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Modifying a Sigma 150-600mm Contemporary lens
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<blockquote data-quote="BF Hammer" data-source="post: 791324" data-attributes="member: 48483"><p>How do you attach your lens to tripod? Screw it in directly or use a quick-release? Have you ever tried to balance the lens on a gimbal head? Have you ever tried long exposure night photography on a star tracker?</p><p></p><p>Me personally, I find it impossible to securely screw an Arca-Swiss style quick release with the single screw hole provided on the lens foot. I have had the lens suddenly twist loose on it's own at least 2 times when shooting or transporting while attached to tripod. That was before I bought the i-Shoot replacement mounting foot which solved the twisting loose issue, but still left the lens front-heavy when extended to 600mm. That is a problem on a gimbal (it should be neutral in balance) and more problem on a star-tracker mount when you are unable to balance things out.</p></blockquote><p></p>
[QUOTE="BF Hammer, post: 791324, member: 48483"] How do you attach your lens to tripod? Screw it in directly or use a quick-release? Have you ever tried to balance the lens on a gimbal head? Have you ever tried long exposure night photography on a star tracker? Me personally, I find it impossible to securely screw an Arca-Swiss style quick release with the single screw hole provided on the lens foot. I have had the lens suddenly twist loose on it's own at least 2 times when shooting or transporting while attached to tripod. That was before I bought the i-Shoot replacement mounting foot which solved the twisting loose issue, but still left the lens front-heavy when extended to 600mm. That is a problem on a gimbal (it should be neutral in balance) and more problem on a star-tracker mount when you are unable to balance things out. [/QUOTE]
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Modifying a Sigma 150-600mm Contemporary lens
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