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From: Jim Nichols <jhnichols@xxxxxxxxxxxxx>
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Date: Mon, 30 May 2016 16:50:25 -0500
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Subject: Re: [OM] IMG: After the Fun
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Hi Chris,
I shouldn't have mentioned this, but thought you might have encountered
it when photographing aircraft. I did a little digging online, and
think I know what I am seeing.
I am assuming an idling prop on a PT-6 is at around 700 RPM. Let's
assume 900 to make the math simple. Without finding specific data for
my Fuji, let's use a generic refresh rate for the EVF of 60 cps. This
gives 4 image updates per prop revolution. This is roughly what I am
seeing through the EVF, even when not pressing the shutter release. The
thing it brings to mind is that of an old radial engine being turned by
the starter. I'm showing my age here. :-)
Jim Nichols
Tullahoma, TN USA
On 5/30/2016 4:28 PM, ChrisB wrote:
> Do you mean that it's distorted, Jim, as if by a digital shutter?
>
> If so, I'd assume that it was the quasi-shutter effect of the digital sensor,
> compared with a different action when taking a picture. Someone else will
> have a better idea, I expect.
>
> Chris
>
> C M I Barker | Gamlingay
>
>
>> On 30 May 2016, at 21:01, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
>>
>> One thing that I have noted, when photographing the Twin Otter, is that, in
>> the EVF of the Fuji X-E1, the props show up in a flicker mode. I assume
>> this is the interaction of the 700? RPM idle speed and the update cycle of
>> the EVF. Just a curiosity. :-\
--
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