Subject: Re: Is there an easy way to stop this light scatter ghosting in allmy photos & videos of engine valves?
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From: PeterN <"peter,newdelete"@deleteverizon.net>
Newsgroups: rec.photo.digital,rec.video.desktop
Subject: Re: Is there an easy way to stop this light scatter ghosting in all
my photos & videos of engine valves?
Date: Fri, 15 Dec 2017 23:23:49 -0500
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On 12/15/2017 3:56 AM, Eric Stevens wrote:
> On Fri, 15 Dec 2017 06:23:18 -0000 (UTC), Arthur Wood
><arthurwood@bimmerfest.com> wrote:
> 
>> Eric Stevens wrote:
>>
>>> I think you mean cams rather than valves.
>>>
>>> It looks to me as though the highlighted parts give rise to a strak of
>>> light at an angle to the frame of the image. In some of the shots
>>> (e.g. bay 10) streaks can be seen emenating from highlights other than
>>> the cams. I suspect the problem may be due to a smear on the camera
>>> lens. I suggest you try it with another camera.
>>
>> You are correct in noticing that all the streaks of light are at the same
>> 45 degree angle no matter how the camera is held.
>>
>> That's why I think it may be some "physics" principle involved.
>>
>> There are many other photos taken with the same camera but under daylight
>> lighting where these streaks do not happen so it's not the camera.
>>
>> Some of those photos are here.
>> http://www.bimmerfest.com/forums/showthread.php?t=1181089
>>
>> And here:
>> http://www.bimmerfest.com/forums/showthread.php?t=1181289
>>
>> So it's not the camera or the lens except under those lighting conditions.
>>
>> I was assuming there is something weird in the physics of the lighting that
>> causes those sleet like streaks always at 45 degree angles and far from
>> being a mere reflection.
> 
> OK. That's one possibility eliminated.
> 

I think it's an issue of pint source lighting.

-- 
PeterN