Teleconverters

[Dano]

Can someone explain how a teleconverter is supposed to work?

I've added a 2x to my Canon G3 (4x zoom), and figured I would get 2 x 4 or 8x zoom. But that's not what it looks like.

Thanks,

Dano

[Dacol]

According to the specifications of your Canon G3 digicam its lens
have a range of effective SLR focal lenght from 35mm to 140mm hence the 4x zoom (140 = 4 X 35). Now the the 2x teleconverter doubles the focal lenght, thus with the teleconverter your camera now has a range of SLR effective FL from 70mm to 280mm but the zooming factor is still 4 (280 = 4 x 70 ). Usually when using a teleconverter the camera lens has to be set at maximum FL (the T setting) otherwise one has a vignetted image. In practice this means that the zooming capability is really not usable in this case since one can only use the lens at max zoom with the teleconverter.

Dalcio

[Dano]

I must have bought a set of cheap glass lenses in a tube. I'm not getting anywhere near 280 mm with the teleconverter.:sad:

Dano

[meow]

So what converter did you buy?

[Dacol]

How did you determine that?

Dalcio

[Dano]

meow wrote:

So what converter did you buy?

It's a GroBartig 2.5X, that I bought in Singapore. It looked fine in the store, but it doesn't seem to have much magnification.

Dano

[KCan]

Dano wrote:

, but it doesn't seem to have much magnification.

It's more objective if you take 2 pics and compare to conclude if it's a 2.5x or not

[andreas4photo]

I have the Bower 2.0x Digital Tele Lens and the magnification is exactly 1.32. I have no idea how this magnification corresponds to the 2.0x printed on the device.