Zoomlens met constant diafragma voor filmen

Tuesday 27 February 2024, 16:32 by Nando Harmsen | 2,625 views | 0 comments

This article was translated from Dutch with the help of AI. Read the original.

Soms is het leuk om tijdens het filmen in te zoomen of uit te zoomen. Hiermee kun je leuke effecten bereiken. Gebruik je een objectief zonder constant diafragma, let dan goed op de belichting.

Inzoomen of uitzoomen tijdens het filmen moet je niet te vaak gebruiken. Doe je dat te vaak, dan geeft dat een onrustig beeld. Je kunt het af en toe gebruiken en dan is het een leuk effect. Combineer het eventueel met het gelijktijdig veranderen van de afstand tot je onderwerp.

The Panasonic 20-60mm offers a useful range for video. Watch the aperture, which changes from f/3.5 to f/5.6.
However, be careful when using a zoom lens without a constant aperture. In that case, it is important not to choose the widest aperture, because the exposure will change.

I assume that manual exposure is being used. This gives you the correct shutter speed and the desired aperture. If you have a zoom lens with a variable aperture, choose an aperture that remains constant while zooming.

Watch the aperture when using a lens for video. This lens has f/3.5 at 18mm and f/6.3 at 150mm. Choose f/6.3 when zooming from 18 to 150mm while filming, so the exposure does not change.
An example makes this clear. I will use Canon's RFS 18-150mm lens as an example. It has a variable aperture of f/3.5 at 18mm and f/6.3 at 150mm. If you choose 18mm with an aperture of f/3.5 and set the exposure accordingly, the exposure will change when you zoom in to 150mm. The image will become darker.

If you choose f/6.3 at 18mm, it will remain the same throughout the entire zoom range. This keeps the exposure constant. Of course, you can also choose an aperture smaller than f/6.3. For example, f/8.

If you zoom while filming, preferably use a zoom lens with a fixed aperture throughout the entire range.

An alternative is an automatic exposure setting. In that case, the exposure will be adjusted automatically when you zoom in. Choose shutter priority with auto ISO. That way, you can be sure that the shutter speed remains constant.

If you do not want to worry about the aperture changing while zooming, choose a lens with a constant aperture throughout the entire zoom range.

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