Travel Advice - Digital cameras

Digital cameras are revolutionizing way people take, manipulate, and display photographic images. Although digital cameras are relatively expensive, they offer great flexibility during both photography and subsequent use of the images.

One great feature of digital cameras is that they are equipped with a small screen that can be used to preview the picture you plan to take or review a picture that you have taken. Once you have snapped a picture, you can decide whether it’s worth keeping or delete it and snap another.

Another advantage of digital cameras is that you can easily share your images with friends via email since the pictures are already in digital form. Digital cameras come with software that makes it easy to transfer images from your camera to your computer

Most people now view their digital pictures in slide show viewers on their PCs and use their home color printer  to "print" quality images on photographic quality stock. Alternatively, many photo services on the Internet will print your digital images on quality photo paper, allow you to store images at their site and make them available to your friends for print ordering or viewing. Now that’s flexibility!

One shortcoming of some digital cameras is that they  are slow to focus and somewhat difficult to use for catching “action pictures”. Conversely, new digital cameras have a short start-up action, as well as the ability to capture video for action sequences. Video however, uses the storage capacity of the memory card very quickly.

Basics

Fully featured digital cameras capable of taking large, high-resolution, pictures are relatively expensive. The most significant differentiators of digital cameras are lens quality and memory size of the imaging chip contained in the camera. Memory size is directly related to image size and resolution. In general, more pixels allow you to take pictures at higher resolution. Whether you will benefit from higher resolution pictures depends on how you want to display the images.

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Image Size

Most cameras have settings that allow you to create images of varying size and quality. Image size is directly related to the number of pixels contained in the camera’s imaging device (not in the memory card). Camera standards continue to evolve and most technology writers recommend that any new camera purchased should have a 6 megapixel capability.

In general, the largest photograph that you can create using a digital camera can be calculated by dividing the pixels in each image dimension by the resolution of your intended output.

For example, printing photo quality images requires an image with a resolution of 300 pixels per inch.  In turn, a 6 megapixel camera has a resolution of 3008x2000, which would produce a high quality printed copy  at approximately at 10" by 7" size (at 300ppi). 

Many owners of digital cameras display their pictures on computer screens and televisions where image quality is less demanding.  Depending on the output devices, images produced at as low as 80 pixels per inch will look OK.  The best approach to deciding the image size issue is to take your photos at a size that meets your most common need.

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Image storage

Pictures taken with digital cameras are stored on a removable memory card that is housed inside the digital camera.

• Currently, several types of cards, (Secure Digital Cards, Compact Flash and SmartMedia) are commonly used by camera manufacturers but are not interchangeable.
  • You must use the type of card (e.g. Compact Flash or SmartMedia) that is supplied with your camera.
• Memory cards are available in increasingly larger memory sizes (from 16MB to 8GB). Larger memory size allows you to store more pictures before you will need to download them to your computer for processing. Unlike film, memory cards are designed to be reused over and over, as they contain only magnetic memory that can be written on (to store pictures) and erased (after you have copied the picture to your computer) thousands of times.

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Memory card management

Memory cards are relatively inexpensive (particularly since they can be reused over and over). When taking a trip, be sure to take enough memory cards to capture the number of pictures that you think you might take. We suggest taking several 1GB cards to record the images on your trip.  If you plan to use higher resolutions, increase the number and storage capability of the cards you take.

Most digital cameras feature an option that allows you to create and name folders on the memory card. In essence, you can create  new folders and label them descriptively for each new destination.

Unlike film-based photography with multiple rolls of film, all of your images from digital photography will be loaded on a small number of memory cards.

• For this reason, we urge you to keep the small plastic holder that contained the memory card (usually a clear plastic case the size of the memory card) when you purchased it.
• Take a small piece of tape that will fit on one side of the card case and write your name, address, and phone number on it before fastening it to the card case.
  • If you should happen to lose the case, there is at least a chance that someone will return it since they know how to contact you.
• When you have filled a memory card with images, store it in this case until you are able to download it.

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Before you go

Be sure to use your camera before you leave on your vacation to make sure that you understand how to use its features to your advantage.

• This is probably a good time to tell you that it is difficult to take a good picture while viewing a scene through the preview screen on a digital camera.
  • The reason for this is that it is likely that your hands will shake and “fuzz” the picture.
•  For stable images, use the normal viewfinder, if your camera has one, to compose the image, snug the camera to your head as you compose the picture, and firmly depress and release the shutter for a great picture.  Others suggest holding your breath while you snap the photo.
• Some newer cameras have image stabilization capability, which helps avoid blurry images. Image stabilization is defined differently by different manufacturers and we suggest that you examine the claims before buying.

Digital cameras run on electrical power supplied by a rechargeable battery. Most camera manufacturers provide the battery and charger as part of the camera package. Do yourself a favor and buy a second battery for the camera. When we vacation, we charge up both batteries before we leave on our next day’s outing. We often burn though the charge in one battery and need the second to get through the day.

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