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101 teaser

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Posted 19-03-09 at 03:06 PM by kennykodak
Updated 07-04-09 at 09:36 AM by Stephen

new photographers often ask, "what shutter speed should i use?" well we all know that the true answer depends on many variables. however for the new person who dared to switch off program to manual, i say this; the slowest or longest shutter speed that you can safely use hand held is 1/FL. as the focal length increases say from 50mm to 100mm so must the shutter speed be set to at least its equiliant. using standard settings, no less than 1/60 for a standard 50mm lens and 1/125 for a 100mm telephoto lens. most new photographers become confused because shutter speeds are presented as 60 or 125. these speeds are fraction and 1/125 is half the speed of 1/60 and NOT twice as long. more to come on this topic later but for now, keep this thought. almost everything in photography is ever double or half.

for you old salts who politely set thru this, thank you. did you know that if you were at an action event (i won't use cricket as an example since i don't understand it) but let's say a car race. for illustration let's say that a race car passes you at 80mph. if you take the speed of the subject (S) and then multiply it by a factor of 1.5 our new number would be 120. placing a 1 over our new number will produce a shutter that give a pleasing one foot of trailing blur to the subject.
1/Sx1.5 in this case 1/125. if you would like like 2 feet of blur, 2/Sx1.5 or 1/60. remember, when using a standard or normal lenses of 50mm, any longer exposure (such as 1/30) would require a tripod.
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Total Comments 4

Comments

  1. Old Comment
    Stephen's Avatar
    As a rule of thumb I have always tried to use the nearest shutter speed to the focal length I'm using ie 200mm would need 1/250s etc.

    However with IS/VR lenses being used or indeed in body image stabilisation, the rules have changed somewhat and its now possible to gain several stops on what you used to.

    Having said that, the principle of creating blur at a race event would not change using an IS lens.
    Posted 19-03-09 at 03:16 PM by Stephen Stephen is offline
  2. Old Comment
    kennykodak's Avatar
    Quote:
    Originally Posted by Stephen View Comment
    As a rule of thumb I have always tried to use the nearest shutter speed to the focal length I'm using ie 200mm would need 1/250s etc.

    However with IS/VR lenses being used or indeed in body image stabilisation, the rules have changed somewhat and its now possible to gain several stops on what you used to.

    Having said that, the principle of creating blur at a race event would not change using an IS lens.
    you are correct sir. (IS Canon)/(VR Nikon) will effect our body movement by up to two stops but has little effect on the subject in this scenario.
    Posted 19-03-09 at 03:24 PM by kennykodak kennykodak is offline
  3. Old Comment
    I'm trying to get my head around how this "rule of thumb" works for those of us using a DSLR with less than full-size sensor. I assume that this rule should be based on the actual focal length, not the "equivalent" once crop factor due to a smaller sensor is taken into account. Have I got that right?

    Regards,

    Neil
    Posted 20-03-09 at 10:01 PM by Cogito Cogito is offline
  4. Old Comment
    kennykodak's Avatar
    if you do not have a full frame sensor, you have a magnification factor. let's say that it is 1.3. if we took a traditional standard lens of 50 mm for 35 mm film or a full frame sensor, we must multiply it by this factor. 50 mm x 1.3 = 80mm.
    this lens will now function as a moderate telephoto. to get a standard view, we would have to select a wide angle lens by traditional standards and multiply it. 35mm x 1.3 = 45.5mm which is close enough.
    Posted 20-03-09 at 10:10 PM by kennykodak kennykodak is offline
 

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