Is added adapter similar to extension tube?

Started 3 months ago | Questions thread
SimonOL Senior Member • Posts: 1,956
Re: Is added adapter similar to extension tube?

grsnovi wrote:

Paraphrasing Wikipedia , I understand that extension tubes:

Contain no optical elements...

and they move the lens farther away from the focal plane results in:
- closer focus,
- greater magnification,
- and greater loss of light.

Lens adapters may unintentionally have an effect similar to an extension tube.

An well-made adapter won't do that - it will be the right length for the camera & lens combination

That's assuming it is possible to adapt that lens to that particular camera. Generally, the lens needs to have a longer flange focal distance than the camera body; that difference provides enough physical space for the adapter to position the lens the correct distance from the sensor so that everything works normally.

Very occasionally -  particularly with the very cheapest, no brand adapters - you can get a poorly-made adapter that is just a bit longer than it should be. Then it would act like a very thin extension tube.

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