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<blockquote data-quote="hark" data-source="post: 384419" data-attributes="member: 13196">I haven't used either one, but I'd bet the Tokina is a better lens.The Tokina has a constant aperture of f/2.8. That means you can use f/2.8 while the lens is set at 11mm, and you can use it at any point all the way up to 16mm. The Sigma is a variable aperture lens. You will be able to use the f/4 at 10mm, but when you start to zoom out, the widest aperture number will change. At 20mm the widest you should be able to go will be f/5.6. You shouldn't be able to zoom out to 20mm and use f/4. That's what happens with variable aperture lenses, and it's one of the reasons why they tend to be less expensive than a constant aperture lens.Will the extra 1mm make a big difference? I don't think it will impact the view too much. Will you miss the 20mm view? Perhaps a little. But it is a trade-off you need to consider before making your decision. If you go with the Tokina, you can always zoom with your feet...well, in most cases. <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="hark, post: 384419, member: 13196"] I haven't used either one, but I'd bet the Tokina is a better lens. The Tokina has a constant aperture of f/2.8. That means you can use f/2.8 while the lens is set at 11mm, and you can use it at any point all the way up to 16mm. The Sigma is a variable aperture lens. You will be able to use the f/4 at 10mm, but when you start to zoom out, the widest aperture number will change. At 20mm the widest you should be able to go will be f/5.6. You shouldn't be able to zoom out to 20mm and use f/4. That's what happens with variable aperture lenses, and it's one of the reasons why they tend to be less expensive than a constant aperture lens. Will the extra 1mm make a big difference? I don't think it will impact the view too much. Will you miss the 20mm view? Perhaps a little. But it is a trade-off you need to consider before making your decision. If you go with the Tokina, you can always zoom with your feet...well, in most cases. ;) [/QUOTE]

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