The Camera Site

Tele/Wide Converters , Adapters, Extension rings/tubes, reversing rings

The principal idea of the so called system camera is that it could be adapted to numerous jobs with a range of interchangeable components and specialized accessories. Today, even the most moderately advanced 35-mm system camera can take interchangeable lenses, data backs, close-up and photo micrographic attachments, winders, etc.
Perhaps the most popular accessories for the amateur photographers are various converters, adapters and extension tubes. The main advantage of a converter compared to extension ring or tube is that the minimum focusing distance remains the same when a converter is used and unlike with an extension tube you can stil focus to the infinity. Thus, if you have a 100mm lens that focuses down to one meter, it becomes a 200mm lens that focuses down to same distance when attached to a 2X tele - converter. Because of this, you can get better close-up images by using it. Tele-converter is more expensive than tube because it has optics but it is also more versatile.The main drawback of tele-converters and extension tubes is that they cause a loss of lens speed and they also have more or less negative affect to the overall lens performance. Thus, the development of more and more better and effective zoom lenses might abate the demand of this kind of equipment.

Tamron 2x Tele-converter for Minolta MD-mount. (right)
Most major-brand tele-converters produce good results. There is a slight loss of image quality, but not a lot. Some manufacturers offer matched tele-converters, made specifically for use with a particular lens (or a specific focal-length range). These can produce even better photographic results than general-purpose converters.
Nikon TC-14A, 1,4x Tele-converter (left)

Vivitar 2x Macro Focusing Teleconverter (left)
A splendid idea which is also working, being a teleconverter it is a extension tube too. With a matched lens it produces acceptable results.

Minolta P-Adapter (right)
This adapter converts Minolta MD-mount suitable for Pentax thread lenses.

Gold Line Wide-Converter

 

©2004 Reijo Lauro