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10-16-2015, 11:59 AM   #1
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Flare shadow thingy

I have no idea what this phenomenon (look at the wrist, where the flare suddently cuts off) is called, so plz, bare with me

I must admit, I laughed when I read about Nikon D800 (I believe that was the camera) having this kind of problem - but now I am too. Thank you karma

So, exactly how normal is this kind of thing - this is the first time I've ever noticed this on any of my cameras.

The pic was shot using K-3 and Pentax DA 50mm f1.8 @ 1.8




10-16-2015, 12:36 PM   #2
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did you have any filters mounted?
10-16-2015, 01:36 PM   #3
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No, I never use filters except polarizing filters - but I wasn't using any of those that day.

I did have an after market lenshood mounted though - I just had a good look at it and it too shouldn't be the cause of any problems. At an angle, the lens' own indent to the first element blocks the view before the lenshood does.

I think it's exactly this one: Dorr 58mm Universal Metal Lens Hood - Hoods - Lens Accessories - Accessories - Harrison Cameras

10-16-2015, 01:51 PM   #4
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It looks a bit like light leakage. Check the mounting ring screws on the lens and camera body. They only need to be a tiny bit loose to let a sliver of light in.

10-16-2015, 02:03 PM   #5
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I doubt it's a leakage (but I'll check). I use that lens a lot and this photo is from about 2 months back now.

The sun is at low angle behind the bride, but not close enough to the frame. All the white stuff behind the bride is a lake, reflecting the sun and causing the flare.
10-16-2015, 02:08 PM   #6
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OK. In that case it might have been light reflecting off something just outside the field of view like glass, white car or chrome, etc. That would explain the hard edge at the bottom.
10-16-2015, 03:17 PM   #7
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Maybe it has something to do with the lens hood, or the back baffle. I doubt its the camera, but I may be wrong.

Still, its a beautiful photo of a beautiful woman, I don't think the slightly odd flare is a big problem
10-16-2015, 03:31 PM   #8
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Is it also possible it's a shadow cast on the subject from somewhere else and nothing to do with the lens or hood?

10-16-2015, 06:22 PM   #9
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QuoteOriginally posted by Zafar Iqbal Quote
I must admit, I laughed when I read about Nikon D800 (I believe that was the camera) having this kind of problem - but now I am too.
Yes, this is an issue for Pentax. However this effect is actually rather tricky to provoke in pentax SLRs. From the testing I have done there is a distinct pattern: it typically occurs with lenses with rear elements that are close to the mirror. I posted a thread on PF on this topic at the height of the D800 mirror box flare fiasco.


Pentax K5IIs with FA77 Limited @ f/8 on a tripod tilted 30 degrees upwards with a Pentax AF540FGZ flash firing at the camera.

This effect can occur from practically any angle:


Pentax K5IIs with FA77 Limited @ f/8 on a tripod turned 45 degrees from AF540 firing at the camera.

QuoteOriginally posted by Na Horuk Quote
Maybe it has something to do with the lens hood, or the back baffle. I doubt its the camera, but I may be wrong.
It's a complex interaction between the lens and camera but mostly: the mirror box itself is the cause of this issue. I have done exhaustive testing of nearly every camera I work with, and all SLRs do this to some extent. RF cameras with their short registration distance are effectively immune to this issue.


QuoteOriginally posted by officiousbystander Quote
Is it also possible it's a shadow cast on the subject from somewhere else and nothing to do with the lens or hood?
QuoteOriginally posted by jawsy Quote
In that case it might have been light reflecting off something just outside the field of view like glass, white car or chrome, etc. That would explain the hard edge at the bottom.
The statistical probability of either of these things happening is extremely small. The problem is the mirror box itself.

QuoteOriginally posted by officiousbystander Quote
Is it also possible it's a shadow cast on the subject from somewhere else and nothing to do with the lens or hood?
The problem isn't in front of the lens, it is behind it. The roof of the mirror box is deflecting the light, the lens is just filling in the shadow.

Last edited by Digitalis; 10-16-2015 at 06:52 PM.
10-18-2015, 02:22 PM   #10
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QuoteOriginally posted by Digitalis Quote
Yes, this is an issue for Pentax. However this effect is actually rather tricky to provoke in pentax SLRs.
Thanks for the input and you appear to be right on the latter part of that sentence - I've done tons of shooting with the K-3 II in different (not all) lighting condition and this shot is the first and only I've noticed it on.

I'm not too worried, but I was curious about it.
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