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General photography questions and answers: Discuss Lens Flare...Anyone confirm the part circle marks on the bottom left corner is down to flare or something Has appeared on ...
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Old 17-12-2006, 09:35   #1 (permalink)
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Lens Flare

Anyone confirm the part circle marks on the bottom left corner is down to flare or something



Has appeared on several pictures over the last two weekends..........seems to be on the ones shot through a 105mm Polariser.

Ignore the spots of rain
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Old 17-12-2006, 09:48   #2 (permalink)
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Re: Lens Flare

now as u know im no expert, but i wouldnt expect a flare when using a polariser??? and if its the same place have u checked the polariser? could it be a streak when cleaning it etc? i know a guy who thought his camera has goosed (technical term) but he hadnt cleaned the lens properly.

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Old 17-12-2006, 10:02   #3 (permalink)
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Re: Lens Flare

Polariser's have several uses and one is to help reduce flare (although that does not mean they will always completely eliminate it).

Its hard to tell from just the one shot however looking at where the rings are in relation to the main light source I would say that there is a 90% chance that this is nothing more than lens flare.

If you have other example shots that you could post I would be happy to form a revised opinion based on those too
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Old 17-12-2006, 10:11   #4 (permalink)
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Re: Lens Flare

Hmmmmmmm!.Looks like lens flare,but doesn't.You've got a strong light source in the opposing corner so it's a possibility.Try cleaning both the lens and filter.Also,if you are not already using one,try a lens hood as well.I use Ixos screen cleaning tissues for filters,and a Hama DigiKlear pen(Excellent!) for lenses.Hope that helps.
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Old 17-12-2006, 10:11   #5 (permalink)
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Re: Lens Flare

Thanks for the feedback

As the polariser sits several mm away from the lens in a filter holder am I right in thinking this would/could create lens flare?

I will post some more examples in a sec.
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Old 17-12-2006, 10:14   #6 (permalink)
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Re: Lens Flare

Yes the larger the gap between any filters and the front element of the lens the bigger your chances are of introducing more/extra lens flare. When I am using the Cokin lens system I always attempt to slot in the filters as close as possible to the lens and I am acutely aware of the extra flare this can sometimes introduce.
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Old 17-12-2006, 10:18   #7 (permalink)
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Re: Lens Flare

This is what I thought Steve.

I have the Lee system with the polariser set two filter slots away from the lens (if you know what I mean) which results in a substantial gap when it comes to lens flare I guess.
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Old 17-12-2006, 10:25   #8 (permalink)
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Re: Lens Flare

I have polerisers as screw in filters directly on the front of the lenses and the cokin system I use for special stuff like hard or soft grads, this I obviously attach to the front of the Polerisers. I have found it to be the best method to keep the maximun quality and minimise the flare.
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Old 17-12-2006, 10:28   #9 (permalink)
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Re: Lens Flare

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I have polerisers as screw in filters directly on the front of the lenses and the cokin system I use for special stuff like hard or soft grads, this I obviously attach to the front of the Polerisers. I have found it to be the best method to keep the maximun quality and minimise the flare.
Never thought of doing it that way.
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Old 17-12-2006, 10:36   #10 (permalink)
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Re: Lens Flare

Here's one other example.......

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Old 17-12-2006, 10:44   #11 (permalink)
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Re: Lens Flare

Is this shot through an ultrawide? The reason I ask is that I had a similar effect on my 17~35 at the wide end when I tried out an orange filter on it. I found that unscrewing the filter made the effect move and then I realised that the mount was so thick that the lens was recording the outer edge of the filter. Just a thought...
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Old 17-12-2006, 10:51   #12 (permalink)
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Re: Lens Flare

These were @ 16mm using a 16-35mm
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Old 17-12-2006, 11:45   #13 (permalink)
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Re: Lens Flare

I will stick to my original verdict and say definately lens flare.

To confirm it beyound doubt, next time you are shooting under similiar conditions take the same shot with and without the filter(s). The results should vary enough to confirm one way or another.
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Old 17-12-2006, 11:48   #14 (permalink)
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Re: Lens Flare

Quote:
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I will stick to my original verdict and say definately lens flare.

To confirm it beyound doubt, next time you are shooting under similiar conditions take the same shot with and without the filter(s). The results should vary enough to confirm one way or another.
Will do
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Old 17-12-2006, 19:23   #15 (permalink)
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Re: Lens Flare

I don't think this is direct internal lens flare but it is being caused in much the same way....

Because this filter is sitting a fair way in front of the lens proper, there is a reflection of the edge of the lens on the back of the filter which is then being transmitted through the lens to the sensor. This is why I think you are getting this problem.

The thing with filter holders like Cokin and Lee is that there is some light seepage around the side of the holder between the filter and the lens. Because this is at an acute angle, it doesn't usually cause a problem but in this case it clearly is. Try taking a shot with a thin strip of cloth tied around the end of the lens between it and the filter holder so that no light is able to ingress. This stops light that is travelling at an angle to the lens getting in and causing a reflection in the rear of the filter. That should solve the problem.

However, it isn't something you want to do on a permanent basis but at least if you try that and the ring disappears, you will know that is the reason for it.

I'll be interested to know how it goes so do give us some feedback on any experimentation you do P-E.

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Old 17-12-2006, 19:47   #16 (permalink)
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Re: Lens Flare

I'm with Rob on this, and it does look more like the lens is being reflected back from the Poloriser rather than internal reflections in the lens.

Again as rob says, try to stop any light getting around the sides, maybe in a technique that Steve mentioned earlier!
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Old 17-12-2006, 19:53   #17 (permalink)
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Re: Lens Flare

I have given the polariser a good clean and reduced the filter slots down to one.

I will give it some testing when I am next out and report back.......once again thanks for the suggestions/advice
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