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Dec 11, 2013 07:43:34   #
OK, so what does this all mean? How do you apply vanishing points if you were doing something like.......I don't know ...... taking pictures with a camera?
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Dec 10, 2013 14:13:15   #
I understand the 66 = 99 since it is an APS-C, so a factor of 1.5 makes sense. But isn't the 7100 also an APS-C. Are you using the same lens in each shot?
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Dec 10, 2013 14:07:54   #
There might be something here about lighting for fashion and balancing that with landscape in the same shot. Or something… I think the PR is just muddled. The message has not targeted a clear market for the book. Is there something particular that he thinks this book can teach?
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Dec 10, 2013 12:45:15   #
wwjd38 wrote:
Linda, my shutter speed was 1/25, and the camera was set on Shutter-Priority AE, the ISO was 200, and the Focal Length was 173.0mm, my white balance was set on cloudy.


Looking closer at the picture, I don't think you will have any trouble panning at a higher shutter speed. There actually appears to be a still spot in the center of the horse a little below the rider. If it really is still, it means you were following the horse just fine, but the motion of everything else was just too much for the 1/25.
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Dec 10, 2013 11:41:59   #
No. At those distances it is amazing. But I had a toy (the sigma hub) and wanted to see how far I could sharpen it. At all the normal distances it is awesome!!!
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Dec 10, 2013 11:23:52   #
mwsilvers wrote:
This lens has been tested and reviewed and is said to be quite sharp across the image even at f/1.8. How soft is it wide open?


I did not mean to over state the problem. And it is not softness. I still get a very tiny bit of front focusing at 1.8 35mm around 12 inches out. Without a card, it would be hard to tell.

I do love this lens!
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Dec 10, 2013 11:15:21   #
Shoot in shutter priority mode. With that much light you can shoot pretty fast 1/500th or higher. On the other hand a somewhat slower speed might still freeze the horse and still give you some motion blur in the background. It depends on the speed of the horse and a steady hand. Use a wide open lens to isolate the subject from the back ground.

Play with the speed and have fun.
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Dec 10, 2013 11:06:00   #
I like it! Would like to know, in general terms, what steps you took to get there!
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Dec 10, 2013 11:03:24   #
bunuweld wrote:
This may clarify the issue:
]As I hinted above, the Higgs field is a natural field for which the most natural parameterization implies &#10216;h(x)&#10217;&#8800;0. However, string theory and supersymmetric quantum field theories are full of additional counterexamples, the so-called moduli. The potential for the moduli is, by definition, zero (or universal constant) so any point is a stationary point. The physical properties of the vacuum and particles upon it depend on the moduli. For example, the coupling constant is often written as
g=exp(&#981;)
where &#981; is the so-called dilaton. It would be counterproductive to shift the value of &#981; in such cases because &#981; stores some important physical information. So moduli are other examples whose one-point function is nonzero in the most natural field redefinition.

Once again, it's always possible to redefine the fields so all of them have vanishing one-point functions in the vacuum
This may clarify the issue: br i As I hinted abo... (show quote)



THANKS! Finally a simple explanation I can apply to my photography!
:lol:
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Dec 10, 2013 11:00:55   #
David Popham wrote:
Already there are six pages commenting on this topic, so I doubt thT anyone be reading this note. What the hell, might as well toss one more stone into the pond.
There can be at lmost three vanishing points. A road has one vanishing point, one point perspective. A city block can have two vanishing points, think of a flat iron building bound by two streets. And a building can have three vanishing points, one to the left, one to the right, and one to the top.
I remember that we had to demonstrate all three in art class.
For my photography I don't give the concept any thought being more interested in leading lines and surfaces.
Already there are six pages commenting on this top... (show quote)


You may not need to give it any thought because you internalized it early in your training.
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Dec 10, 2013 09:38:47   #
Out of the box it was forward focusing on the t3i and needed a bit of adjusting, especially at the 35mm end. To be quite honest, I was a little bit happy that it needed adjusting. What good is a new toy, if you can’t play with it?! But, having done that, it is great!

