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ZoranC Offline [X]
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Mark_EL wrote:
But I examined my results and came to the following conclusions....
At a shutter speed of 1/250, ODS settings have no influence. Hence, its not needed to change the ODS.
At a shutter speed of 1/500, the best result is at an ODS of 1.5 or 1.6ms.
At a shutter speed of 1/1000, the best result is at an ODS of 0.8 or 0.9ms.
At a shutter speed of 1/2000, the best result is at an ODS of 0.5 or 0.6ms
At a shutter speed of 1/4000, the best result is at an ODS of 0.3 or 0.4ms
At a shutter speed of 1/8000, the best result is at an ODS of 0.2 or 0.3ms.
I tested these shutter speeds @ 3 different power settings on the Quadra, first on maximum (which is 6.0), then one stop less (5.0) and after that another stop less (4.0). the optimal ODS settings as described above remained roughly the same regardless the power output.
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My ELB-400 arrived and I've played a little bit with it. After some casual shooting I can see how one _can_ take a shot with ODS off and not have gradient noticeable enough to ruin it, especially once it gets "masked" by uneven environment light, lens vignette, light positioning, modifier, and creative techniques, _HOWEVER_ that does _NOT_ mean 'off' was the best setting for ODS.
Test shots I did in less casual and more controlled manner confirm to me there _IS_, just like you said, an observable difference between ODS off and ODS set to optimal value so I don't have an explanation why Elinchrom tech support person said ODS 'off' worked best for him at all shutter speeds unless he used Nikon, and not Sony, for his testing (I hear Nikon out of the box does not need any ODS tuning).
I did not have time to test all shutter speeds across all power levels so my first round of tests was at 1/500 because your tests showed that speed would require biggest adjustment.
I tested it at power levels 6.0, 5.0, 4.0 and 3.0 and, just like you said, optimal ODS adjustment remained same across those power levels even though I could almost swear I have read somewhere that amount of ODS adjustment depends on power level of the flash.
Not having enough experience to judge best ODS setting based on look of file I judged it based on histogram. One with ODS setting I judged optimal was noticeably farther to the right. Which makes sense, whole point of being able to adjust ODS is so you can fine tune your flash and camera combo, it is just that I was thinking manufacturer would out of the box minimize the need for that, way it is with Nikon.
That is where some difference between your findings and mine starts. At 1/500 shutter speed best ODS setting for you was 1.5. For me it was, If I am correct in my judging, 2.0. _However_ that was with my transmitter/receiver set for "speed", not "normal" mode (I figured reducing anything that delays triggering helps). When I changed them to "normal" it was getting closer to your value but not completely.
Which makes me ask what are yours set at and if they are at "normal" what would be your optimal value when changed to "speed"?
Also, based on values you posted it seems that there is direct linear correlation between shutter speed and ODS value. It seems every time shutter speed doubles optimal ODS value halves. Do you see any logical technical explanation for it? If yes it might help explain why it is shutter speed related rather than always same value, and also help qucikly establish approximate optimal setting for any shutter speed.
And speaking of testing for gradation and best ODS setting what you would recommend as most reliable & foolproof way to test for them?
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Dec 27, 2017 at 11:40 PM |
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