d70 1/500th sync speed q's

Discussion in 'Beyond the Basics' started by goodoneian, May 10, 2009.

  1. goodoneian

    goodoneian TPF Noob!

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    i know that both the d70 and d70s (and d50 i believe?) have the capability of syncing at 1/500th of a second with flash, as opposed to the 1/250th that most cameras can (including my d300). this seems appealing to me to possibly pick up a used one for those tricky and bright situations where i don't want a ton of depth of field, but i have one question.

    since the d70/s iso low is 200, and my d300's is 100, doesn't wouldn't that negate the fact of being able to use a stop faster shutter speed? let's say in a hypothetical situation i'm using my d300 and my settings are iso 100, 1/250, and f/8. with the d70 at iso 200, 1/500th, wouldn't the exposure also have to be at f/8 still?

    i could be totally confusing my self haha, but if anyone could clear things up for me that would be apprecaited
     
  2. epp_b

    epp_b No longer a newbie, moving up!

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    The benefit is that it requires less flash power and therefore, the flash recycles faster, uses less battery life, etc.

    If you could sync all the way up to 1/4000th (which you actually can on the D70/D50/D40 by blocking the iTTL contacts; or on others with FP sync) and used ISO 1600, it would still be useful to have the extra sync speed because it requires even less power from the flash.
     
  3. Garbz

    Garbz No longer a newbie, moving up!

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    ISO like Aperture affect the input of light into the lens. Where as shutter speed affects the light recorded in a given time. Thus Aperture and ISO have a direct effect on flash power for a given photo, but since the flash duration is short it means that shutter speed will not affect the flash exposure at all.

    The higher shutter speed will thus allow you to darken the background in relation to the subject which may be lit by the flash. This is good but if your minimum ISO is 200 then the camera is more sensitive overall. The end result is that you need to drop your aperture size to compensate.
     
  4. goodoneian

    goodoneian TPF Noob!

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    hmm i think i may have been somewhat misunderstood, but that's my own fault since my original question was worded poorly. i'm fully aware of how aperture, iso, and shutter speed effect the picture when using flash.

    what i mean to ask is, isn't 1/250 @ iso 100 the same as 1/500 @ iso 200? i'm pretty confident that it is. so wouldn't there technically be no difference in using the d70/d50 as opposed to my d300? or am i missing something
     
  5. Garbz

    Garbz No longer a newbie, moving up!

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    What I was saying is that while it is true that for a normal exposure there is no difference, when you are using a flash you end up using half the power. ISO200 instead of ISO100 vs shutter speed which does not affect flash.

    Thus you get an additional stop latitude when using balancing flash against ambient light before your flash conks out. But you need to lower the aperture to take advantage of it, which goes against your depth of field requirement.
     
  6. JerryPH

    JerryPH No longer a newbie, moving up!

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    Yes it is the same amount of light... *without* the flash. With the flash at different powers you will have that difference in terms of shutter speeds that are not available on the other cameras that cannot sync higher than 1/250th. What Garbz said becomes pertinent when you are talking lightly lighter conditions where you do not want to raise ISO but still have a dark background while most effectively using your flash power settings.

    IE: You have a nice shot at ISO 100, 1/250th and F/8... but though your subject is well lit, your background is a touch too bright. If you riase ISO to 200, EVERYTHING rises, so you will need to now lower flash power 1 full stop to get the same results. Now... your background is still a little too obtrusive... raise shutter speed to 1/500th, background drops a full stop and things are the same as before... but now, take it one step further... set shutter speed to 1/1000th... suddenly things are just right plus your flash is putting out 1/2 the amount of light to accomplish the same subject lighting. Yes, th D70s can do that too (sync above 1/500th).

    See the interaction?
     
  7. tsaraleksi

    tsaraleksi TPF Noob!

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    Yes, you're right. 1/500, f/8, ISO200 = 1/250, f/8, ISO100, so the benefit of a faster sync speed is lost in that respect.
     
  8. NateS

    NateS TPF Noob!

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    Easy solve to your problem which I just did myself.

    If I understand correctly, you are wanting to let less light in during the day (i.e. faster shutter or lower iso) but still be able to use your flash sync. Also possibly to use a lower aperture outside and with flash than what you can currently do.

    Pick up a 3 stop (0.9) ND filter. I just picked up a Hoya HMC 3 stop ND filter to use outdoors. My reasoning is that I wanted to be able to darken the background (in broad daylight) and lighten the subject with the flash....can't be done with 1/200th. Throwing my 3 stop ND filter on and now my 1/200th is about the equivalent light as 1/1000 (May not be exact). This will let me 1....block enough light to not have a washed out background at 1/200 and 2....keep me from having to shoot outdoor portraits at f/16 to block enough light for shooting 1/200.

    Now I should be able to shoot f/8 or even larger in the sun without overexposing my background....light the subject with flash.

    I have only done some simple tests so far, but plan to get out and do some real shooting with the setup soon.
     
  9. epp_b

    epp_b No longer a newbie, moving up!

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    The calculations are correct, but your conclusion is wrong. The benefit is that the flash uses less power (recycles faster, batteries last longer, etc.)
     
  10. tsaraleksi

    tsaraleksi TPF Noob!

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    But that is the only benefit, versus the usual benefits of higher sync speed, namely, the ability to drown the ambient with a faster shutter instead of a smaller f/stop.
     
  11. goodoneian

    goodoneian TPF Noob!

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    okay i think i understand now. basically my only benefits would be that assuming with that hypothetical situation, at iso 100 and 1/250th i would be using full power, but with iso 200 and 1/500th i would be able to use half power? both apertures being f/8
     
  12. goodoneian

    goodoneian TPF Noob!

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    you pose an interesting point. a neutral density filter doesn't effect the power of the flash? this may be an obvious answer but i never though of that idea
     

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