Results 1 to 8 of 8

Thread: Question about TTL

  1. #1
    Member
    Join Date
    Sep 2005
    Location
    Northeast
    Posts
    332

    Default Question about TTL

    I'm new to flash photography...got alot more to learn. Just bought a SB600.
    Got some question regarding TTL.

    1) Does the TTL works with non Nikon Lens?

    2) Does metering affects TTL? ie. 3D Matrix metering, Center weighted and Spot
    Last edited by glay78; 3rd October 2006 at 11:50 PM.

  2. #2

    Default Re: Question about TTL

    Just bought a SB-800... Not too sure how to put it to effective use...
    - Non Nikon lens also can... Btw, that does not mean that ALL NIKON lens can too... Because the key thing is the CPU coupling...
    I am NOT a PROfessional photographer and photography is NOT my hobby

  3. #3
    Member
    Join Date
    Sep 2005
    Location
    Northeast
    Posts
    332

    Default Re: Question about TTL

    Quote Originally Posted by Youhong View Post
    Just bought a SB-800... Not too sure how to put it to effective use...
    - Non Nikon lens also can... Btw, that does not mean that ALL NIKON lens can too... Because the key thing is the CPU coupling...
    I'm still waiting for people to enlighten me

  4. #4

    Default Re: Question about TTL

    Generally yes.

    Non-D or non-CPU lens do not communicate the distance information for the metering though. But TTL will still work without the distance information... I think.

  5. #5
    Senior Member denniskee's Avatar
    Join Date
    Oct 2003
    Location
    bukit batok
    Posts
    5,468

    Default Re: Question about TTL

    TTL = through the lens.

    it means measuring the quantity of light that comes into the camera through the lens. doesnt depend on the lens. i mount a m42 screw mount lens on my slr, it still meter the scence. i mount a 1st party or third party af lens, it also show me same reading.
    photography makes one sees things from all angles.

  6. #6
    Member
    Join Date
    Sep 2005
    Location
    Northeast
    Posts
    332

    Default Re: Question about TTL

    Quote Originally Posted by denniskee View Post
    TTL = through the lens.

    it means measuring the quantity of light that comes into the camera through the lens. doesnt depend on the lens. i mount a m42 screw mount lens on my slr, it still meter the scence. i mount a 1st party or third party af lens, it also show me same reading.
    ic....thanks!!

  7. #7
    Member
    Join Date
    Mar 2002
    Location
    north
    Posts
    1,310

    Default Re: Question about TTL

    TTL is metering thru the lens. both ambient and flash. during film days, flash fire once cos flim is neutral grey in colour and the reflected light from the film falls on e sensors at the bottom ( remove the lens and you can see the sensors). thus, the mode you choose, spot, matrix etc affects the prosessing/choice of sensors used.

    now, in digital, since there is no film and the CCD captures light right on the spot, the light is not reflected back to the sensor. thus the flash ( like sb-800 has a preflash, this pre flash is the one that is bounced off the shutter curtain to be measured by the sensor and the the the 2nd flash is when the curtain opens.

    since the amount of flash is determined by amount of light bounce off, compensation is needed for extreme white of black object. e.g if you shoot a black cat, more flash power will emit cos the black doent reflect much light, thus to get a true black cat like it really looks, you may need to close down 1/2 a stop or more. experience w it.

    TTL will work with any nikon lens. cos the metering comes from the camera not the lens. just that AFD(distance) lens will feedback focusing distance and help camera determine exposure. personally don find AFD or AF have much difference


    hope this helps
    Last edited by surge; 6th October 2006 at 09:49 AM.

  8. #8
    Senior Member
    Join Date
    Aug 2005
    Location
    Tanjong Katong
    Posts
    3,710

    Default Re: Question about TTL

    Quote Originally Posted by surge View Post
    TTL will work with any nikon lens. cos the metering comes from the camera not the lens. just that AFD(distance) lens will feedback focusing distance and help camera determine exposure. personally don find AFD or AF have much difference
    IMHO, AFD or AF will not affect flash's TTL (or iTTL). Since any distance (or no distance) will not count into correct illumination calculation.

    Flash will do pre-flash, sensor receive feedback of pre-flash through lens, and determine what illumination power will sufficient for the scene, mirror up, aperture set, and "flash..." the amount of necessary power. Photo taken.

    Regards,
    Arto.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •