Relationship between Screen Size and Projection Distance

 

Screen size at 4:3

 

Zoomed projection distance

 

 

 

 

 

 

 

 

 

 

 

 

Screen size at 16:9

 

aspect ratio

 

Max.

 

 

Min.

 

 

 

 

 

H1

 

 

 

H2

 

 

 

 

aspect ratio

 

W x D (cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W x D (cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40σ 81 x 61

 

2.0 m

 

 

1.2 m

 

55 cm

 

 

6 cm

37σ 81 x 46

 

 

(6.6χ)

 

 

(3.9χ)

 

(1.8χ)

 

 

(0.2χ)

 

50σ 102 x 76

 

2.5 m

 

 

1.5 m

 

 

 

 

69 cm

 

 

8 cm

 

 

 

46σ 102 x 57

 

 

 

(8.2

χ

)

 

 

(4.9

χ

)

 

 

 

 

(2.3

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(0.26 )

 

 

 

 

 

 

60σ 122 x 91

 

3.0 m

 

 

1.8 m

 

 

 

 

82 cm

 

 

9 cm

 

 

 

55σ 122 x 69

 

 

(9.8χ)

 

 

(5.9χ)

 

(2.7χ)

 

 

(0.3χ)

 

70σ 142 x 107

 

3.5 m

 

 

2.1 m

 

 

 

 

96 cm

 

 

11 cm

 

 

 

64σ 142 x 80

 

 

 

 

 

χ

 

 

(6.9

χ

)

 

 

 

 

(3.1

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(11.5 )

 

 

 

 

 

 

 

 

 

 

(0.36 )

 

 

 

 

 

 

80σ 163 x 122

 

4.0 m

 

 

2.4 m

 

 

 

 

110 cm

 

 

12 cm

 

 

 

74σ 163 x 91

 

 

 

 

χ

 

(7.9

χ

)

 

 

 

(3.6

χ

)

 

(0.4

χ

)

 

 

 

 

 

 

(13.1 )

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90σ 183 x 137

 

4.5 m

 

 

2.7 m

 

 

 

 

123 cm

 

 

14 cm

 

 

 

83σ 183 x 103

 

 

 

 

 

χ

 

 

(8.9

χ

)

 

 

 

 

(4.0

χ

)

 

 

(0.46χ)

 

 

 

 

 

 

 

 

(14.8 )

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100σ 203 x 152

 

5.0 m

 

 

3.0 m

 

 

 

 

137 cm

 

 

15 cm

 

 

 

91σ 203 x 114

 

 

(16.4χ)

 

 

(9.8χ)

 

(4.5χ)

 

 

(0.49χ)

 

110σ 224 x 168

 

 

5.5 m

 

 

3.3 m

 

 

 

 

151 cm

 

 

17 cm

 

 

 

101σ 224 x 126

 

 

 

 

(18.0χ)

 

 

 

 

χ

 

 

 

 

 

(5.0χ)

 

 

(0.56χ)

 

 

 

 

 

 

 

 

 

 

(10.8 )

 

 

 

 

 

 

 

 

 

 

 

 

120σ 244 x 183

 

6.0 m

 

 

3.6 m

 

 

 

 

165 cm

 

 

18 cm

 

 

 

110σ 244 x 137

 

 

(19.7χ)

 

 

 

 

χ

 

 

 

 

 

(5.4χ)

 

 

(0.59χ)

 

 

 

 

 

(11.8 )

 

 

 

 

 

 

 

 

 

130σ 264 x 198

 

6.5 m

 

 

3.9 m

 

 

 

 

178 cm

 

 

20 cm

 

 

 

119σ 264 x 149

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

(5.8

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(21.3 )

 

 

(12.8 )

 

 

 

 

 

 

 

(0.66 )

 

 

 

 

 

 

140σ 284 x 213

 

7.0 m

 

 

4.2 m

 

 

 

 

192 cm

 

 

21 cm

 

 

 

128σ 284 x 160

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

(6.3

χ

)

 

 

 

 

χ

 

 

 

(23.0 )

 

(13.8 )

 

 

 

 

 

(0.69 )

 

 

 

