There are many types and kinds of DSLR camera lens. Besides different kinds or types, for any price difference is very striking, ranging from less than one million to hundreds of millions of dollars. This can be confusing to those who plan to buy a DSLR camera or add to the collection lens. When the last article we’ve sajika I rate the quality of digital SLR lens, we now present a guide in choosing a DSLR lens. Happy reading .
Guidelines that we set up this time is general and simple, unlike the previous guide devoted to Canon and Nikon lenses only. In this article we classify digital DSLR lens in the various main groups, namely on the basis of its diameter, based on the type and based on the aperture diaphragm.
Lens Diameter.First, based on the diameter of the lens, now there are two general classes, namely:
* Full-Frame Lens (35mm)
* Crop Sensor Lens
For full-frame lens, optical diameter larger than the crop sensor lenses. This is because the full-frame lenses are designed to be used in full-frame digital SLR and 35mm film SLR. In the market, we need to recognize the code that shows the full-frame lens, such as EF for Canon, Nikon FX for, DG for Sigma and so on.
While crop sensor lenses are smaller, designed for DSLR with a sensor smaller than full-frame sensor, which is APS-C sensors (Canon, Nikon, Pentax, Sony) and sensor Four Thirds (Olympus). This lens has a diameter smaller than fll-frame lens, but still has the same mounting design. That is, we could have put this lens on crop sensor DSLR full frame, but on the picture will have a circle on the outside of the image (vignetting) due to sensor size is larger than the diameter of the lens. Crop sensor lens is identified by code such as EF-S for Canon, Nikon DX to DC for Sigma, DA for Pentax and so on.
Photograph will show the size difference between APS-C sensors and sensor full-frame 35mm. Red circle shows the diameter of the full-frame lens and a green circle shows the diameter of the lens crop. It appears that the diameter of the lens crop has been designed to adjust the size of APS-C sensor which is smaller than 35mm sensors. Sometimes the APS-C camera owners actually use full frame lenses. This is due to the professional needs of most lenses available are full-frame lens. For example, to professional needs, the user selects the camera EOS 7D EF 70-200mm lens.
Type of lens focal
Judging from the type of lens, there are two main groups of primes (prime) and zoom lens. Very simple, fixed lens means has only one focal length value, while the zoom lens can be changed from shortest to longest focal. Zoom lens itself is divided over several focal range, such as wide zoom, normal zoom and tele zoom. There is also a broom lens universe, aka can play from wide to telephoto zoom practical for travel. This time we describe the advantages and disadvantages of each option are:
Prime lens / fix
Pentax 70mm f/1.4
Prime lens is a lens that only has one focal value, eg 35mm, 50mm, 100mm and so on. The lens of this type generally have a large maximum aperture, eg f/1.4 or f/1.8, so suitable for use during low light. Although there are various choices of lens focal fix on the market, but the most popular is because it has a 50mm lens focal with normal perspective.
The attraction of the Fix Lens include:
* Relatively cheap
* Small size and lightweight
* The images are very sharp
* Because it has a large opening, can produce a thin DOF
* Because it has a large opening, can be relied upon to low light
The thing that is less pleasant than this prime lens is the lens can not change focal focal position so as to change we must go forward or backward toward the object.
Wide zoom lens
Sony SAL DT 11-18mm f/4.5-5.6
Wide zoom lens is a zoom lens has a focal range from 10mm wideangle to 30mm, making it suitable for landscapes and architecture, although less suitable for portraits because of the distortion.
The appeal of such a wide zoom lens:
* Able to produce images with a wide angle with the impression and dramatic
* Suitable for professional and commercial needs
However, wide zoom lens is sold at a relatively expensive because of the high level of difficulty in designing such lenses. In the market, such lenses are sold at a price range of $600 to $12 000 US dollars.
Examples of the wide zoom lens:
* Canon EF-S 10-22mm f/3.5-4.5
* Nikon AF-S 10-24mm f/3.5-4.5
* Pentax DA 12-24mm f / 4
* Sony SAL-DT 11-18mm f/4.5-5.6
* Olympus Zuiko 9-18mm f/4-5.6
* Recommendation for 3rd party: Tokina 11-16mm f/2.8
Zoom lens normal / standard (general purpose)
Zuiko 14-54mm f/2.8-3.5
Is a zoom lens has a focal range that is considered to meet the needs of ordinary wide to tele. Such lenses are able to accommodate the range of normal focal range of 50mm so as to produce a low image distortion, and produce the same perspective as what is seen by the human eye. Normal zoom lens will be more expensive if you have large openings, especially if have a constant f/2.8 aperture profesi0nal belonging to the class.
Examples of normal zoom lens expensive class :
* 24-70mm f/2.8 Lens
* 17-55mm f/2.8 Lens
While the normal zoom lens among economical :
* Canon EF-S 17-85mm f/4-5.6
* Nikon AF-S 16-85 f/3.5-5.6
* Pentax DA 17-70mm f / 4
* Sony SAL DT 18-70mm f/3.5-5.6
* Olympus Zuiko 14-54mm f/2.8-3.5
* 3rd party Recommendation: Sigma 17-70mm f/2.8-4
Telephoto zoom lens
Nikon AF-S 70-200mm f/2.8 VR
Telephoto zoom lens into the lens of one of many people’s favorite because of its ability to use photographs of objects that far, plus the price is quite affordable. Not to mention a telephoto lens capable of producing images with good bokeh (thin DOF), you could say almost equal to the results obtained with prime lenses.
But keep in mind that a telephoto zoom lens telephoto focal range of 100mm above, so vulnerable to vibration due to hand shake. For that professionals prefer large aperture telephoto lens stabilizer and added features, so a telephoto lens can still be used in low light conditions.
For such a professional telephoto zoom :
* Canon EF 70-200mm f/2.8
* Nikon AF-S 70-200mm f/2.8 (picture above)
* Pentax DA 60-250mm f / 4
* Sony SAL 70-200mm f/2.8
* Olympus Zuiko 90-250mm f/2.8
* Sigma 70-200mm f/2.8