Tuesday, September 1, 2015

How to make bokeh photography

Original Bokeh is a Japanese word meaning 'blurred', so is the bokeh photograph photographs that highlight the characteristics of a main object of focus is very sharp while the background (or foreground) is very vague, or in English selective focusing. In the example above the beautiful photos (the work of Sector Two), the main object model face is very sharp, but the background is the door to look very blurry (motion blur). Well, nature is called bokeh blurred. How can so that we can produce bokeh like this photo.

The emergence of bokeh in the photo still want any moving picture is influenced by various factors
interacting, among others:

1. The distance between the main part of image / subject to background / foreground

Generally bokeh will look when the distance between the main object with background / foreground far enough. But distance is not a fixed variable in obtain bokeh, still influenced by other factors, as well as the good and bad bokeh.

2. Large aperture

Difficult to bring up the narrow aperture bokeh. Generally bokeh will look at large aperture provided background / foreground blur is not maximal. That is bokeh will look when the piece is still indistinguishable dark light or still have gradation.

3. Lens focal / focal length

The bigger the fire point of a lens, the more possible since the advent bokeh DOF increasingly narrow. The use of wide angle lens is very difficult to produce bokeh.

4. Type / design of the lens including the lens of pieces of material

Lens design does not directly affect the onset of  bokeh, but very effect on the quality of bokeh produced. But unfortunately, not high-quality lens necessarily produce good bokeh quality. Lenses with different corrections, which improve the sharpness of the image, it produces worse quality bokeh.

Lens reflex (Catadioptric lens), which include elements of the lens with a mirror, cause the typical ring-shaped bokeh, donut-shaped. This happens because the center of the cone of light is not blocked by the focus ring mounted mirror right in the middle circumference of the lens (the smaller the circumference of the mirror) 

Soft lenses, generally produce less good bokeh, because the center of each bokeh less soft than the point of interest, so we need special filters to fix it.
(Note: different from the soft out of focus in general) 

5. The number and shape of pieces / blade diaphragm
Number of diaphragm and pieces do not really have a direct link with the onset of bokeh, but only contributes to the shape bokeh. Most of the lens maker always linking number plate diaphragm with bokeh quality, and unfortunately accepted this opinion by most photographers, especially those who lack understanding of optical physics. in understanding they are, more shape of pieces, more better for bokeh. When in fact the many pieces of diaphragm just make bokeh more rounded shape, with consequences the more expensive lenses. There are other things about the pieces of the diaphragm is to know, ie the number of odd pieces of the diaphragm, can cause effects that are sometimes sought after photographers, the beam star-shaped around a very bright spot in the region out of focus. But generally appear the narrow aperture. The number of beam lines generated 2 times the shape amount, eg: diaphragm with a number of chips 5, will cause a star shape with 10 rays at each point of light. Diaphragm with an even number of chips just cause star shape with the number of jets equal to the number shape of pieces so that the diaphragm 8 pieces produce only stars with eight rays. But once again we must emphasized that it was only in form, not on the distribution of rays that cause bokeh.

Now i'll give tips how to make a bokeh photography :

  1. Use / set the camera on manual mode (Aperture Priority
  2. Use the aperture as much as possible, usually there is writing on the lens f / x, the smaller the aperture the greater x is.
  3. Calculate the distance to the object background images, if the distance to objects far background the importance of the photo is very blurry.
  4. Use of Non-Zoom lens with high aperture
  5. Many training course

Tuesday, June 5, 2012

New ways of taking photographs and feel by lytro

Competition in the world of photography has never stopped. Every company has a research division that determines the new innovation into the future of camera features. Innovation is not limited to professional cameras only. One is the magic Lytro camera, which frees us to choose the focus point even after the picture was taken.

The technology that brought Lytro is called light-field photography, where the camera works by collecting light from different directions and then processed by software on the camera as the 3D data of any kind to be photographed. This camera is only capable of producing approximately 1 megapixel images only.

Camera with the ability of these radicals are produced by a company from Silicon Valley and sells for USD 499 (about USD 4.5 million) for a model with a capacity of 16GB. As for the models with a capacity of 8GB priced USD 399 (about USD 3.6 million).

Lytro interface is very simple, it works the way the elaborate disguise. Control available is the power button and shutter, as well as a tiny strip to adjust the image magnification (zoom). Lytro also features a 1.5 inch touch screen that serves to target and control the exposure. Design Lytro so small and elegant, suitable for all levels of camera users. Although some of the complaints arose because the design is too small, that are found to be ergonomic.

Prepared, LSST Camera, Camera World's Largest

The world's largest digital camera, both physically and capacity, will be realized. Cameras that will be part of the Large Synoptic Survey Telescope (LSST) have now entered the design phase. This is the first step for the assembly will take two years.

