![]() So while it may not quite match the capabilities of a 24-70mm F2.8 on a full frame SLR, for existing APS-C users it should offer something very close. The lens's 27-53mm equivalent focal length range is obviously a little limited, but should still be rather useful for such applications as wedding and events photography. It also incorporates several of the thoughtful design touches that we were impressed by on the 35mm F1.4, including an improved AF switch, and a large grip area on the base of the barrel for better handling. It's compatible with Sigma's new USB dock which allows you to fine-tune autofocus behaviour in much more detail than the AF microadjust corrections found on SLRs, which should help get the best possible focus accuracy and make the most of the large aperture. Essentially it means that APS-C shooters will be able to use lower ISOs when shooting wide open in low light and get similar levels of image noise, substantially negating one of the key advantages of switching to full frame.Īs we'd expect at this level, the lens uses an ultrasonic autofocus motor for fast, silent focusing. This is important as it's a major determinant of image quality. By this we mean that it will be able to project an image that's just over twice as bright onto a sensor that's slightly less than half the area, meaning the same total amount of light is used to capture the image. What's more, combined with an APS-C sensor, the system will also offer effectively the same light-gathering capability as an F2.8 lens on full frame. Sigma's choice of F1.8 as maximum aperture isn't a coincidence it means that the lens will offer the same control over depth of field as an F2.8 zoom does on full frame. This all bodes well for the company's latest offering - the record-breaking 18-35mm F1.8 DC HSM, which is the first constant F1.8 SLR zoom lens to hit the market. Most recently the 35mm F1.4 DG HSM impressed us with its exceptional optical quality at a very competitive price. The original (and recently-replaced) 30mm F1.4 EX DC HSM has long been one of our favourite lenses for APS-C SLRs, and the 50mm F1.4 EX DG HSM grabbed our attention back in 2008 due to its sharpness at large apertures. Over the past few years we've seen increasingly ambitious concepts appear from the company's design studios. This means it can no longer compete in the same way on price alone, and it's therefore switched its focus towards higher-value offerings. But this has changed over the part decade or so while other companies have shifted manufacturing to cheaper locations such as China and Thailand, Sigma has stubbornly refused to move from its factory in Aizu, Japan. In the film era it was best known for relatively inexpensive lenses that undercut the camera makers' own equivalents in terms of price. Should i just forget about fast lens and get something like a 21mm 3.Sigma has a long history as a lens maker, having been founded over 50 years ago. ![]() What lens are you replacing when you get the 18-35? I just wanted to know if there are other K-30 users waiting for this lens? ![]() In fact, after reading a lot of reviews, it seems that one of the things people complain the most about (shake reduction) would not be an issue in pentax as we have in body SR. But this lens is cheaper (than buying sepate limiteds), is faster (1.8 across the range) and highly acclaimed for sharpness. I know Pentax limiteds have nice color, nice contrast, are smaller. Besides, most reviews say that by 2.0 the lens is REALLY sharp!. ![]() You can say that image quality of the sigma at 1.8 is not "perfect" but capability is there. Is quite sad that Pentax does not offer something fast that is wide angle. Even Sigma's own primes 24mm, 28mm, 30mm (old) and 30mm (new) and finally the 35mm 1.4 all run for $400+ Considering this lens will most likely run for $700 or less street price in few months, i think is a no brainer considering that a "slow" pentax limited runs for $500 each. Hainvg the sigma 18-35 1.8 pentax mount around the corner made me think if this would be a good companion to the K-30. Considering photography is just a hobby for me and not a source of income, paying 1k plus for a lens is not really feasible. And as usual, if there are any lenses faster than that (like the 31 f1.8) then they are ridiculously expensive. All lenses below 30mm are f/3.2 or larger. I was looking at some fast primes but there is nothing from pentax in wide angle that is fast. However, After learning what a fast lens can give you (after trying my Pentax-A 50mm 1.7) I have never looked back to my Kit lens. I have a K-30 and I am really happy with it. ![]()
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