On 2017-04-03 00:18:55 -0700, "Bob (not my real pseudonym)"
<invalid@invalid.invalid> said:
> On Sun, 2 Apr 2017 18:29:30 -0700, Savageduck
> <savageduck1@{REMOVESPAM}me.com> wrote:
>
>> On 2017-04-01 05:31:19 -0700, Mitchell Holman <noemail@verizont.net> said:
>>
>>>
>>> <image>
>>
>> The wrong assumpion was made regarding "making condensation rings".
>> Those are not condensation rings, but the yellow prop tips caught in
>> motion due to the "rolling shutter" effect with the camera being used.
>>
>> This is very common with cameras with rolling shutters of electronic
>> shutters. These days most noticable with cameras in smart phones and
>> current videoCams.
>> Here are some extreme examples of the same phenomenon.
>
> Must disagree. The image shows condensation vortices forming at the
> propeller tips in the moist ocean air. Technically, they are helices
> (spirals) rather than rings.
>
> An example I photographed 42 years ago (!) of an AC-130A taking off
> from McChord AFB.
>
> The phenomenon you describe can also be seen in older photos taken
> with film cameras with slower shutter mechanisms, causing propeller
> blades to appear bent.
>
> <image>
I guess we shall just have to agree to disagree.
Even in the photo you provided, you have demonstrated a shutter effect
rather than capturing prop induced condensation.
--
Regards,
Savageduck
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