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<blockquote data-quote="J-see" data-source="post: 484407" data-attributes="member: 31330">I don't think the issue with fine-tuning different focal lengths is a matter of being fanatic but one of being unaware how much difference there can be. I used to tune my lens at one length and that was it. It's not that I had any other choice. It's only when I accidentally tuned my lens at 150mm (I forgot to change the focal length, old age and such) and directly repeated the process at 600mm, I noticed how much difference there is between both ends. From something like +6 to -6 if I remember well. It means if I tune her at 600mm, at 150mm she is now tuned 12 stops into the wrong direction, at 400mm about six. That's disastrous, forcing me to either mainly use one focal length and stick to that or note down the values and manually adjust them each time.About the donkey:I don't know if it is an English expression too but here it goes someone like &quot;A donkey never hits the same stone twice.&quot;Only an .... does. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" /></blockquote>

[QUOTE="J-see, post: 484407, member: 31330"] I don't think the issue with fine-tuning different focal lengths is a matter of being fanatic but one of being unaware how much difference there can be. I used to tune my lens at one length and that was it. It's not that I had any other choice. It's only when I accidentally tuned my lens at 150mm (I forgot to change the focal length, old age and such) and directly repeated the process at 600mm, I noticed how much difference there is between both ends. From something like +6 to -6 if I remember well. It means if I tune her at 600mm, at 150mm she is now tuned 12 stops into the wrong direction, at 400mm about six. That's disastrous, forcing me to either mainly use one focal length and stick to that or note down the values and manually adjust them each time. About the donkey: I don't know if it is an English expression too but here it goes someone like "A donkey never hits the same stone twice." Only an .... does. ;) [/QUOTE]

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