16-45 weird night flare?

SMeK · 12-21-2010, 10:28 AM

is this normal? with my kit lens this was fully simetric and as you can see here on the right light is not. Is this normal for this lens? front and back elements are clean. ty:ugh:

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**blackcloudbrew** · 12-21-2010, 11:22 AM

This is generally a function of what f-stop you used than the specific lens. A general guideline is that you will get these types of flaring with f8 and above. It also mattes how many blades are in the lens as there will be a correlation between the number of points in the stars to the blades.

Many photographers want these types of effects in a shot like this. I think you did just fine with this.

Wheatfield · 12-21-2010, 11:56 AM

No problems there.

**Just1MoreDave** · 12-21-2010, 12:14 PM

I think what you're seeing is typical. The light on the right looks different because it's closer and bigger. The DA 16-45 has 8 aperture blades. Each aperture blade produces two diffraction spikes that make up the stars you see. When there's an even number of blades, the spikes overlap with spikes from neighboring blades. What might have happened here is the aperture did not form a perfect octagon, so the spikes don't exactly overlap. You might be able to tell if that's true with the lens off the camera, or take the same shot again at a series of apertures. The octagon might be more regular at one setting and your spikes will line up better.

KxBlaze · 12-21-2010, 12:22 PM

That is not a problem. It is something that people actually try to reproduce. As others have stated it is done with controlling the aperture.

SMeK · 12-21-2010, 03:27 PM

just to make sure you got what i was trying to say :-) this wasn't the case with kit lens. and that is ok as all of you saying? ty lol i am quite new in dslr photohraphy :-) also this one is f11

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KungPOW · 12-21-2010, 06:57 PM

Do you have a filter on the lens?

SMeK · 12-22-2010, 05:35 AM

no i don't have filter.. ?

woof · 12-22-2010, 06:12 AM

What I find more "interesting" in that second shot is the symmetric pattern of what looks like R/G/B spots or something within the flare. Look especially at the right side. What's THAT? A reflection off the sensor against the back of the AA filter... ??

SMeK · 12-22-2010, 06:20 AM

yeah maybe so but that is what k-x likes to produce.. i saw similar images but still i am not sure about this flare.. i have tried with my brothers k-x and same thing happening..

**Lowell Goudge** · 12-22-2010, 06:22 AM

What you see is diffraction caused by the octagonal shape of the aPerture and the intersection of the blades at the corners

You get one diffraction line per intersection point

**Just1MoreDave** · 12-22-2010, 09:28 AM

Originally posted by woof

What I find more "interesting" in that second shot is the symmetric pattern of what looks like R/G/B spots or something within the flare. Look especially at the right side. What's THAT? A reflection off the sensor against the back of the AA filter... ??

I wonder if the light has a lens on it that affects the results. If the light is pretty close and generating several "beams" of light instead of just one, that would affect the star shape.

SMeK · 12-22-2010, 12:42 PM

yeah i understand why is here star shape but my question was for part which is disconnected from star, where arow is..

KungPOW · 12-22-2010, 07:28 PM

Originally posted by SMeK

no i don't have filter.. ?

Because filters cause strange reflections when used at night.

In the second photo, any chance you shot that through a window?

It might just be the 16-45 is not a good lens to use for night shots. Zooms have more lens elements, and thus they get more flair issues.

What happens when you use a different lens under the same conditions? Do you still have the kit lens?

SMeK · 12-23-2010, 05:39 AM

i tried last night with kit lenst and with kit there is no that aditional flare...

12-21-2010, 10:28 AM	#1
SMeK Senior Member Join Date: Sep 2010 Posts: 150	16-45 weird night flare? is this normal? with my kit lens this was fully simetric and as you can see here on the right light is not. Is this normal for this lens? front and back elements are clean. ty:ugh:

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12-21-2010, 11:22 AM	#2
blackcloudbrew Loyal Site Supporter Join Date: Mar 2009 Location: Cotati, California USA Photos: Gallery \| Albums Posts: 4,461	This is generally a function of what f-stop you used than the specific lens. A general guideline is that you will get these types of flaring with f8 and above. It also mattes how many blades are in the lens as there will be a correlation between the number of points in the stars to the blades. Many photographers want these types of effects in a shot like this. I think you did just fine with this.

12-21-2010, 11:56 AM	#3
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,987	No problems there.

12-21-2010, 12:14 PM	#4
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	I think what you're seeing is typical. The light on the right looks different because it's closer and bigger. The DA 16-45 has 8 aperture blades. Each aperture blade produces two diffraction spikes that make up the stars you see. When there's an even number of blades, the spikes overlap with spikes from neighboring blades. What might have happened here is the aperture did not form a perfect octagon, so the spikes don't exactly overlap. You might be able to tell if that's true with the lens off the camera, or take the same shot again at a series of apertures. The octagon might be more regular at one setting and your spikes will line up better.

12-21-2010, 12:22 PM	#5
KxBlaze Veteran Member Join Date: Feb 2010 Location: California Photos: Gallery Posts: 1,602	That is not a problem. It is something that people actually try to reproduce. As others have stated it is done with controlling the aperture.

12-21-2010, 06:57 PM	#7
KungPOW Veteran Member Join Date: Nov 2007 Location: Vancouver, Canada Photos: Gallery Posts: 1,699	Do you have a filter on the lens?

12-22-2010, 05:35 AM	#8
SMeK Senior Member Join Date: Sep 2010 Posts: 150 Original Poster	no i don't have filter.. ?

12-22-2010, 06:12 AM	#9
woof Inactive Account Join Date: Nov 2007 Location: In the present Photos: Gallery Posts: 1,870	What I find more "interesting" in that second shot is the symmetric pattern of what looks like R/G/B spots or something within the flare. Look especially at the right side. What's THAT? A reflection off the sensor against the back of the AA filter... ??

12-22-2010, 06:20 AM	#10
SMeK Senior Member Join Date: Sep 2010 Posts: 150 Original Poster	yeah maybe so but that is what k-x likes to produce.. i saw similar images but still i am not sure about this flare.. i have tried with my brothers k-x and same thing happening..

12-22-2010, 06:22 AM	#11
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	What you see is diffraction caused by the octagonal shape of the aPerture and the intersection of the blades at the corners You get one diffraction line per intersection point

12-22-2010, 09:28 AM	#12
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	Originally posted by woof What I find more "interesting" in that second shot is the symmetric pattern of what looks like R/G/B spots or something within the flare. Look especially at the right side. What's THAT? A reflection off the sensor against the back of the AA filter... ?? I wonder if the light has a lens on it that affects the results. If the light is pretty close and generating several "beams" of light instead of just one, that would affect the star shape.

12-22-2010, 12:42 PM	#13
SMeK Senior Member Join Date: Sep 2010 Posts: 150 Original Poster	yeah i understand why is here star shape but my question was for part which is disconnected from star, where arow is..

12-22-2010, 07:28 PM	#14
KungPOW Veteran Member Join Date: Nov 2007 Location: Vancouver, Canada Photos: Gallery Posts: 1,699	Originally posted by SMeK no i don't have filter.. ? Because filters cause strange reflections when used at night. In the second photo, any chance you shot that through a window? It might just be the 16-45 is not a good lens to use for night shots. Zooms have more lens elements, and thus they get more flair issues. What happens when you use a different lens under the same conditions? Do you still have the kit lens?

12-23-2010, 05:39 AM	#15
SMeK Senior Member Join Date: Sep 2010 Posts: 150 Original Poster	i tried last night with kit lenst and with kit there is no that aditional flare...