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Lenses
Telephoto
Sigma 150-600??????
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<blockquote data-quote="J-see" data-source="post: 484770" data-attributes="member: 31330"><p>What I noticed with longer lenses is that they require constant fine-tuning especially when you shoot them wider.</p><p></p><p>Plastic, metal and glass all reacts differently to heat so it is no surprise when temperature drops or rises, it affects critical focus. I was getting slightly softer images with my 300mm and by re-tuning her to the heat these days and dialing her back 2 steps, I now have sharp shots again.</p><p></p><p>For shorter lenses it isn't always a problem since you often have more DoF but for a long lens and shots at higher magnification, having focus one or two stops in the wrong direction makes all the difference.</p></blockquote><p></p>
[QUOTE="J-see, post: 484770, member: 31330"] What I noticed with longer lenses is that they require constant fine-tuning especially when you shoot them wider. Plastic, metal and glass all reacts differently to heat so it is no surprise when temperature drops or rises, it affects critical focus. I was getting slightly softer images with my 300mm and by re-tuning her to the heat these days and dialing her back 2 steps, I now have sharp shots again. For shorter lenses it isn't always a problem since you often have more DoF but for a long lens and shots at higher magnification, having focus one or two stops in the wrong direction makes all the difference. [/QUOTE]
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Lenses
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Sigma 150-600??????
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