 

 

 

150σ 305 x 229

 

7.5 m

 

 

4.5 m

 

 

 

 

206 cm

 

 

23 cm

 

 

 

138σ 305 x 171

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

(6.8

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(24.6 )

 

 

(14.8 )

 

 

 

 

 

 

 

(0.75 )

 

 

 

 

 

 

160σ 325 x 244

 

8.0 m

 

 

4.8 m

 

 

 

 

219 cm

 

 

24 cm

 

 

 

147σ 325 x 183

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

(7.2

χ

)

 

 

 

 

χ

 

 

 

(26.2 )

 

(15.7 )

 

 

 

 

 

(0.79 )

 

 

 

 

 

 

170σ 345 x 259

 

8.5 m

 

 

5.1 m

 

 

 

 

233 cm

 

 

26 cm

 

 

 

156σ 345 x 194

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

(7.6

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(27.9 )

 

 

(16.7 )

 

 

 

 

 

 

 

(0.85 )

 

 

 

 

 

 

176σ 358 x 268

 

8.8 m

 

 

5.3 m

 

 

 

 

241 cm

 

 

27 cm

 

 

 

162σ 358 x 201

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

(7.9

χ

)

 

 

 

 

χ

 

 

 

(28.9 )

 

(17.4 )

 

 

 

 

 

(0.86 )

 

 

 

 

 

 

180σ 366 x 274

 

 

9.0 m

 

 

5.4 m

 

 

 

 

247 cm

 

 

27 cm

 

 

 

165σ 366 x 206

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

(8.1

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(29.5 )

 

 

(17.7 )

 

 

 

 

 

 

 

(0.86 )

 

 

 

 

 

 

182σ 370 x 277

 

9.1 m

 

 

5.5 m

 

 

 

 

250 cm

 

 

28 cm

 

 

 

167σ 370 x 208

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

(8.2

χ

)

 

(0.9

χ

)

 

 

 

 

 

 

(29.9 )

 

(18.0 )

 

 

 

 

 

 

 

 

 

 

 

 

190σ 386 x 290

 

 

 

 

 

 

5.7 m

 

 

 

 

261 cm

 

 

29 cm

 

 

 

174σ 386 x 217

 

 

 

 

 

 

 

 

 

 

χ

 

 

 

 

 

(8.6

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

(18.7 )

 

 

 

 

 

 

 

(0.95 )

 

 

 

 

 

 

200σ 406 x 305

-

 

 

 

 

6.0 m

 

 

 

 

274 cm

 

 

30 cm

 

 

 

184σ 406 x 229

 

 

 

 

 

 

 

χ

 

 

 

 

(9.0

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(19.7 )

 

 

 

 

 

(0.98 )

 

 

 

 

 

 

210σ 427 x 320

 

 

 

 

 

 

6.3 m

 

 

 

 

288 cm

 

 

32 cm

 

 

 

193σ 427 x 240

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

χ

 

 

 

 

 

(9.4

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

(20.7 )

 

 

 

 

 

 

 

(1.05 )

 

 

 

 

 

 

220σ 447 x 335

-

 

 

 

 

6.6 m

 

 

 

 

302 cm

 

 

34 cm

 

 

 

202σ 447 x 251

 

 

 

 

 

 

 

χ

 

 

 

 

(9.9

χ

)

 

 

 

 

χ

 

 

 

 

 

 

 

 

(21.7 )

 

 

 

 

 

(1.12 )

 

 

 

 

 

 

230σ 467 x 351

 

 

 

 

 

 

 

7.0 m

 

 

 

 

315 cm

 

 

35 cm

 

 

 

211σ 467 x 263

 

 

 

 

 

 

 

 

 

(23.0

χ

)

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(10.3 )

 

 

(1.15 )

 

 

 

 

 

 

240σ 488 x 366

-

 

 

 

 

7.3 m

 

 

 

 

329 cm

 

 

37 cm

 

 

 

220σ 488 x 274

 

 

 

 

(24.0

χ

)

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

(10.8 )

 

(1.21 )

 

 

 

 

 

 

250σ 508 x 381

 

 

 

 

 

 

