Do I still need to step-down my aperture by 1-2 stops while using a TC?

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Jamerrone New Member • Posts: 11
Do I still need to step-down my aperture by 1-2 stops while using a TC?

The title says it all. I am wondering if I still need to step a few f stops down to get the sharpest images. For example, I am using a 100-400mm with a 1.4x converter. At 400mm my widest aperture is f5.6, so while using a TC it turns to f8. Normally, f8 is my sharpest aperture. Is this still the case with a TC? Or do I need to go to f11?

 Jamerrone's gear list:Jamerrone's gear list
Fujifilm X-T100 Fujifilm XF 100-400mm F4.5-5.6 OIS WR Fujifilm XF 16-80mm F4
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