do you wanted to purchase a new lens for digital SLR camera you are having. I know it will be quite difficult to find out the one which is best suitable for you. when you are looking to buy a lenses then it is necessary that you should get value for your money. But if you are looking to get high-quality photography then you should consider following points apart from the price tag of the device.
Focal Length
‘you should aware of that what kind of photography you are supposed to do with new lens. Since some specific kind of focal length which would be suitable for specific kind of shooting situations. wide-angle lenses which are having range of 10mm and 20mm are suitable for landscape or architectural shots..
Long zooms lenses are suitable for wildlife photography. 50mm and 100mm lenses are considered as Portrait. 70mm-to-200mm zooms might fall into the same category as well. If you are looking to have one and all purpose lenses then I recommend that you should consider the range of the focal lengths for eg 18mm to 200mm.
Fixed Aperture vs. Variable Aperture
As far as I know camera lenses are having both fixed aperture or variable aperture. Well Fixed apertures allows enter of maximum amount of light into your camera at any given focal length. It simply gives you great amount of versatility. However those lenses are available at with very high price tag.
Variable-aperture lenses are having range of maximum aperture of f3.5 to f.5.6. you can have good lenses in Variable-aperture. Those lenses are not having same optical quality as that of the fixed-aperture equivalent. Even you cannot use Variable-aperture lenses to shoot the photos in to low light situation.
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