Did Sigma ever say the 18-50mm is intended for vlogging cameras? I don't think so. Just because not having IS is considered good for a small niche doesn't mean it's a great thing they left it out.IBIS is really not preferable for vlogging cameras.
It is not really necessary at wide angles and causes more harm than good.
The lens is mainly a kit lens replacement. And AFAIK most, if not all, kit lenses have IS because most entry level cameras don't have IBIS. I think every photographer would agree leaving out IS is a big disadvantage of this lens.
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