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Digital Cameras and their related parts

Megapixels, Zooms and common points explained

The Digital Camera market has expanded vastly in recent years with cameras available with impressive features for less than £100. There are many makes and models available which can confuse people the main things to think about are listed below.

View the latest digital cameras and prices [here]

Canon Ixus 40Sony Cyber-shot DSC-P200
Kodak EasyShare DX7440Pentax Optio S5i

How many Megapixels do you need?

As a general rule the more Megapixels the camera's sensor has, the more detailed image can be produced. For general everyday use including holiday pictures a camera with 4-6 Megapixels would be the minimum. This will produce good quality printouts of 4 x 6", even an older mobile phone with lower sensor can still produce decent sharp pictures for smaller sizes. For anything larger you should aim for a camera with 6-10+ Megapixels for larger prints. At

You shouldn't need to worry too much about pixel ratings as cameras have become more advanced and the lowest camera on retail now typically exceeds a resolution in excess of 10 Megapixels!!


Digital Cameras have two types of Zoom available the first is Optical Zoom which has a lens which physically moves and to view the image. These now feature on most cameras and began with 3x or higher, now the standard is around 12-45x as standard which gives you a huge amount of magnification of your subject.

The second type is digital zoom which uses the software within the camera unit to zoom, in essence it crops to the centre of the picture. As a recommendation we would suggest considering a camera with an Optical Zoom as this provides greater magnification whilst retaining image quality.

Common Features

Digital cameras always feature pre-set picture modes for standard, portraits, and night shots. 'Macro' mode is used for close-up photography, usually this is selected by choosing the flower symbol opposed to the mountain symbol somewhere on the unit.
Movie modes are included and many mid to higher end camera can shoot full HD Video, they normally connect via USB to HDMI so you can playback easier than ever. Look for the ,odes with the higher frames per second (fps) and stability controls as this will result in better image quality.

Digital Camera Memory Storage

The Memory Storage

xD Flash MemorySecure Digital Flash MemoryCompact Flash Memory

The higher the Megapixels, the larger size the image to be stored will be. Most cameras give you the option to adjust the level of image to reduce space required. With My 3.1 M.Pixel camera on a high setting, results in images of approx 1.2MB in size.

Your images need to be stored somewhere before playback and editing and with cameras that means on the memory card. Some cameras also include a small amount of memory built-in.If you work using the table below you can work out what size of card to use again we would recommend 1-2GB for the occasional user, and 4-8GB+ as a minimum for the heavier user.

Card 2GB 4GB 8GB 16GB 32GB
6 Megapixel 476 1905 3810 7620 15240
10 Megapixel 200 401 802 1604 3208
12 Megapixel 339 677 1354 2708 5416
HD 720p 10 Mbps 22 45 90 180 360
Full HD 1080p 9 Mbps 30 60 120 240 480
Approximate images per card and minutes for video

For Information on the different memory types click [here]

Battery life

The first thing people new to Digital Cameras notice is how quick they go through a set of batteries. Some cameras use dedicated battery packs some still use AA batteries for those users I would always recommend a branded set of high rated NiMH (nickel-metal hydride) rechargeable batteries. These can cost £10-£20 but provide a good length of usability and can often be re-charged within two hours.

Battery life has improved since the early days, lowering the screen brightness, and use of display will all help to improve the life, most cameras can handle 200 of photos easily less with video and heavy use.