| Do you ever feel indecisive when selecting a lens | | | | sport. You just need one zoom lens to zoom in |
| for your DSLR? I know it is very annoyance, | | | | and zoom out. If you prefer prime lens, may be |
| because cost of lens is one of the consideration. | | | | you need three. |
| So, before choosing a lens, ask yourself what you | | | | Price: Do you think total cost for three prime |
| need, what is the object you want to captured | | | | lenses will cheaper than one zoom lens? |
| using the lens? So, below is the three main factor | | | | Portability: Do you think carry three prime lenses |
| that need to be considered before you buy your | | | | will easier than one zoom lens? |
| lens to suit your DSLR camera. | | | | Maximum Aperture |
| 1.Focal Length | | | | Now what is the reason we have to decide the |
| 2.Prime or Zoom | | | | maximum aperture for a lens? Because the lenses |
| 3.Maximum Aperture | | | | have the wider maximum aperture normally are |
| Focal Length | | | | costly. Wider aperture allow more light in, |
| Distance of the objects is the impact to decide | | | | narrower aperture allow less light in. If you taking |
| the focal length. Nearer object using shorter focal | | | | indoor picture, the light condition indoor is not as |
| length, and further object using longer focal length. | | | | good as outdoor, so you need wider aperture to |
| So, how to decide the number of focal length? | | | | let more light in, if not, the picture you taken will |
| Here is some example.below 35mm: Landscapes | | | | look dark. |
| and Interiors | | | | Another reason is to suit shutter speed. We need |
| 35mm to 70mm: Portraits | | | | faster shutter speed to take picture for fast |
| 70mm to 300mm: Portraits and Sports | | | | object. When your shutter speed is set to very |
| 300mm and higher: Wildlife and Sports | | | | short period, example 1/2000 second (just 0.005 |
| Prime or Zoom | | | | second), and you do not set your aperture wider, |
| Prime lens is the lens that cannot zoom in or | | | | then the picture you taken will become |
| zoom out, but Zoom lens can do so. Zoom | | | | underexposure, it look dark. |
| actually is controlling the focal length. Probably | | | | Last, is about the depth of field, the blurry |
| people will ask, why still have to choose for prime | | | | background is caused by this impact. Wider |
| lens if I got better choice that can be zoom as I | | | | aperture is decrease the depth of field, |
| like? Here is some simple comparison. | | | | background blurry; narrower aperture is increase |
| Cost: For same specification, prime lens is cheaper | | | | the depth of field, background clearly. |
| than zoom lens. | | | | As conclusion of this topic, it is all about the |
| Quality: Most people are agree this, the picture | | | | monetary problem. If I do not consider about my |
| taken by prime lens is better than zoom lens. | | | | economy status, I will choose focal length with |
| Weight: Prime lens is lighter, zoom lens is heavier. | | | | 18mm - 300mm, zoom lens, maximum aperture |
| Speed: In term of aperture, prime lens is faster | | | | by 1. But reality is cruel, I have to be more |
| than zoom lens. | | | | intellect, so I choose focal length 50mm, prime |
| Flexibility: If you want to capture photo for all | | | | lens, with maximum aperture by 3.5. |
| focal length such as landscape, interior, portrait, | | | | |