Photography Tutorials


Camera Sensor Sizes, by Mark Allen

I spoke with a new member this evening at the camera club who was somewhat confused about camera sensor sizes. They had been told to get a camera with as many Mega Pixels (MP) as possible. As a result they were considering getting a new compact with a 16MP sensor.

Size does matter, but not the Mega Pixels! Almost every new camera will offer more than 10MP, which is more than enough – but image quality is quite simply better the larger the physical size of the sensor. Mobile phones have really tiny sensors. It does’t matter if they offer 4 or 8MP, the sensor is really, really small. In good light they are more than capable of producing great images. But when the light is low they struggle.

A cheap (<£100) compact has a much larger sensor, compared to a mobile phone camera. As a result they will offer better image quality. Their design allows for punchy, sharp images. Some compacts, like the Sony NEX, have a APS-C size sensor – the same size as most DSLR’s. (And larger than the four thirds DSLR’s).

A DSLR has an even bigger sensor, compared to a compact, and the same rule applies. The bigger the physical size of the sensor the better. Almost all modern DSLR cameras have a APS-C size sensor. This is more than enough for almost all situations.

Some (more expensive) DSLR’s have what is often called a ‘full frame’ sensor – Canon 5D MK1 and MK2, Nikon D3, D700, etc. These cameras, in good light, produce (arguably) the same quality as a APS-C sensor. But in poor light they are much, much better.

So the bottom line is this: if you are interested in image quality, don’t go for the latest whizz bang 16MP compact with a small sensor. Instead go for a DSLR (or one of the compacts) with a APS-C size sensor.

To find out more about sensor sizes, please see:

http://en.wikipedia.org/wiki/Image_sensor_format

Spot Metering

Recently discussion centred upon Spot Metering.  Some of our less experienced members have not understood or tried this technique.

Try a visit to these sites for more information.

http://www.luminous-landscape.com/tutorials/zone_system.shtml

http://www.digital-photography-school.com/spot-metering%E2%80%A6-expose-yourself

http://www.inthephotozone.com/getting-good-exposure-with-spot-metering/

http://rcavanaugh.com/2011/01/photography-waterfalls-spot-metering-the-zone-system-and-exposure-lock/

http://laurencekim.com/2011/05/23/spot-metering-for-portrait-photography/

Understanding & Using Ansel Adam’s Zone System

http://photo.tutsplus.com/articles/theory/understanding-using-ansel-adams-zone-system/

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