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Jan 17, 2018 at 12:36 comment added flolilo @StephenG Huh? From my first sentence: Sigma 150-600mm f5-6.3 Contemporary DG OS HSM I see no mentioning of anything else in this whole question. If you refer to why Sigma doesn't claim it to be f/4.5-5.6, then your comment is just my side-note, inverted.
Jan 17, 2018 at 12:27 comment added StephenG - Help Ukraine If someone advertises a lens as a Sigma 150-600 f4.5-5.6 It will not correspond with any correct model specification and people will think he's either no idea what he's selling or could be trying to be fraudulent. Better to state the actual specification, not anything else.
Jan 17, 2018 at 12:23 history edited flolilo CC BY-SA 3.0
corrected grammar, added PDAF vs CDAF
Jan 17, 2018 at 11:10 history edited flolilo CC BY-SA 3.0
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Jan 17, 2018 at 10:07 history edited flolilo CC BY-SA 3.0
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Jan 17, 2018 at 9:59 history answered flolilo CC BY-SA 3.0