Optical and digital zoom As conventional cameras, including digital cameras is very important focus. In this case we have products with “fixed focus“, this especially in cheaper models, and “Auto Focus,” which allows the best results since it allows the automatic movement of the lenses. In the event that you should photograph objects very close together, some products allow you to use functions “macro” focus, which allow to grasp the finer details of the image.
In digital cameras “non-professional” you can not replace the optics (the professional ones allow it, but can cost tens of millions), which forces her to an intensive use of the zoom. You will hear talk of “optical zoom” and its corresponding digital. Beware especially of the latter in that it is another “fiction” purely computer. Digital zoom works, in fact, isolating the area covered by the particular sensor to capture, and then interpolating the missing information processing with math.
With an optical zoom, entirely similar to that of the conventional cameras, there is no contrast, no degradation of image quality, as is the case in the first case, given that the magnification is realized in an optimal way, ie by physically moving the lenses. Instead, use a photo editing program if you need to change the type of image resolution. Camera Film, goodbye! The film is perhaps the most passed in relation to this generation of products. In fact, within a camera, images can be stored in removable memory modules. You no longer need to go to the photographer for development, but just “download” the contents of a Memory Card into the home PC or laptop in case we travel. In some cases, especially in cheaper models, the memory modules are not removable, but they are physically part of the camera body.
In this case, the transfer of data to the computer can only be done through serial or USB cable, with a transfer time of about 40/45 seconds for each photograph. One of the great advantages offered by the removable cards, is that it can also be read directly from the PC through the use of special adapters (sold separately) or, increasingly in the case of laptops, through the use of specific PCMCIA cards. Not to mention that, getting more memory cards, you can take a lot of photos, without being forced to free the memory of the camera every time it reaches its maximum capacity. Since the media “physical memory”, you can use indefinitely, clearing and filling them again, without in any way compromising the quality of the images stored in them. There are basically two types of SmartMedia and Compac tFlash.
The former are much cheaper, but available in denominations of a few Mb, while the second, much more expensive, can contain up to 192 Mb of images. But be careful to check the compatibility of your camera with memory modules too capacious, given that not all models support capacities greater than 64/128 Mb. In the table you find in these pages you can check out the indicative costs of these cards for each camera model tested in this trial. An alternative to this type of support cards are manufactured by Iomega Click diskettes that come with a special reader easily be connected to any type of computer (PC or Mac), however, offer a decent storage capacity, 40 MB, cost quite content .
Take aim To
take a picture you have to are two systems of pointing: the classic “Galilean viewfinder,” this even on machines traditional photographic, and LCD panel, to be used especially when shooting more difficult. It is not excluded, however, that some models will provide both possibility. We recommend, therefore, prefer this type of cameras to those that mount the display only liquid crystal, since the considerable consumption of energy LCD panel affects heavily on the duration Total battery.
The sensor of Digital Camera
The optical zoom is the distance that the camera lens can physically move away from the camera body (its focal length). The optical zoom lets you get closer to the subject without physically approaching. In addition, the optical zoom lets you get closer to the object of the frame without losing picture quality ‘and show the squares of pixels.
The digital zoom is beyond the Limete optical zoom, magnifying the pixels in the picture making it look bigger. It’s the same thing that happens when you crop a photo and enlarges, but it is done in-camera. The advantage of the digital zoom is that you can bring so much more into the scene than the optical zoom, but the result can be a photograph of inferior quality.