Sigma 18-35mm Autofocus: A Second Look
An analysis of focus issues on Pentax cameras
By PF Staff in Review Announcements on Feb 2, 2015
The Sigma 18-35mm F1.8 "Art" is an impressive lens. Not only is it the world's first DSLR lens with a fixed aperture of F1.8, but it has also proved to be an optical masterpiece with image quality and bokeh comparable to that of high-end prime lenses.
Unfortunately, in our in-depth review of the 18-35mm, our staff reviewer Heie discovered that the lens suffered from serious autofocus issues while shooting through the viewfinder. These initial findings were verified using five copies of the lens, at different times, across three different K-3 bodies among others. We therefore suspected a problem with how the lens interacts with the camera during phase detect autofocus (PDAF), as no issues were observed in the live view contrast detect autofocus (CDAF).
However, while many user reports agreed with our findings, other users stated that they haven't experienced any autofocus issues whatsoever. Thus, in an attempt to arrive at a more conclusive verdict regarding the 18-35mm's autofocus, our forum administrators decided to test two additional copies of the lens side-by-side. Read on for their findings!
Sigma 17-70mm F2.8-4 Contemporary Review
Latest walkaround lens from Sigma
By PF Staff in Review Announcements on Jul 16, 2013
Today we're happy to be bringing you our in-depth review of the new Sigma 17-70mm F2.8-4 "Contemporary" zoom lens. This lens, which started shipping for Pentax in late May, is the first member of Sigma's new lens lineup to become available for Pentax. The 17-70mm is also available in a variety of other mounts.
As a wide-angle to short-telephoto zoom lens with a fast maximum aperture of F2.8 to F4 and macro capabilities, this versatile lens is excellent for everyday shooting. As you will read in the review, we were positively surprised by its performance, and will go as far as saying that this is one of the best walkaround lenses that we have tested to date- read on to learn more!
We highly recommend this lens if you're considering upgrading your kit lens or looking for a walkaround lens with solid optical performance at an affordable price.
Click here to continue to the review | Click here to get the lens for $499
HD DA 55-300 WR Review Posted
In-depth review and DA* 60-250 comparison
By Heie in Review Announcements on Jan 27, 2014
Today we are proud to present our in-depth review of Pentax's latest telephoto zoom, the HD Pentax-DA 55-300mm F4-5.8 ED WR. It's not exactly a brand new lens, as it marks the third official variant of the highly popular DA 55-300mm F4-5.8 ED lens; the most notable change is the addition of weather sealing.
Can a $400 lens outperform a $1300 lens? In this review we've dedicated six full pages to comparative tests and photos against the highly regarded Pentax DA* 60-250 F4.
Just like "Mark II" and "III" products inherit design elements from their predecessors, the HD 55-300 is no different. Compared to the SMC 55-300mm that came before it, the HD 55-300mm has the same optical and mechanical design. But we couldn't be happier to see the 'WR' signature added to the lens, designating its weather resistant capabilities. And the new HD coating promises to reduce ghosting and improve micro-contrast.
So continue on to read one of our most comprehensive lens reviews to date to see what its strengths and weaknesses are, and to see how it compares to a professional zoom.
Pentax K-3 In-Depth Review Posted
A review of Pentax's Flagship DSLR
By Heie in Review Announcements on Nov 12, 2013
We are happy to announce that we have just published our in-depth review of the Pentax K-3, our most comprehensive review to date with more than 20 pages covering the performance and features of the new Pentax flagship! We hope that this review answers all your questions about the K-3 and addresses any concerns that you may have had about the camera.
There's no question that the Pentax K-3 is the most capable camera in the current Pentax lineup as well as one of the most compelling products that Pentax has released to date. The detail that this camera's 24-megapixel sensor delivers has impressed us, as has its high overall speed and large feature set. All-around, this camera was a joy to review: the K-3 it turned out to still have everything that what we loved about the K-5 and K-5 IIs, and yet Pentax still managed to improve it in just about every key area compared to its predecessor. With the possible exception of autofocus and video, this camera will surely hold its ground against the competition extremely well.
We've been waiting a long time to say, "Bravo, Pentax, for creating such a nice camera for enthusiast Pentaxians!"
Click on the link below to continue to the full review and see just how well the K-3 fares.
Pentax Q7 Review Posted
In-depth look at Pentax's latest ultra-compact mirrorless
By PF Staff in Review Announcements on Sep 17, 2013
Today we're happy to be bringing you our in-depth review of the Pentax Q7, the latest member of Pentax's lineup of ultra-compact interchangeable lens cameras.
The Q7 represents the first major upgrade to the Q-mount family of cameras. Although Pentax released their second Q-mount body, the Q10, just last year, it was identical to the original Q in almost every way except for its appearance. While the Q7 and Q10 share the same casing, on the inside, they are completely different.
Pentax has brought a plethora of changes and improvements to the Q7. First and foremost, they have fitted it with a new 1/1.7-inch sensor that is some 50% larger than the old 1/2.3" sensor, promising improved image quality. The Q7's menu system has seen a facelift, with almost every screen being changed in some way. Its performance and startup time has been improved, and the autofocus system has been overhauled. Despite these modifications, the Q7 of course continues to be a niche camera appealing primarily to those who prioritize small size above all else, and who crave the ability to swap lenses.
If you're a current Q user, you might be surprised by the improvement in image quality that the Q7 brings to the table. We've devoted much of our review to comparing the Q7 to its predecessors, but we also evaluate the Q7 on its own, from the standpoint of a prospective buyer interested in a mirrorless camera. We hope you find the review helpful in deciding whether or not the Q7 is right for you!
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