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Re: [OM] IMG: After the Fun

Subject: Re: [OM] IMG: After the Fun
From: Jim Nichols <jhnichols@xxxxxxxxxxxxx>
Date: Tue, 31 May 2016 09:46:46 -0500

Jim Nichols
Tullahoma, TN USA

On 5/31/2016 9:36 AM, ChrisB wrote:

The radial engine comparison: I assume that that is the change in prop speed 
with compression changes.


On 30 May 2016, at 22:50, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:

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. :-)

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