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Thread: What is F-stop

  1. #1

    Default What is F-stop

    As I was reading the spec of x1.4 Teleconverter for DSLR camera, it mention that this unit will "Reduces lens aperture by one f-stop", would appreciate anyone can enlighten me what is it? what is the effect and what need to be done during photo shoot?

    Example: Nikon D70 with AF50mm F1.8 lense and AF-S Teleconverter TC-14E II. Does it mean the F1.8 becomes F2.8? Will the camera able to auto adjust?

    Thanks in advance.

  2. #2

    Default

    you may want to check if the teleconverter is compatible with your lens to begin with...
    happy shopping!

  3. #3

    Default

    Quote Originally Posted by poh6702
    As I was reading the spec of x1.4 Teleconverter for DSLR camera, it mention that this unit will "Reduces lens aperture by one f-stop", would appreciate anyone can enlighten me what is it? what is the effect and what need to be done during photo shoot?

    Example: Nikon D70 with AF50mm F1.8 lense and AF-S Teleconverter TC-14E II. Does it mean the F1.8 becomes F2.8? Will the camera able to auto adjust?

    Thanks in advance.
    a 1.4x tc will reduce yr effective f-stop (aperture) by 1.4 times (1 stop). so eg. if u set the aperture to f2.8, times by 1.4 it becomes a f4. if u set at f4, it becomes a f5.6. in other words u'll b shooting at f5.6 instead of f4 when the tc is fitted.

    similiarly for a 2x tc it doubles the f-stop. from f2.8 it becomes f5.6. however do ensure the tc is compatible for use with yr lens. otherwise it will not function properly. on some lens & tc combos u will lose yr AF ability as well.

    hope this helps.

  4. #4

    Default

    Thanks, but what will happen to shooting, will the camera know that it is fitted with Teleconverter? For example if I am using F2.8 Lense, the camera will show max F4, right? The camera should know and I will not end up with wrong exposure?

    Thanks

  5. #5

    Default

    this is because the focal lenght has change....thus the difference in "effective f-stops"

    camera auto adjust i take it to mean metering...if ya cam has TTL metering....no prob...the metering will still be correct if u follow the cam's build in system

  6. #6
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    Default

    Quote Originally Posted by Witness
    camera auto adjust i take it to mean metering...if ya cam has TTL metering....no prob...the metering will still be correct if u follow the cam's build in system
    bearing in mind that the TC is compatible with the lens used of course. no guarantees for third-party brands, especially when used cross-brand (e.g. Nikon lens, sigma TC, and vice versa).

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