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Optics Reference Guide

Reference Angle Reference Chart


Angular to Linear     |     Photometric Units     |     Linear to Angular

Angle Conversion

Degree Min Sec Rad Mrad Circumference Quadrant
1 Degree (°) = 1 60 3600 1.7453
x 10-2
1.7453
x 10-5
2.778
x 10-3
1.11112
x 10-2
1 Minute (') = 1.66667
x 10-2
1 60 2.9089
x 10-4
2.9089
x 10-7
4.6296
x 10-5
1.8518
x 10-4
1 Second (") = 2.77778
x 10-4
1.66667
x 10-2
1 4.8481
x 10-6
4.8481
x 10-9
7.71605
x 10-6
3.0864
x 10-5
1 Radian (rad) = 5.72958
x 101
3.43775
x 103
2.06265
x 105
1 103 1.59155
x 10-1
6.3662
x 10-1
1 Millirandian (mrad) = 5.72958
x 10-2
3.43775 2.06265
x 102
103 1 1.59155
x 10-4
6.3662
x 10-4
1 Circumference = 360 21,600 1,296,000 6.28319 6.28319
x 10-3
1 4
1 Quadrant = 90 5,400 324,000 1.5708 1.5708
x 103
0.25000 1

Angular to Linear

Angles Per Inch Per 10 Inches Per Foot
1 second .000005" .000048" .000058"
5 seconds .000024" .000242" .000291"
10 second .000048" .0000485" .000582"
20 seconds .000097" .000970" .001163"
30 second .000145" .001454" .001745"
1 minute .000291" .002909" .003491"

Photometric Units

1 Foot Candle = 1 Lumen/Ft2
1 Foot Candle = 10.764 Meter Candles
1 Candle = 1 Lumen/Steradian
1 Candle/M2 = 3.142 x 10-4 Lambert
1 Lambert = 2.054 Candle/In2
1 Lux = 1 Meter Candle
1 Lux = 0.0929 Ft Candle
1 Meter Candle = 1 Lumen/M2

Linear to Angular

Linear Measure Per Inch Per 10 Inches Per Foot
.000001" 0.206 sec. 0.021 sec. 0.017 sec.
.000025" 5.157 sec. 0.516 sec. 0.430 sec.
.00005" 10.3 sec. 1.03 sec. 0.86 sec.
.0001" 3 min. 26 sec. 2.06 sec. 1.72 sec.
.001" 3 mm. 26 sec. 20.6 sec. 17.2 sec.
.005" 17 min. 11 sec. 1 min. 43 sec. 1 min. 26 sec.




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Align Optics
4700 Hiatus Rd., Ste. 144-A
Sunrise, FL 33351

Phone: 954-748-1715
Toll Free 800-770-7320
Fax: 954-748-2149
Contact Us Form OR E-Mail: sales@alignoptics.com

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