Re: B+W 77mm UV/IR Cut (486M) MRC Filter
Re: B+W 77mm UV/IR Cut (486M) MRC Filter
- Subject: Re: B+W 77mm UV/IR Cut (486M) MRC Filter
- From: José Ángel Bueno García <email@hidden>
- Date: Mon, 27 May 2013 00:47:08 +0200
I'm sure that my old Minolta IV with its accuracy of 1/10 will stay with me
for years, but what kind of instrument you make use of to obtain 1/100?,
And what about 2dE asociated to a difference of 1/10 stop?.
Jose Bueno
2013/5/27 Ben Goren <email@hidden>
> On May 26, 2013, at 2:14 PM, José Ángel Bueno García <email@hidden>
> wrote:
>
> > But if you measure your working area with your photometer/flash meter
> with 1/10 stop accuracy and test with Imatest you will note that isn't
> enought accuracy.
>
> 1/10 stop works out to about 2 DE in the midtones, roughly. Significant,
> yes, but only barely.
>
> The thing is, even the best lenses have much more than 1/10 stop
> differential across the frame.
>
> 1/10 stop is more than plenty for the capture phase of things. You'll of
> course, no matter what, want to take a picture of a white field in the
> exact same setup and use that to take care of any and all residual
> unevenness in illumination. But trying to get your lighting more even than
> even a third of a stop is probably a waste of time, as even that's better
> than your lens.
>
> If it's inter-shot repeatability you're worried about, my experience with
> the Einsteins is that, shot-to-shot, there's less than 1/100 stop
> variability. No human is going to be able to spot the difference...but, if
> you're still worried, you can take multiple exposures and blend them in a
> stack in Photoshop with the blend mode set to median. It'll reduce noise,
> too...not that noise is a factor with proper exposures on modern cameras in
> studio settings. But it'll also protect you against one of the units not
> getting the signal to fire, which does happen every few hundred shots or so
> (depending on how noisy your RF environment is). Still, considering how
> cheap it is to fire off a few shots instead of a single one, it's good
> insurance.
>
> Cheers,
>
> b&
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