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Find the distance of the following pairs of points. (a) (2, -1)and (-2, 3)

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At 300mm focal length at a distance of 200 yards away what F stop will give me edge to edge sharpness in my photos?

The edge-to-edge sharpness of your lens is a function of the optical design much more than f-stop. What I would be more concerned with is depth of field. The important consideration is what the closest and farthest point you want to be in focus. Here are some figures that might help. For a 300mm lens focused at 200 yards (600 feet), mathematical calculations yield the following (0.03 mm circle of confusion in all cases):

Near limit = 256' 3", far limit = infinity, total depth = infinity, hyperfocal distance = 447' 5"
Near limit = 303' 9", far limit = 24,350' 8", total depth = 24,046' 11", hyperfocal distance = 615' 2"
Near limit = 359' 2", far limit = 1,821' 3", total depth = 1,462' 1", hyperfocal distance = 894' 9"
Near limit = 403' 4", far limit = 1,172' 2", total depth = 767' 10", hyperfocal distance = 1,230' 4"
Near limit = 447' 4", far limit = 910' 12", total depth = 463' 8", hyperfocal distance = 1,757' 7"

Jan 22, 2015 | Nikon D3200 24.2 MP CMOS Digital SLR with...


Clean your TV Easy steps...

have you ever clean your tv?

The best way (in my own experience) is to have the following tools.
1.- a can of compressed air.
2.- a small vacuum cleaner (preferably a hand held).
3.- a mouth cover.
4.- a pair of latex gloves.
5.- a Philips (cross tip) screw driver.


-Put mouth cover and gloves on.
- remove the entire back of the TV.
- on one hand have the compressed air can and in the other the vacuum.
-start spraying the compressed air from a 6 inch distance and at the same time vacuum al the dust that starts flying around from the same distance.

on Mar 24, 2010 | Televison & Video

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Using gradient formula find the gradient joining each of the following pairs of points. C(5,1) and (8,3)

You only gave one pair of points so I assume you want a line going through those two points.
y = (2/3)x - 7/3

Jul 31, 2013 | Newmark Learning Common Core Mathematics...

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I am trying 2 get online with the ps3 2 play games. when i put it on settings and go 2 wireless then hit scan it comes up the access point was not detected...what does that mean?

Your wireless router should have a button that when pressed will sync up new devices. When installing your router, make sure you write down everything including your password/s. When the PS3 starts searching, press the button on your router to pair it with your PS3. If it doesn't connect, your distance could be too far or it could just be a weak signal. Suggested maximum range from PS3 to router is 20ft. If it doesn't display, try to configure it manually and type in your host name and then press your router button.

Apr 12, 2010 | Video Game Consoles & Games

1 Answer

I have a WRT300N router. I was wondering what the maximum distance that laptop with a WPC300N can be too still get a good signal?

We tested the router’s coverage at different distances and with different obstacles. We measured the signal level in five points:
Point 1: Near the WRT300N
Point 2: At a distance of 4 meters without obstacles
Point 3: At a distance of 5 meters + two thin gypsum wallboards
Point 4: At a distance of 6 meters + one brick wall, about 30cm thick
Point 5: At a distance of 17 meters + one thin gypsum wallboard and one 30cm brick wall
Here are the results...

Nov 21, 2009 | Linksys WRT300N Wireless Router

2 Answers

Bluetooth not picking up mp3

@psychurmine you may need to go into the settings of the actual music player application on your phone and tell it to output to headphones.

@ejr420hotora it could be several problems. Did you have it working at one point or is this your first time installing it? Is this your first bluetooth device or do you have others?

Feb 12, 2009 | Insignia Bluetooth Wireless Headphones...

1 Answer

Analytic geometry

assuming the question is what is the circle equation?
and if (-2,2) is the center of the circle
the equation should look like this: (x+2)^2+(Y-2)^2=R^2

And now only R is needed.

given 2x-5y+4=0 equation of line perpendicular

we can rearange the equation to be y=(2x+4)/5
from that we can see that the slope of the line is 2/5
And from the fact of perpendicular line we can say that the slope
of the radius line is -2/5.

The motivation now is to calculate the distance between the center of the circle to the cross point of the radius with the line perpendicular

For that we would calculate the radius line equation and compare it to the equation of line perpendicular

As mentioned earlier the slope of the radious line is -2/5.

So the equation is y=-2/5x+b and b can be calculated by using the center of the circle coordinates

2= - (2/5)*(-2)+b ------> b=2-4/5=1.2
radius equation is y=-(2/5)x+1.2

Now the cross point is calculated by comparing the equations:
-(2/5)x+1.2=(2x+4)/5 --> -2x+6=2x+4 --> 4x=2 --> x=1/2 --> y=1

So the cross point is (1/2,1).

The distance between the points is calculated by the following


Therefore the circle eq is (x+2)^2+(Y-2)^2=7.25

Oct 26, 2008 | Casio FX-115ES Scientific Calculator

2 Answers

Co-ordinate geomentry

get a sheet of graph paper. draw a line vertical and draw another line in the center perpendicular to the vertical. the meeting point is 0,0 - the upper right quadrant is X-Y. the bottom right quadrant is Y -X, the left bottom is -Y -X and what's left is -X +Y.
take your first coordinate. count up 2 and to the right 3. make a point. second coordinate - count up 4 and over right 1, make a point. now join the two points with a straight line. measure the distance between the points.

Dec 15, 2007 | Electronic Arts The Sims 2: Christmas...

1 Answer

Double vision

The distance between the centers of the eyepieces of your binocular must be the same as the distance between your pupils. This distance is adjusted as follows: 1. Focus on a distant object. 2. Pivot the two halves of your binocular farther or closer apart until you can see a single unobstructed, circular field of view. Make sure to focus on a distant object when you do this because when you focus on a close object you always see two slightly overlapping circular fields. Your binocular may have a scale on the top, between the eyepieces, to help you remember this setting.

Jul 03, 2007 | Bushnell Powerview - Compact 10 x 25...

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