This camera will take pictures of objects that exist beyond Earth. LSST will survey for three nights and took a picture which is equivalent to 800 000 with a capacity of eight-megapixel photos.

A total of 189 sensors and over 3 tons (2.7 tonnes) of components will be tightly packed into its cylindrical body. Work has already begun on the telescope’s 8.4-meter (27.5-foot) primary mirror, at the final site of the observatory on the Cerro Pachón ridge in northern Chile.

Plans for the LSST include studies on things such as dark energy and dark matter, detection of near-Earth asteroids, and analysis of the structure of the galaxy. Data will be available to anyone with internet access.

For three nights, the LSST will take as much as 30 terabytes of data every night. Camera capable of taking pictures with specs like that is a camera and weighs three tons and is capable of capturing an area 49 times the size of the Moon in a single frame. Wide and in this picture will catch every object that is close to the earth, from dark matter to dark energy.

DOE and the National Science Foundation who helped in the construction of this camera will be finished construction in 2014. Although still in the design phase, some small part started. Such as installation of a mirror of 8.4 meters and the construction of the telescope at Cerro Pachon homes, Northern Chile.

The LSST camera is designed to provide a wide field of view with better than 0.2 arcsecond sampling and spectral sampling in five or more bands from 400nm to 1060nm. The image surface is flat with a diameter of approximately 64 cm. The detector format will be a circular mosaic providing over 3 Gigapixels per image. The camera includes a filter mechanism and, if necessary, shuttering capability. The camera is positioned in the middle of the telescope. 1/2012 (Image credit: LSST Corporation)

Compare Nikon D3S vs Canon EOS-1D Mark IV


Compare Nikon D3S vs Canon 1D Mark IV
Nikon vs Canon, when they launched the most advanced and latest digital SLR cameras. As usual, when one of the launching of new products, then another one soon followed. This time it launched the first Nikon D3 successor version with a video feature called D3S and was followed the next day with new products from Canon EOS 1D mark called IV. Both are big DSLR with an integrated vertical grip, sturdy material wrapped in a magnesium alloy body, and both are equipped with HD movie feature.

this time based on the results of tests conducted by the Rev. Digital TV. In the case of high speed between the Nikon D3s with Canon Eos 1D Mark IV almost has the same quality. Then the feature is also a bit similar, whereas it is clear in terms of different colors ... D3s characters tend to be stronger in color while the Eos 1D Mark IV has a soft color results.

Both cameras are aimed for professional photographers, sports and journalism. As a professional camera, both of which offer very high sensor sensitivity up to ISO 102400.

Canon_eos1Dmark IV iso_12800
Canon_EOS_1Dmark IV iso_12800
Nikon D3S iso 12800
Nikon D3S iso 12800
Nikon D3S vs. Canon EOS-1D Mark IV Image Quality
The Nikon has a 12-megapixel sensor and the Canon has a 16-megapixel sensor. Looks like the Canon is better, right? Not so fast. The Nikon’s larger, full frame sensor and lower resolution means it has bigger pixels – much bigger (8.45 microns compared to the Canon’s 5.7 micron pixels). Bigger pixels mean less noise and one of the main specs both camera makers are pushing is high ISO sensitivity. Nikon has published sample images at ISO 6400 and they look wonderful. Canon has yet to publish any 1D Mark IV sample images but with about 30% less surface area on each 1D pixel, they’ll be hard pressed to match the low noise of the D3S.

The new CMOS sensor on the Canon EOS 1D Mark IV is still using the standard APS-H. Standard sensors are only used on professional SLR digital cameras are Canon's own 1.3x crop factor. Therefore, the EOS 1D Mark IV is not included as a full frame camera.

Significant changes are also done on the autofocus system. Autofocus system on the EOS 1D Mark IV evolved into a 45-point AF sensor with 39-point AF sensor in which a cross type sensor. EOS 1D Mark III only uses 19-point cross-type AF sensor type. Cross-type sensors are not centered in the middle of the camera alone, but spread evenly across almost the entire surface of the camera sensor. Thus, the focus distance can be determined more accurately.

In terms of high sensitivity at high ISO, the EOS 1D Mark IV capabilities competing with Nikon D3s. Both have the highest sensitivity up to ISO 102,400. However, the images taken at ISO 102,400 is quite impressive. If both are compared, the characters that appear in the image noise at high ISO fairly close together. ISO 3200 for quality of images produced for the EOS 1D Mark IV and Nikon D3s, as well. When using the ISO 6400, Nikon a little lead. However, the performance is quite inappropriate given the positive appreciation.