When I get a FF (2014 I hope) I am thinking of picking up the Sigma 35 that a lot of people seem hot on.
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Dec 10, 2013 09:28:05   #
Wall-E wrote:
And you've actually done this?


Yes. I have done this. Not at a large competition, which I would leave to those hired to cover it. If you are doing it informally, and have been asked by the organizer you might be able to be on the edge of the dance floor and moving. Otherwise you have to work around the audience members, who have a right to see the performance minus your butt in their faces. If you are on a short step ladder (or stool or chair) you get a little height and avoid the viewers (unless you want them in the lower part of the frame.) And YES, I have used a step stool. I was at an Elton John concert recently and there was a photog running around in the good seats with a step stool taking shots of the stage! If it can be done in that kind of crowd you can do it in the relatively spacious environment of a dance competition or event. This approach also works at conventions and political rallies. Further, to take really good shots of a specified couple from the edge of the floor requires a lot of luck and skill. Being further back you can watch and frame your shots better. You can follow the couple and predict when they will enter a good spot.

On the other, if this is not a competition or an active ballroom setting it might be an annual recital held by a studio. If it is then the couple might have the floor to themselves. That would change the dynamic.

Also if you are considering trying to lighten the dark areas in post processing shoot in both jpeg and raw. You will get better results with the raw files when you try to bring up the background. Even if you have never shot raw before, you will still have the jpeg and can try working with the raw if you can’t get the results you want with jpeg.
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Dec 10, 2013 07:44:41   #
Rongnongno wrote:
One more try thought, I cannot believe no one understand.

If you stand between railroad tracks, how many lines are there?

If you tell me two you are wrong.

There are three. The two lanes created by the rail AND the one created by you looking far away.

The point you focus on in this instance is BOTH the focus point and the vanishing point.

Now stand on one rail and do the same thing. The vanishing point has not moved, why? Because you did and kept the same focus, you simply changes YOUR angle of vision..

Go to the other side, the vanishing point still has not. Why? Same as above.

The only constant is your point of view, the line you create while focusing and looking where the rails apparently meet, the vanishing point.

In the mean time what was around you was seen under three different perspectives. Why? Because the true vanishing point did not move. This is also why the perspectives vanishing point is NOT similar the single unique point created by your focusing onto infinity. These move from one side to the other FASTER that the true vanishing point. Once again, trigonometry and geometry is involved.

If you do not get that, I have no idea what will help you out.
One more try thought, I cannot believe no one unde... (show quote)


OK. Stick with the train tracks.

Now focus on a point half way between you and the vanishing point. Or better yet 2/3 of the way. Now the vaishing point and the focus point are different. What do you now have? Dynamic tension.

If you place an object (say a small child) at that 2/3rds point that stands so that a line drawn between your eye through the child's head hits the vanishing point, what happened to the tension? How about the head below that line keeping the focus on the head? Above it? to the left or right? Each arrangement provides a different level of tension.

Move the child to 1/2 the distance and 1/3 the distance and repeat the above arrangement of the geometric and focus lines. Now realign the points in each experiment with the nine standard focus points in your view finder. Each has a stronger or softer dynamic.

We could also go in to why a focus or vanishing point to the right side or left side are different, but that is cultural (and seems to be related to reading from the left to right, right to left, and up or down)
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Dec 9, 2013 14:41:41   #
Edinburgh,

It is hard to take a bad picture there. Have fun.
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Dec 9, 2013 14:26:57   #
jerryc41 wrote:
http://en.wikipedia.org/wiki/Vanishing_point


Excellent link. The vanishing point was the breakthrough concept for Renaissance art. I also think the example photo has a vanishing point formed by the arch of the horizon and the line of the clouds. It seems to sit at 1/3 from the bottom (on the horizon line) and 1/3 from the left side. The vanishing point is used to provide both depth and to draw the eye to a given spot (or to keep it from wandering aimlessly around the image.) It can be used in conjunction with DOF which serves the same function.
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