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Keith over at Northlight Images has completed his extensive review of the Irix Firefly 15mm f/2.4 lens. We seem to have an abundance of fast ultrawide lenses to choose from now. Canon, Sigma, Rokinon, Zeiss and now IRIX all offer competent lenses at different price points.</p>
<p>The Firefly version of this lens has a lower build quality than the Irix Blackstone 15mm f/2.4, which Keith touches on.</p>
<p><strong>From Northlight</strong></p>
<blockquote><p>Optical performance is crisp and with good detail once you stop down a bit. My rough and ready testing suggests that on my 5Ds, f/6.3 or 7.1 give the best overall performance. That said if it’s a central subject the f/2.4 setting restricts DOF enough to soften the background for closer subjects. The amount of coma at the widest aperture may be an annoyance for astro photography, but it’s on a par with many other wide lenses I’ve looked at.</p>
<p>If you’re not used to it, then manual focus definitely will take some getting used to, but after a while you rarely need to give it too much thought. Modern DSLR viewfinder focus screens are pretty poor for manual focus, so even with a focus confirm indication, your distance estimating skills will improve too. <a href="http://www.northlight-images.co.uk/irix-15mm-lens-review/">Read the full review</a></p></blockquote>
<p><strong><a href="https://www.bhphotovideo.com/c/search?Ntt=irix%2015&N=0&InitialSearch=yes&sts=ma&Top+Nav-Search=&BI=2466&KBID=3296&KWID=EZ">Irix lenses are available at B&H Photo</a></strong></p>
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