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Message: <blockquote data-quote="J-see" data-source="post: 428959" data-attributes="member: 31330">I tuned my Tam at 400mm using a shorter distance than that and it worked fine.You can better tune your lens inside at 8 meters and remain in control of all factors involved than try to do it at such distances where you lack that control. It is critical you focus at a perfect angle at your target and that the cam is in level.It's important that whatever tuning method you use, you follow the required steps. You can make some changes to the procedure but you have to know what you are doing and why. If not, whatever the outcome of the tuning, I'd not dare to bet money on it being correct.</blockquote>