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

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

1995 First Consumer Digital Camera Casio QV-10 250k pixels 2Mb flash memory

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

Canon EOS 5DS 50 Megapixels Price £3000

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

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

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

Noise at High ISO Setting

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

Depth of Field F 4 1/500th long lens

Depth of Field F 16 1/30th wide lens

Exposure Triangle

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 28 -200 24-75 26-80 29-88 24 -120 Aperture F 2.2 F 2.0-8.0 F 1.7-2.8 F 3.5-5.6 F 4 Weight Gms 130 192 393 344 + lens 560 840 Price £540 £200 £400 £450 £530 £2000

Which Camera

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

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

Digital Camera Sales

Digital Camera Sales