In terms of color accuracy, the results from the EOS 1D Mark IV is taken with auto white balance mode under daylight type of light source of a slight deviation of 6.8 DeltaE. Accuracy is slightly below the Nikon D3s. In kualita images, Nikon D3s superior to the Canon 1D Mark IV, but the EOS 1D Mark IV has an effective resolution of 16.1 Megapixels. With higher resolution it is able to cover up a little short on the EOS 1D Mark IV held in picture quality. EOS 1D Mark IV can perform continuous shooting speed of 9.7 fps.

Compare Nikon D3S and Canon EOS-1D Mark IV Camera Specs

 Nikon D3S  Canon EOS-1D Mark IV
 Sensor type  Full frame CMOS  APS-H CMOS (1.3x crop factor)
 Resolution  12.1 megapixels (4256 x 2832)  16.1 megapixels (4896 x 3264)
 Pixel size  8.45 microns  5.7 microns
 Sensitivity  ISO 200 to 12,800 – expandable to ISO 102,400  ISO 100 to 12,800 – expandable to ISO 50 and 102,400
 Burst rate  9 FPS (max resolution, RAW)  10 FPS (max resolution, RAW)
 Auto focus system  51 points with 15 cross-type sensors  45 points with 39 cross-type sensors
 Flash sync  1/250th second  1/300th second
 Exposure bracketing  9 frames in 1/3, 1/2, 2/3 or 1 stop steps  7 frames in 1/3 or 1/2, stop steps
 Battery capacity  Approximately 4200 photos  Approximately 1500 photos

Compare Nikon D3S and Canon EOS-1D Mark IV Video Specs

 Nikon D3S  Canon EOS-1D Mark IV
 Video resolution  720p (1280 x 720)  1080p (1920 x 1080)
 Video frame rate  24 FPS  30, 24, 25 FPS at 1080p / 60 FPS at 720p
 Video focus control  Single-shot contrast-detect auto focus with live touch-up AF  Single-shot contrast-detect auto focus (pre-focus) or manual focus
 Video exposure control  Auto and aperture priority  Auto and full manual
 Stereo sound  With optional external stereo mic  With optional external stereo mic
 Video file format  .AVI  .MOV

Some interesting things from Nikon D3S:

  • FX format (full frame) but relatively low resolution of 12 MP alone (full frame DSLR other brands have reached level 24 MP) so noise can be reduced as low as possible and the highest ISO ISO 102.4000 is still appropriate.
  • suitable for the pro who needs to capture high speed, thanks to a 51-point AF and 9 fps burst mode.
  • capable of recording 24 fps HD movie, FX-sensitive sensor capable of recording video while the ambient light is very dim.

The main things that was introduced on the Canon EOS 1D Mark IV:
  • APS-H format (1.3x crop factor) resolution of 16 MP
  • 45 point AF with 39 cross-type manifold including
  • dual Digic IV processor with 14 bit AD conversion
  • 1080i HD movie recording with 24 or 30 fps
  • very fast with a 10 fps burst mode

a comparison of the above can be concluded that they all - each brand has its advantages and disadvantages of - respectively. Nikon 3DS has the advantage in picture quality even though the ISO Noisenya little high, but lacking in quality HD VIDEOS, while the Canon EOS 1D Mark IV has a deficiency in the quality of the picture because it has plenty of noise in high ISO, while have a great quality in HD Video.

Tuesday, May 29, 2012

NHK Super Hi-Vision video camera with 33 Mega Pixel

Japanese TV company, NHK has developed a video camera 33 MP. This camera can record a new format Super Hi-Vision (7580x4320) which will surpass HDTV.

This tape recording average frames per second up to 120fps. The camera is able to capture about 4 billion pixels per second.

This increase in frame rate from 60fps to 120fps aims to capture fast moving objects. Capture frame rate is slow on the old camera can make objects appear blurred or blurry.

According to Mashable, the camera aims to maximize the video display on giant size screens. Frame rate can be drastically improved to ensure the image is always sharp.

Features of Super Hi-vision
- The system uses a video format with 7680 x 4320 pixels (16 times higher than standard Hi-vision, NHK’s HDTV system) . This world’s first video system with 4000 scanning lines delivers ultra-clear, realistic three-dimensional images that can be achieved only by ultrahigh-definition technology.
- The individual scanning lines are not visually noticeable even when relatively close to the screen, reflecting the high resolution of the system. What’s more, a wider viewing angle conveys a stronger sense of a reality.
- The new 3-D audio system with 24 loudspeakers dramatically enhances presence.

NHK in collaboration with the University of Shizuoka to develop a system of Ultra HD images. The sensor can handle the data as high as 51.2 Gbps. Analog to digital converter has been developed to process data from the pixels.

This camera uses a CMOS sensor 1.5 inches smaller and more efficient than the Ultra HD sensor. This device will also be the world's first camera that supports Ultra HD standard specification.

Based on data, NHK is now planning to increase the light sensitivity of the sensor is an ultra high definition.