7.6 m

 

 

 

 

343 cm

 

 

38 cm

 

 

 

233σ 508 x 286

 

 

 

 

 

 

 

 

 

 

χ

 

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

(24.9 )

 

 

 

 

(11.3 )

 

 

(1.25 )

 

 

 

 

 

 

260σ 528 x 396

-

 

 

 

 

7.9 m

 

 

 

 

357 cm

 

 

40 cm

 

 

 

239σ 528 x 297

 

 

 

 

 

(25.9χ)

 

(11.7χ)

 

 

(1.31χ)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

270σ 549 x 411

 

 

 

 

 

 

8.2 m

 

 

 

 

370 cm

 

 

41 cm

 

 

 

248σ 549 x 309

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

χ

 

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

(26.9 )

 

 

 

 

(12.1 )

 

 

(1.35 )

 

 

 

 

 

 

280σ 569 x 427

-

 

 

 

 

8.5 m

 

 

 

 

384 cm

 

 

43 cm

 

 

 

257σ 569 x 320

 

 

 

 

 

 

 

χ

 

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

(27.9 )

 

 

 

(12.6 )

 

(1.41 )

 

 

 

 

 

 

290σ 589 x 442

 

 

 

 

 

 

8.8 m

 

 

 

 

398 cm

 

 

44 cm

 

 

 

266σ 589 x 331

 

 

 

 

 

 

 

 

 

 

χ

 

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

 

 

 

 

 

(28.9 )

 

 

 

 

(13.1 )

 

 

(1.44 )

 

 

 

 

 

 

300σ 610 x 457

-

 

 

 

 

9.1 m

 

 

 

 

411 cm

 

 

46 cm

 

 

 

276σ 610 x 343

 

 

 

 

 

 

 

χ

 

 

 

 

 

 

 

χ

 

 

 

 

χ

 

 

 

 

 

 

 

 

(29.9 )

 

 

 

(13.5 )

 

(1.51 )

 

 

 

 

 

APPENDIX

85

Page 85
Image 85
Canon SX20 manual Relationship between Screen Size and Projection Distance, 50 σ 102 x 69 cm 46 σ 102 x

SX20 specifications

The Canon SX20 IS is a powerful and versatile digital camera that appeals to both amateur and advanced photographers. Launched in 2009, this camera brought together a range of impressive features that made it a popular choice among consumers seeking quality and convenience in a compact body.

One of the standout features of the Canon SX20 is its 20x optical zoom lens, which spans an impressive focal length equivalent to 28-560mm in 35mm terms. This versatility allows users to capture stunning wide-angle landscapes as well as detailed close-ups of distant subjects. The lens is accompanied by Canon's Optical Image Stabilization technology, which greatly reduces the effects of camera shake, ensuring that images remain sharp and clear even in challenging conditions.

At its heart, the SX20 IS boasts a 12.1-megapixel CCD sensor that delivers high-resolution images with vivid colors and fine details. This sensor works in tandem with Canon's DIGIC 4 image processor, which significantly enhances image quality, reduces noise levels, and improves overall performance. The combination of these technologies enables photographers to shoot in a variety of lighting conditions, from bright sunlight to low-light environments.

In addition to capturing still images, the Canon SX20 IS also excels in video recording. It features the ability to shoot 720p HD video, allowing users to document events with clarity and detail. The camera includes an HDMI output, which makes it easy to connect to HD televisions for instant viewing.

The camera's 2.5-inch vari-angle LCD screen is another noteworthy characteristic. This swivel display allows for creative shooting angles and improved visibility in bright sunlight. Coupled with a comfortable grip and well-placed control buttons, the SX20 IS provides an enjoyable shooting experience.

The Canon SX20 IS also includes a range of advanced shooting modes, such as the Smart Auto mode, which intelligently selects the appropriate settings for various scenes. Other manual controls, such as aperture and shutter priority, are available for those who want more creative control over their photography.

Overall, the Canon SX20 IS stands out with its unique combination of powerful zoom capability, excellent image quality, and user-friendly features, making it an appealing choice for anyone looking to enhance their photography experience without the complexity of interchangeable lenses.