Vello AF EXTENSION TUBE SET User Manual - page 10
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User Manual
Manual is about: for mirrorless cameras
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• At extremely close distances, focus may be difficult to achieve, whether using
auto or manual-focus. If this is the case use a macro focusing rail or set the lens
manually to the desired focal point. Then, move the lens forward or backward
to achieve the sharpest focus.
• When using extension tubes, an on-camera flash may result in unsightly
shadows, so it is not recommended. For best results, use an off-camera flash,
dedicated macro light, or another light source.