Like a shooting "pressure light" method.jvc bn-v712u battery The so-called "pressure light", just as its name implies is to use the light field environment of light removed, let background exposure is insufficient, and main body exposure accurate, let the day looks like night, morning or evening light shooting pressure, can let the people behind the sky color more full-bodied.
If want to take out during the day or night evening feeling, can use flash on characters flash photography, exposure metering result according to the correct exposure, such characters of the scenery behind and darkens, so as to achieve a wonderful light effect, and avoid mixed and disorderly background jvc bn-v812u battery influence subject.
What is a "flash sync"? The so-called "flash sync", is refers to the flash light in at the same time, the camera shutter the curtain the fully open supreme shutter speed, if flash light within the period, the curtain shutter not fully open, part of the screen will be shutter shade curtain form shadow and cause "flash sync".
Turn off the lights when flash photography of the character's light, and according to the correct exposure metering, so not be lit background was pressure dark, so as to make the feeling of night.
That "flash sync" makes the picture get sufficient exposure, the character by JVC GY-HM100U Battery light evenly.
Tag - BN-VF714
Friday, February 3 2012
Like using flash shooting on a night feeling
By bobo anthony on Friday, February 3 2012, 14:44 - JVC Battery and Charger
Wednesday, May 11 2011
What is a "red eye" phenomenon? How to reduce "red eye"
By bobo anthony on Wednesday, May 11 2011, 02:03 - JVC Battery and Charger
Since flash bulbs invention, "red eye" since flash photography JVC BN-VF815 Battery is a common phenomenon. Red-eye because camera flash light through the subjects eyes and enter retinal) reflex (caused by the camera. Because retinal vascular and display with red, so eventually images show the eyes are red subjects. Red eye phenomenon does not mean that the subject of filming eyes any problems.
"Red eye" phenomenon alleviate "red eye"
If flash actually very close distance lens in almost all small camera (is such), flash light can directly into the eyes and reflect back to the camera JVC BN-VF823U Battery. In addition, if the pupils dilate subjects (in dark interior), also increase the chance to appear red eye.
To reduce "red eye" phenomenon, please try to use the following skills:
Away from the camera, make flash, using the machine flash (if possible) can prevent light directly into the eye shot object, thus reducing red eye phenomenon;
Reflection flash, will flash, toward the ceiling to make light downy, prevent light reflection to directly from the eye lens;
Light, enhance, enhance indoor illumination around the pupil can make narrow subjects, in order to reduce red eye phenomenon;
Use a digital camera, the "reduce red eye" mode, in this flash mode, flash will be in several times before actual exposure flash light, thus narrowing the pupil subjects to reduce red eye phenomenon;
Subjects look, let the camera slightly off place.
See the camera's side can help to change the Angle of radial reflex, can relieve eye phenomenon sometimes these techniques may all cannot be eliminate red-eye phenomenon. In this case, can be in taking pictures with computer after the image editing software will its dispose of them. Nikon View 6 has strong eliminate red-eye function, it can let the photographer was photographed JVC BN-VF714 Battery by manually or automatically after way appear on subjects eyes removed the red eye phenomenon.
When the shooting animals may also appear "red eye", but because their eyes texturally different, reflecting light may be yellow, green or other colors. The above mentioned the same skills can also be used to eliminate the reflected light eyes produce animal. JVC BN-VF714U Battery
Monday, February 28 2011
On the constant aperture
By bobo anthony on Monday, February 28 2011, 09:00 - JVC Battery and Charger
Short answer:
1, JVC BN-VF815 Camcorder Battery constant aperture lens and fixed iris lens is different, the former refers to a zoom lens, the zoom process, its maximum aperture, or set the aperture and the current remain the same lens, which means that only a lens aperture size, which kinds of lenses are common in the past, but now almost impossible see. Heritage ah.
2, constant aperture lens, a common principle is that the location of the camera lens aperture film began, to the lens bottom of the last lens, the location of all the lens when the lens zoom, and focal plane distance remain constant. The general non-constant aperture lens, the position of the aperture when the zoom will be running around JVC BN-VF714 Camcorder Battery
But not all such lenses, the second principle is that a typical 4 4 zoom lens, the first film and the fourth lenses to form a convex lens in the normal sense, or a fixed focus lens, while at a concave lens is inserted between two lenses to change the virtual image distance in order to achieve the zoom, but the zoom will affect many things, so adding the fourth lenses, this move will lead to 2,3-lens aperture size and inclination of their For, as they affect the communication of light caliber.
So when moving the lens, aperture also changed.
3, aperture = aperture / focal length, but this is not absolutely correct. In addition, not the lens aperture diameter, the front of the lens mount diameter, or caliber, but a virtual, what does not exist, it is the above mentioned 2,3 months in a typical 4 4 zoom in zoom in charge of the two to achieve an opening angle between the concave lens, the inclination of the lens when the zoom will change.
In addition, the focal length is not correct to say, in fact, should be the image distance, not focal length ...jvc bn v408u battery
4, for a 135 SLR camera, if a shorter focal length, such as 20mm, so manufacturers have to adopt counter-telescope structure *, so that although the equivalent focal length is 28mm, but may actually be more than 70mm.
Do not you see, MA 20/2.8 aperture is only f2.8, but the diameter to 72mm, than the MA 100mm/f2.8 caliber (55mm) are big!
5, the macro lens macro trip into port, you will find the exposure combination is inconsistent with the theoretical aperture combination, especially when the zoom ratio of more than 0.5! Because at this time is much larger than the focal length of the image distance. So do not really think that the aperture size = aperture / focal length.
6, a number of lenses with a double-grating structure, such as the Minolta 135 STF and the 28-70G, the second grating will also affect the iris. 28-70G have exaggerated the first caliber, the fox that the second optical grating it may affect the pass, specifically do not know, because Fox had not seen again in addition to which it is a double-grating lens.
* Minolta and Nike have not adopted the structure of anti-ultra-wide-angle telephoto lens, but the bottom will hit the reflector, so when in use must be pre-rise to use such a reflector lens, similar to the paraxial camera. But at this time can not SLR viewfinder, you need to install a seat next to the flash axis of the viewfinder ... The metamorphosis is designed to be existed.JVC BN-V107U Camcorder Battery