Author Topic: [Theme] Lens Flare  (Read 81220 times)

Harald

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Re: [Theme] Lens Flare
« Reply #195 on: May 05, 2016, 19:33:14 »


Essen Rüttenscheid

I really provocated it... ;) (Nikon 50mm 1.2 Ai-S)
Some pictures on FLICKR

the solitaire

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Re: [Theme] Lens Flare
« Reply #196 on: May 05, 2016, 19:46:49 »
I know that corner of Essen quite well. Been there more then a few times. It's been 3 or 4 years now though that I last visited Essen.

Now here is some specialty flare, again from the 20mm f3,5 Nikkor-UD.

_DSC9084 by b j, on Flickr

This is without filter or any damage to the front element or dirt on the front element. I am not sure what causes this type of flare with lightsources just outside the frame.
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Bruno Schroder

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Re: [Theme] Lens Flare
« Reply #197 on: May 05, 2016, 22:32:35 »
That's an interesting one, Buddy. Dirt inside?
Bruno Schröder

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the solitaire

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Re: [Theme] Lens Flare
« Reply #198 on: May 06, 2016, 10:23:09 »
No dirt inside Bruno. I own about the cleanest copy of the 20mm f3,5 Nikkor-UD I have seen in person, and I know from someone who collects really clean samples and owns more then one copy of the lens that his copies exhibit the same behaviour. It seems to be a lens property in the 20mm f3,5 Nikkor-UD specifically. I know Chris Dees owns at least one copy of the lens so we might have him try getting the same effect with his copy. It is reproducable.
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Bjørn Rørslett

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Re: [Theme] Lens Flare
« Reply #199 on: May 06, 2016, 10:36:46 »
Flare resistance is not high on the list of the properties of the 20/3.5 UD. Let the consolation be that this lens flares 10x worse in IR!!

the solitaire

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Re: [Theme] Lens Flare
« Reply #200 on: May 06, 2016, 10:52:59 »
Now there is something worth giving a try! I did convert a D70s to IR some years ago. Would be interesting to mount the UD Nikkor on that and see if I can get some flare :)
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Bjørn Rørslett

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Re: [Theme] Lens Flare
« Reply #201 on: May 06, 2016, 10:58:56 »
Actually the 20/3.5 UD is an excellent performer in IR.  You just have to learn to deal with the flare and ghosts.

Björn Carlén

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Re: [Theme] Lens Flare
« Reply #202 on: August 27, 2016, 23:38:09 »
What do you call this particular type of flare?
(The Oly 12-40/2,8 PRO is not exactly suitable for shots of the sun at this angle.)
UFO-flare?
Björn Carlén
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Bjørn Rørslett

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Re: [Theme] Lens Flare
« Reply #203 on: August 28, 2016, 10:23:13 »
A combination of flare (around the sun and elsewhere, lowering contrast) and ghosts (from aperture/internal reflections, coloured & bright spots).

Apparently the lens used does not like to be pointed towards the sun.

Lars Hansen

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Re: [Theme] Lens Flare
« Reply #204 on: August 28, 2016, 14:22:55 »
Hope it qualifies.

Bjørn Rørslett

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Re: [Theme] Lens Flare
« Reply #205 on: August 28, 2016, 14:50:49 »
Hope it qualifies.

... borderline case ...

Your lens does show some flare around the sun, but unless you stop it down to its minimum aperture, the real presence of flare is hard to ascertain and differentiate from what effects heavy light overload causes to the sensor itself. 

Lars Hansen

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Re: [Theme] Lens Flare
« Reply #206 on: August 28, 2016, 14:56:31 »
Thanks Bjørn - lesson learned. This one was shot at f11 so it doesn't really qualify. 

Lars Hansen

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Re: [Theme] Lens Flare
« Reply #207 on: August 28, 2016, 15:05:22 »
Another attempt. Fuji XF 60 macro at f22. A bit boring shot but serves the purpose. Sorry for the color smearing/artefacts .. I put it through Color Efex Pro and I'm a newbie.

This shot revealed that my sensor is fairly dirty - at first I thought it was the lens, which is dirty, but not the culprit.

Bjørn Rørslett

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Re: [Theme] Lens Flare
« Reply #208 on: August 28, 2016, 15:57:39 »
The reason for shooting at minimum aperture is to reduce the size of the strong light source as much as possible. Usually that means you get "ray bursts" around say the sun, which we intuitively see as "true", perhaps subconsciously reminding of how we in childhood drew the sun (circle with rays coming from it).

The smallest size of say the bright sun will be provided by a lens with short focal length, because the size of the blur circles is proportional to absolute aperture (and accordingly, diminishes for a short focal length *and* aperture setting). Fisheye lenses are favourites because by definition most light entering such optics will be image-forming not stray light. This assumes an immaculately clean front element though.

Although longer lenses yield larger blur circles, one can still get nice light "burst" provided the light source is small enough, or effectively is blocked so only part of its light reaches the camera.

The attached images show some of these features. First, two old shots with a fast lens (Noct) at f/16. The lens does perform pretty well even for shooting into the sun, but some irregularities are evident, likely caused by dust on front. The solar disc is rendered more like a blob and ray bursts are not very evident. In the second picture, the sun is partially blocked by foliage, its disc is smaller, and now ray bursts show better.

Finally, a winter scene by the even longer 105/2.5 Nikkor AI. When the sun is blocked more efficiently like here, even better ray bursts are attainable.




Bjørn Rørslett

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Re: [Theme] Lens Flare
« Reply #209 on: August 28, 2016, 15:59:21 »
Another attempt. Fuji XF 60 macro at f22. A bit boring shot but serves the purpose. Sorry for the color smearing/artefacts .. I put it through Color Efex Pro and I'm a newbie.

This shot revealed that my sensor is fairly dirty - at first I thought it was the lens, which is dirty, but not the culprit.

The colour "smears" are interference patterns between sensor surface and internally reflecting surfaces of the lens.

The lack of dynamic range of the camera, in combination with some over-exposure, might explain the size of the sun blob.