Diffusion filter on telephoto lens

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h00sha New Member • Posts: 1
Diffusion filter on telephoto lens

The moment website says that longer focal lengths need more diffusion for the same effect, but elsewhere I’ve read that using a ¼ Promist on a 180mm lens will result in more diffusion than it would with a 24mm lens. Which is correct?

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Fujifilm X-A5 Fujifilm XF 27mm F2.8
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