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Digital SLR Cameras Guides

Posted by [email protected] on May 5, 2016 at 1:10 AM

The SLR is the most advanced digital cameras , but also the most expensive. Seasoned professionals and amateurs are turning to this high-end equipment to satisfy their need for total control of photographic settings.

The SLR is a digital camera designed not just to take pictures, but to make the picture a hobby (or profession) as such. On this type of device, the manual settings (aperture, shutter speed, sensitivity, white balance, focus, etc.) play for much of the rendering quality. We must master to perfection to take full advantage of its device. Here is a small development to guide you if you decided to take the plunge. And thus join the world of photography enthusiasts.


The sensor, an essential component

As with any digital camera (compact, bridge, hybrid), the sensor resolution among the first criteria put forward by the manufacturers. This is however not the most decisive: the average for an SLR is now around 20 megapixels, which is already huge. Knowing that to obtain a quality image for printing, the pixel density is to achieve 300 dpi (dots per inch) minimum, and a sensor 6 Megapixels suffices to print an image of 18 × 24 cm. However, a higher resolution can be useful for bigger enlargements or to crop the image on his computer.


On an SLR, this expensive component manufacture is on average four times greater than on a CD, or on a bridge. The most common format is called APS-C, which is approximately 15 × 23 mm. Only high-end devices are equipped with larger sensors, the "historic" dimensions of 24 × 36 mm. There is talk of sensors "full frame" (FF) or "full size." It includes consideration of sensor format if child from film, you already have your goals (see box).


Budget: tick on optics

An interchangeable lens

As their ancestors silver, objectives are interchangeable on a DSLR. It's one of the advantages of these devices, but it is also where lies their main weakness: sensitivity to dust. When changing the lens, the sensor is exposed. The slightest collect dirt appears on the pictures! The handling must be carried out in a clean environment. Some models incorporate a function to clean the sensor when power is turned off.


It is commercially sold alone housings (count from 300 to over € 3,000) or with a basic objective of average quality (even among major manufacturers). Opt immediately for a better objective may be appropriate, even if it costs more. Much being aware, optics represent anyway a large budget for any DSLR user. To cover the same focal range as a bridge, for example, it will buy two or three goals at minimum! Supply is abundant. From the ultra-wide angle to telephoto, for photographing large areas or microscopic insects, we find on the market a range of fixed targets or offering varied focal ranges. Their prices range mostly between 100 and € 1,000! The choice will be primarily driven by the needs and requirements of the photographer.


Stabilization: housing or objective?

Canon telephoto

The other drawback of SLR is their weight. It is not uncommon that the housing assembly + objective exceeds the kilo. Unless you use a foot, difficult in these conditions to remain perfectly still during shooting. To compensate for movement by the photographer, and thus prevent the photos from blurring, manufacturers have integrated stabilization systems. Two schools of thought. Canon and Nikon have chosen to equip their goals, believing that each of them had to be stabilized differently depending on its intrinsic parameters (focal length, weight). Other brands (Olympus, Pentax, etc.) opted for a stabilization of the housing itself (its sensor, specifically) in order to save money (a stabilized lens costs on average 25% more expensive). At each to make his choice.


Other checkpoints

ISO mode

Sensitivity: It determines the relative aperture / shutter speed for a given illumination; it is measured in ISO. The user can choose between different values: 100, 200, 400, 800 and up to 1600 in most cases. Some devices allow you to go to even greater sensitivities (3200, ISO 6400 or even more!) For shooting in dark environments. But mistrust: the quality is rarely optimal, high sensitivities are highly generating "noise" that is to say of parasites that affect the rendering. In photography, there was talk of "grain" to describe this phenomenon.

Different extra flashes

Flash: A supplementary flash can also be useful (allow 50 to € 600 on average). Certainly, it is in addition to other accessories (and more so, optical and must carry bag, which is also a budget, between 20 and 300 € depending on size and quality). But it will replace the built-in flash, generally less efficient (power, uniformity).

Burst Mode: To take pictures of moving subjects at sporting events such as the file photograph multiple images automatically multiplies the chances of a successful shot. Burst mode allows usually take 2 to 4 fps keeping your finger on the trigger. Some devices offer more (up to 8 frames per second), but the resolution of each image is greatly diminished.


RAW: Photographers will appreciate the ability to save the images in RAW, a raw recording format that multiplies the possibilities of editing (white balance, exposure ...) before recording the picture in a format (.jpg, by example) to operate. This method provides more flexibility in changing shooting settings, look better, and the ability to save the selected settings (on the computer) to apply to multiple images (batch processing). The consideration: RAW files are very large, which requires the use of high capacity memory cards.


Power Type (or batteries): The SLR cameras are powered by Li-ion batteries. Their autonomy allows taking pictures at least 250. A second battery, take-charge, can be very convenient to not run out. Allow between 30 and 85 € (depending on the brand and model) for a battery.

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