether they utilize full-size aircraft, or radio-controlled models. In both cases, there is frequently an engine, whose vibrations can effortlessly discover their technique to the camera by the airframe, resulting in blurry photos. At the same time as it is potential to reduce blur through the operate of high shutter speeds, the effect is less latitude through option of film speeds and aperture settings. Why be forced to implement “fast” film that tends to be extra grainy and have a lesser amount of contrast? Why be forced to apply a wide-open aperture setting that will lower sharpness? (A lens commonly performs finest a a small amount of stops back from maximum aperture.) Lying on top of all of this, a vibration, if terrible enough, can still blur a photograph taken by a high shutter speed. It can also harm your camera. The ending: vibration control is imperative!
A closer look
How do we deal with it? Expert aerial photographers who utilize light planes commonly struggle to formulate certain that no part of their upper body is in get in touch with with the aircraft. In effect, they are using their torso as a shock-absorber. But you wish for to do aerial photography from your model, right? The necessary steps to control vibration rely on what sort of shaking is being created. If it’s a plane, we are challenging with shaking from the engine and propeller (which obviously ought to be balanced along with possible). This is a reasonably high frequency vibration. At a throttle setting of 12000 RPM, this equates to 200 Hz (cycles per second).
The circumstances with a model helicopter is more complicated. The vibration sources are engine, tail rotor and, worst of all, the main rotor. In a “sixty” dimension helicopter, these would be in the vicinity of 240 Hz, 150 Hz and 27 Hz respectively.
You can see that the main rotor is by far the lowest frequency source. Is this significant? Why not?, because low frequencies are the hardest to kill. We can all link up to the trouble of getting to sleep at what time the somebody in the building has their hi-fi cranked up, along with the whole you be able to hear is the bass. Just the bass gets through, because low frequencies are improved capable to defeat the inertia of mass – in this situation, the walls of your room. Vibration frequency
The same effects of frequency are observed while trying to isolate an object from a source of vibration. Think of a brick dangling from your hand via a heavy-duty rubber band. Move your hand up and down quickly, and the brick barely moves. Now move up and down slowly and the brick follows you. The low frequencies get throughout more without problems. Softness
Continuing our inspiration try out with the brick, here’s an essential point: the more weak the rubber band, the better the brick is protected from movement. However it also creates it harder to control. Imagine trying to hold a brick around with a long thin rubber band! We will return to this consideration very shortly.
Mass
Imagin if we drastically reduced the mass by replacing the brick by a sugar cube? We’d acquire that, with its extraordinarily low inertia, the cube would shift around very without difficulty. If we require to separate it from the movement of our hand, an tremendously thin rubber band would be required.
To review these points:
Frequency, softness also mass have an effect on the vibration isolation of the system.
Implementing this to our circumstances Nowadays to the digital camera. Mount it solidly to your helicopter or plane, as well as all the frequencies will obtain to it. Mount it instead with something slightly flexible, and you will create to remove the high frequencies. Possibly the engine vibrations will still get through, but they’ll be reduced in amplitude, and you will have smoothed out the “spikes”, that is, the nasty high frequency harmonics. This is the common result of commercially available engine mounts designed to reduce shaking. Soften the mount further, along with you’ll obtain to the end where the camera does not sense the engine vibration at all! The vibration movements are occurrence too fast for the soft mount to transmit them in addition to get over the camera’s inertia.
If it’s a plane, then all well as well as good quality. A helicopter, since we’ve stated, has extra lower frequencies. We tend to have to support the camera through a soft sufficient mount that will filter out all the frequencies down to that of the main rotor. This requires a softer mounting technique than a plane.
How soft?
Why not leave all the way, after that create a super-soft mounting system with plenty of thin rubber bands? This raises an important point. There is certainly a boundary to the amount of softness needed. The camera will begin to swing about, making aiming difficult plus potentially introducing motion blur. A compromise should be reached. Where is the proper compromise? The respond relies upon on the camera’s weight. For illustration, someone flying a light point-and-shoot camera will need a very soft, flexible attachment method to stop vibration (like the sugar cube). At the other extreme, if you arrange to carry a heavy medium format camera including a pan/tilt/roll mount and video assist, things are a bit distinctive.
A firmer mounting system will be acceptable, thanks to the high mass and resultant inertia of the system. The extra firmness will moreover be necessary to prevent the system from swinging excessively (like the brick).
Your next issue is probably “Well, how do I identify if that is excessively soft or too rigid?”
It’s simple to answer. Make it as soft as you are comfortable {with given the need to restrict unnecessary movement. Since a guidebook, you probably wouldn’t ever require your camera equipment to move more than an inch in any direction.
About the Author
This article has been contributed by Aerial Photo Asia (www.aerialphotoasia.com) as Professional Aerial Photography Services in Bali,Indonesia & Asia Region.This is a guide focused on the all things you should known about Aerial Photography using Helicam. If you are passionate about Aerial Photography then Sign Up to its RSS or FREE Digital wedding newsletter to receive more tips.
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