|Originally posted by Zoofythejinx:|
|Quoted Message: Alright don`t laugh but I can`t find a straight answer on this anywhere. I`m thinking of getting a new lens for my camera and I need to know if I get a 2.0x telephoto lens and my camera has 20x optical zoom. Will it double my optical zoom to 40x? Or will it just give me 2x more optical zoom?
Neither. If it's a 2x teleconverter it will double your focal length, not your zoom. So for instance, if you had a 50-500mm lens (a 10x super-zoom for a DSLR) it would change those focal lengths to 100-1000mm, which is still "10x zoom".
I looked up your camera model, and this is what it says your focal lengths are without the conversion lens:
28-560mm equiv.(4:3), or 31-620mm equiv. (16:9)
That's what makes the 20x zoom (28mm x 20 = 560mm, or 31mm x 20 = 620mm).
If you add a 2x teleconverter lens, your equivalent focal lengths will then become:
56mm - 1120mm (4:3) or 62mm - 1240mm (16:9)
This is still a 20x zoom, but at a much tighter crop.
As Afagundes says, you will also lose light... with a DSLR a 2x teleconverter will lose you two stops of light. Not sure if you'll lose exactly the same light, but what this means is that your camera will have to shoot at a much slower shutter speed to obtain the same exposure.
f/2.8-3.5 SWD | Zuiko 14-54mm f/2.8-3.5 | Vivitar 100mm f/2.8 Macro |...