Jump to content

frankie_frank1

Members
 View Profile  See their activity

  • Posts

    318

  • Joined

  • Last visited

 Content Type 

Posts posted by frankie_frank1

    sunset & sunrise

    in Nikon

    Posted

    "extremely danger to shoot the sun with slrs" ???

     

    Shoot the sun with pistol or rifle instead.

     

    It may not be a good idea to have long exposure, whether SLR or P&S cameras.

    sb 800 not firing

    in Nikon

    Posted

    If sB800's AF-Assist Illuminator doesn't work, camera's shutter is locked. To activate SB800's AF-Assist Illuminator, set camera to AF-A Auto-Servo or AF-S Single-Servo.

    Interesting Test?

    in Canon EOS Mount

    Posted

    The D3 when cropped down to a 1DmkIII size is the equivalent of a 7.4MP camera versus a 10.1MP, respectively. 1DmkIII wins.

     

    The D3 when cropped down to a D300 size is the equivalent of a 5.2MP versus a 12.2MP, respectively. D300 wins.

     

    The D300 when cropped down to a 40D size is the equivalent of a 11.1MP versus a 10.1MP, respectively. D300 wins.

     

    The D3 when cropped down to a 40D size is the equivalent of a 4.7MP versus a 10.1MP, respectively. 40D wins.

    Capture NX

    in Nikon

    Posted

    To reach 300,000 mark, it takes less than

    (1) 1% Americans

    (2) 0.23% Chinese

    (3) 0.27% Inidans

    (4) 0.05% world population

     

    300,000 isn't too hard to achieve.

    d40x and flash sync speed

    in Nikon

    Posted

    Angie, there was only 1 kind of shutter system before digital camera era: mechanical shutter. The fastest shutter speed is around 1/250th second. The latest electronic shutter can achieve speed of around 1/500th second.

     

    Most high end digial cameras still use mechanical shutters. P&S digital cameras use electronic shutters. D3, D300, D200, D80, D40X all use mechanical shutters (same as other brands' higher end products). D70, D70S, D50, D40 use electronic shutters or with conjunction mechanical shutters.

     

    There are 2 ways to transfer data out of the sensors: Interline Data Transfer and Full Frame Data Transfer. Interline Data Transfer uses electronic shutter; Full Frame Data Transfer use mechanical shutter.

     

    For Interline Data Transfer, CCD can itself control the start / stop of when it measures light falling on it, otherwise known as an electronic shutter, it does so by shifting values out of the photodiodes into "shift registers" then pushing all of that data out as a final image. The advantages to Interline Transfer CCD's are simply that, they can be controlled by software and don't require a mechanical shutter (though are often used in conjunction with one) and can produce a video feed output (a requirement for a live preview LCD feed). Because of the extra electronics required around each pixel the "fill factor" (size of the photodiode) tends to be quite small (about 30% of the pixel area). To get around this Interline Transfer CCD manufacturers place a layer of "microlenses" over the CCD to capture more light and focus it onto the smaller photodiode area which then gives them an better effective fill factor of about 70%.

     

    For Full Frame Data Transfer, they don't have a shift register, this means that a mechanical shutter is absolutely required to control the start / stop measurement of light. The shutter is opened and then closed again (say 1/60s later), the whole CCD shifts data off itself into the serial register where it's processed as the "RAW" image. As Full Frame CCD's are simpler (don't have shift registers and associated electronics around each photodiode) they have a much better Fill Factor (around 70%) and don't require or use microlenses. The disadvantage is that you can't get a video feed out of them which is the main reason we don't see more manufacturers using Full Frame CCD's (we're all too used to our LCD preview). Without microlenses, pictures dynamic ranges are higher.

     

    Long talk. Hope this does bore you.

×
×
  • Create New...