How much are you willing to sacrifice to shave an inch off your camera? That's the question Pentax tacitly raises with its introduction of the Q interchangeable-lens camera (ILC), a model with a body the size and weight of a point-and-shoot (without lens, of course)--and the price of a dSLR. The company achieves this feat of shrinkage by incorporating a tiny 1/2.3-inchCMOS sensor, which in turn allows for a smaller-than-usual lens mount and more compact lenses. And it looks like there will be a lot to like in the Q--it's got an attractive, retro look; a light but solid body; well-designed flash; and enthusiast-friendly features like 1080/30p video capture and time lapse. But the drawbacks. Oy, the drawbacks. And all to lose that extra inch. (Okay, it's not exactly an inch: it's 1.3 cubic inches smaller than the NEX-C3.)
To give you some sense of how small a 1/2.3-inch sensor is, the Q lens mount is roughly 67 percent smaller than Pentax's traditional APS-C K-mount. It has a 5.5x magnification factor, compared to 1.5x for APS-C-based ILCs or 2x for Micro Four Thirds models. That means, for example, that an 18mm lens which produces the equivalent angle of view of 27mm on a Sony ILC or 36mm on an Olympus or Panasonic ILC, would produce a 99mm-equivalent on the Q. As a result, producing a wide angle lens for this camera will be very, very difficult.
The small sensor impacts depth-of-field (DOF) as well. The smaller the sensor, the shorter the focal length needs to be to produce a given shallow DOF (i.e., blurring in front of and behind from the focal plane of the subject) at close distances. But as I just mentioned, producing the necessary wide-angle lens will be difficult. Pentax implicitly acknowledges this problem by supplying a bokeh-control filter in the camera. Other ILCs and point-and-shoots also include this capability, usually called "background defocus." But the Q will really need it. (You can play around with this great DOF calculator to see what I mean.)
The small lens mount introduces further complications. None of the ILCs can natively handle lenses designed for APS-C or full-frame cameras, but they all provide adapters to facilitate backward compatibility. Pentax has no plans to ship an adapter for old lenses. That's a huge disincentive for the Pentaxians who might otherwise be lining up to buy the Q. I think a niche third-party would probably step in to fill the void, but the fact that Pentax isn't doing it signals to me that there are some technical challenges beyond just incongruous sizing that may surface here.
Then, of course, is the issue with the sensor itself. BSI technology was developed to improve the low-light sensitivity of small sensors. And it works great for that. But at least in all the BSI cameras we've seen, the image quality has been great for inexpensive to midprice point and shoots. Compared to the even modestly larger non-BSI sensors in enthusiast cameras like the Canon PowerShot G12 or Panasonic Lumix DMC-LX5, the daylight images aren't quite as good. That said, the Q uses the most recent Sony BSI sensor (likely also used by the Nikon Coolpix P300) and Pentax dropped the antialiasing filter, so it might deliver better results than we've seen historically.
However, it's telling that two of the five lenses Pentax will ship at launch are so-called "toy" lenses (a 35mm "wide" and a 100mm telephoto for $79.95 each) and one is a fish-eye ($129.95): all are cheap lenses designed to maximize the fun but not the photo quality. The standard 24-80mm f2.8-4.5 lens won't be part of a kit and will run $299.95. Instead, the kit will include a 47mm-equivalent f1.9 lens.
Here's the rub: if the Q were targeted at mainstream consumers, a lot of this probably wouldn't matter. But it's targeted--and priced--for enthusiasts, who do care about this stuff.
According to the press release, "the Q carves out an entirely new camera category that extends beyond traditional digital compact, APS-C or 4/3 digital cameras." This is a bit disingenuous; the Q isn't so much smaller than models like the Panasonic Lumix DMC-GF3 or Sony NEX series that it's in a category all by itself. All of them are jacket-pocket-friendly equipped with a pancake prime lens, but none of them are with a standard zoom. The Q's body is roughly the size of the Canon PowerShot S95, but as with all ILCs, the lens can't retract into the body and so, unless you have TARDIS pockets, there will always be an issue. It is lighter, though, and like Panasonic and Olympus, the lenses are much lighter than Sony's E-mount offerings. If not for size, I'm not sure exactly what niche Pentax thinks it's carving out. Retro? Olympus got there first. Overpricing? Everyone else has been there, still doing that, though at $800 Pentax seems to be trying to outdo the crowd.
