Wide f/1.4 aperture outdoors question?

Discussion in 'Photography Beginners' Forum' started by burstintoflame81, Jan 14, 2010.

  1. burstintoflame81

    burstintoflame81 TPF Noob!

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    I am going to be shooting during the day outdoors, and want to use a shallow depth of field with my f1.4. However, I can only shoot at a max of 1/4000th of a second. If that is still overexposed, am I correct in thinking that I could use an ND filter? That way I can retain depth of field but cut down on the amount of light? Would a polarizer help as well ( how many stops do they typically cut? ).
     
  2. matt62485

    matt62485 TPF Noob!

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    depends, i think u can get them up to 3 stops but i may be wrong. u could still get pretty shallow DOF even at 2.0. so if u need to compensate some do so. or, use AP and do some exposure compensation
     
  3. burstintoflame81

    burstintoflame81 TPF Noob!

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    Yeah, I figured I might open just slightly to around 2. but it will be portrait work so I really want to make sure I have a good range on my Depth of Field and am not limited due to the environment. I have a circular polarizer and a 3x ND filter I could employ. Do polarizers have an adverse reaction to skin tones and stuff like that? I know they are usually used to cut reflection and brighten colors, but didn't know if they could be used for portraits too.
     
  4. Josh66

    Josh66 Been spending a lot of time on here!

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    1-2, or something along those lines. You could always just stop down a little too... Most lenses perform their best stopped down a little anyway.
     
  5. matt62485

    matt62485 TPF Noob!

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    cool, thanks for clarifying that. not sure why i thought i saw one -3 the other day :confused:
     
  6. Josh66

    Josh66 Been spending a lot of time on here!

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    Are you talking ND or CPL?

    I meant CPL. ND, you can get anything from 1 stop to 10 stops, probably more than that even.
     
  7. Dwig

    Dwig TPF Noob!

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    Yes, you need a neutral density filter if your images will be in color. A polarizer is, in addition to its polarization effect, approximately a 1 to 1.5 stop ND. Common ND filters come in 1, 2, and 3 stop increments. Stronger filters are available.

    A typical sunny day (summer, middle latitudes) requires f/16 at 1/100 sec with ISO 100. That means that at ISO 100, you T1i's lowest ISO, and 1/4000 sec the proper exposure on a sunny day will require f/2.8. It would require a 2 stop ND filter to allow you to use f/1.4 and with that there would be no "extra room" to allow for a overly light subject. You should probably look for an ND that is at least 3 stops (ND 8x using factor notation, ND 0.90 using density notation, see Neutral density filter - Wikipedia, the free encyclopedia).
     
  8. jubb

    jubb TPF Noob!

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    Make sure your ISO is on the lowest setting. I love using the lowest iso possible on all my shots anyways.
     

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