1. Alphington Photographic Club
Digital Photography
Which camera for you?
Alphington Photographic Club
25 Feb 2016

2. 1978 The Original Digital Camera
Invented
by Steve Sasson
100 x 100 pixels

3. 1995 First Consumer Digital Camera
Casio QV k pixels 2Mb flash memory

4. 1999 First Practical Digital SLR
Nikon D1 with 2.7 megapixel sensor - $6,000

5. Canon EOS 5DS 50 Megapixels
Price £3000

7. Basics Digital images are made up of pixels
1 million pixels equals 1 megapixel (Mp)
Digital Cameras specify the maximum number of Mp that they can record.
A typical 10inx8in photo requires 300 pixels per inch or 7.2Mp resolution
A HD laptop display resolution is 1920pixels x 1080pixels or about 2Mp
4K UHD TV has a resolution of 3840pixels × 2160pixels or about 8Mp

8. What you need for a Good Print
A digital image with 300 pixels per inch
For a 6in by 4in print this means an image
1800pixels x 1200pixels
For a 12in x 8in print this means an image 3600pixels by 2400pixels
A 3Mp camera can produce an image approx 2000 pixels by 1500pixels
A 12Mp camera can produce an image
approx 4000pixels by 3000pixels

9. Are all pixels equal - NO
If you have two cameras with the same pixel count the one with the larger sensor area will give a better quality image
Sensor type/size
Sensor size mm
Area sq. mm
Full frame
36x24
864
APS-C
22x15
330
Four Thirds
17x13
221
1/1.7in
7.6x5.7 43
1/3in
4.8x3.6 17

10. Noise at High ISO Setting

11. Depth of Field at f8 aperture
Sensor
Focal length
Focus m
Near Point m
Far point
DOF
APS-C
31mm
0.15
0.147
0.153
5.39mm
35mm
50mm
0.1486
0.1515
2.83mm 2
1.54
2.85
1.7m
1.69
2.45
1.0m 5 20
17.15m
50 mm
3.4
9.4
6.0m
at f4 DOF will halve
at f16 DOF will double
Larger sensor = smaller DOF
Smaller sensor = larger DOF

12. Depth of Field
F /500th long lens

13. Depth of Field
F /30th wide lens

14. Exposure Triangle

15. Camera Comparisons Camera IPhone 6 Lumix DMCLF1 EVF Lumix LX100
Sony A6000
Canon 750D
SLR
Nikon
D750
Megapixels 8 12
12.8 24
Sensor size
Sq mm
1/3in 17
1/1.7in 43
Four Thirds
225
APS-C
330
Full frame
864
Relative pixel size 1
1.8
8.7
6.8 18
Focal length
35mm eq 29
24-75
26-80
29-88
Aperture
F 2.2 F F F
F 4
Weight
Gms
130
192
393
344
+ lens
560
840
Price
£540
£200
£400
£450
£530
£2000

16. Which Camera

17. Advantages of CDC vs SLR
Smaller and lighter
Smaller sensor means larger depth of field and closer focusing distance
DOF is inversely proportional to sensor size
DOF is proportional to aperture
No mirror noise or vibration
EVF shows visual effect of camera settings
NFC and WIFI connectivity

18. Useful Web Resources Photographylife.com Dpreview.com
Digital-photography-school.com
Digitalcameraworld.com
Wikipedia section on lenses (optics)

19. Digital Camera Sales

20. Digital Camera Sales