In fact, no matter how you categorize it, there seem to be a surfeit of competitive options, which include compact ILCs or enthusiast compacts. Here's how it stacks up compared to the ILCs:
|Pentax Q||Sony Alpha NEX-C3||Sony Alpha NEX-5|
|Sensor (effective resolution)||12.1-megapixel Live MOS||12.4-megapixel BSI CMOS||16.2-megapixel Exmor HD CMOS||14.2-megapixel Exmor CMOS|
|17.3 x 13.0mm||1/2.3-inch||23.5mm x 15.6mm||23.4mm x 15.6mm|
|Sensitivity range||ISO 100 - ISO 6400||ISO 125 - ISO 6400||ISO 200 - ISO 12,800||ISO 200 - ISO 12,800|
unlimited JPEG/7 raw
18 JPEG/ 6 raw
(5.5fps with fixed exposure)
unlimited JPEG/8 raw
(7fps with fixed exposure)
magnification/ effective magnification
|None||Optional optical for prime lens||None||None|
|Autofocus||23-area contrast AF||25-point contrast AF||25-point contrast AF||25-point contrast AF|
|Shutter speed||60-1/4000 sec; 1/160 sec x-sync||30-1/2000 sec.; bulb; 1/125 sec flash sync||30-1/4000 sec.; bulb; 1/160 sec flash sync||30-1/4000 sec.; bulb; 1/160 sec flash sync|
|Metering||144 zone||n/a||49 zone||40 segment|
|Flash||Yes||Yes||Included optional||Included optional|
|Image stabilization||Optical||Sensor shift||Optical||Optical|
|Video|| 1080/60i/50i @ 17 Mbps
720/60p @17 Mbps AVCHD or Motion JPEG QuickTime MOV
1080/30p H.264 MPEG-4
|720/30p H.264 MPEG-4 MP4||1080/60i AVCHD|
|Audio||Mono||Stereo||Stereo; mic input||Stereo; mic input|
|LCD size||3-inch fixed touch screen
|3-inch fixed touch screen
|Battery life (CIPA rating)||320 shots||230 shots||400 shots||330 shots|
|Dimensions (inches, WHD)||4.2 x 2.6 x 1.3||3.9 x 2.3 x 1.2||4.4 x 2.4 x 0.9||4.4 x 2.4 x 1.6|
|Body operating weight (ounces)||9.3 (est)||7.1 (est)||10.7||10.2 (without flash); 10.9 (with flash)|
|Mfr. Price||$599.95 (with 14-42mm f3.5-5.6 lens)||n/a||$649.99 (with 18-55mm 3.5-5.6 lens)||$699.99 (with 18-55mm 3.5-5.6 lens)|
|$699.95 (with 14mm f2.5 lens)||$799.99 (with 47mm-equivalent f1.9 lens)||$599.99 (with 16mm f2.8 lens)||$649.99 (with 16mm f2.8 lens)|
|Ship date||July 2011||Fall 2011||August 2011||July 2010|
The Q has a couple of advantages, including 1080/30p video, in-camera image stabilization that's effective during movie capture and a standard hot shoe. And while the burst performance on all of these is suboptimal, the Pentax seems exceptionally lame; it's 5fps, but only for a second. And who knows how long it will take to save the five images. It has a low resolution, fixed LCD, and seriously sad battery life; I hope the latter gets fixed before it ships. Performance is an important unknown here, but as it didn't come up during briefings as one of the design goals of the camera, I suspect it won't break any records. I really would expect it to cost less than these competitors, not more; that 1.3 cubic inches just isn't worth it to me.
Here are some compact cameras that I think many people will be considering instead as well:
|Sensor (effective resolution)||10-megapixel CCD||12-megapixel BSI CMOS||12.4-megapixel BSI CMOS||10-megapixel CCD|
|Sensitivity range||ISO 80 - ISO 3200||ISO 160 - ISO 3200||ISO 125 - ISO 6400||ISO 100 - ISO 6,400|
|Closest focus (inches)||2.0||1.2||n/a||0.4|
23 JPEG/8 raw
|Viewfinder||Optical||None||Optional optical for prime lens||Optional EVF|
|25-point contrast AF||11 area
|Metering||n/a||224 segment||n/a||324 area|
|Shutter||15-1/1600 sec||8-1/2000 sec||30-1/2000 sec.; bulb; 1/125 sec flash sync||60-1/2000 sec; bulb to 16 min|
|3-inch fixed touch screen
|3-inch fixed OLED
|Image stabilization||Optical||Optical||Sensor shift||Sensor shift|
|Video (best quality)||720/24p
H.264 QuickTime MOV
|1080/30p H.264 QuickTime MOV
|1080/30p H.264 MPEG-4||720/30p Motion JPEG AVI|
|Manual iris and shutter in video||No||No||Yes||No|
|Optical zoom while recording||No||Yes||n/a||No|
|Battery life (CIPA rating)||220 shots||240 shots||230 shots||320 shots|
|Dimensions (WHD, inches)||3.9 x 2.3 x 1.2||4.1 x 2.3 x 1.3||3.9 x 2.3 x 1.2||4.4 x 2.6 x 1.7|
|Weight (ounces)||6.8||6.7 (est)||7.1 (est)||9.6|
|Mfr. Price||$399.99||$329.95||$799.99 (with 47mm- equivalent f1.9 lens)||$499.99|
|Availability||August 2010||March 2011||Fall 2011||January 2011|
As we've seen for years, you don't need interchangeable lenses to get creative, and the not-inconsiderable price difference between the Q and otherwise similarly specced compact models would give me pause as a buyer. And the biggest irony is that the fixed-lens cameras still offer a broader focal range than will initially be available for the Q system. (The Q's future includes a telephoto and an "ultra wide" but Pentax didn't offer much detail.) The Q may have some advantage over any given model in some aspect--for instance, the P300 doesn't support raw while the Q produces DNG files--but overall its only substantial perk is the lens mount.
In terms of features, the Q is pretty typical for any modern camera. There are Smart Effects, the usual assortment of shooting effects plus the more unusual Cross Process option; you can combine them. It also offers a time-lapse shooting mode, which I'm surprised more cameras don't offer, and customizable presets. There are a couple of unique aspects to the design, including a clever flash that pops way up to decrease the occurrence of red eye. A dial on the front of the camera can be used to change settings contextually; I'll reserve judgment on that, because it seems an odd choice. And unfortunately, the camera lacks a dedicated movie-record button.
I don't think the Q was designed with the U.S. market in mind. We like small, but not at any cost. So it makes sense that Pentax is shipping the Q in Japan during the summer, while it's slated for a fall release here. It remains to be seen whether the trade-offs Pentax made to make it small were worth it, given how late to market the company is and how expensive the camera turned out. Despite everything, I really would like to be surprised.