Quote:
Originally Posted by Chukie  This might seem like a silly question to some but here go's how do teleconverter's work do they just alter the focal lengh of a lens ie if I used a 100mm lens it becomes a 200mm or isn't it that simple the reason I ask is like most I am on a tight budget so spending hundereds of pound's or even thousands on a new len's is not an option if I want to keep my manhood that is.But I would like to do more photo's of British wildlife and the only len's I have is a Canon 55-250 so stuggle at time's to get close enough
Thank's for any help in advance |
You're correct that they alter the focal length, but as you say it isn't that simple.
They also soak up a lot of light. Taking a 100mm f4 lens as an example, with a 1.4x converter the lens becomes in effect a 140mm f5.6 lens and with a 2x converter, a 200mm f8 lens. This in turn means you'll have to either shoot at slower shutter speeds or increase your iso to compensate.
The other downside is that even the best converters on the market will soften the image to some extent. The loss of quality will (usually) be greater with a zoom lens than a prime.
They're certainly a valid option if you need more magnification and can't afford a longer lens, as long as you're prepared for the downsides.
Cheers,
Rog