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發表於 2013-10-15 16:15:04
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diglloyd's comment's
TUESDAY, OCTOBER 15, 2013 - SEND FEEDBACK
Search: Sony A7
Sony A7, A7R: Breakthrough in Image Quality in a Compact Package with Killer EVF and LCD Too
Regrettably the Sony press embargo is late at night when I hope to be sleeping up at 11,000' elevation or so after a long day’s drive! So maybe this shows up in the morning.
Search for the Sony A7 at B&H Photo for pre-order.
I can’t possibly do justice to the new Sony offerings given my travel schedule, but I wil be reviewing the A7R in great detail in Guide to Mirrorless, and probably the A7 along with it, and perhaps even the RX10 as well.
Readers know that the Sony RX1R was a stellar camera in my testing, but having a high-res EVF built-in along with a high-res rear LCD (notably higher-res than Nikon/Canon) is very attractive. But there is a lot more than that to the new Sony offerings.
Can the lenses deliver fully to 36 megapixels? I’ll got out on a limb and tenatively suggest that the new 35mm f/2.8 Sonnar on the Sony RX1R might well make the Nikon D800E look dated: the sensor is 18-24 months further along (and is 14-bit), and the lens has been designed for it.
As well, lens adapters allow the use of Leica M lenses and many others (Nikon, Sony Alpha lenses, etc). It remains to be seen whether ray angle is a problem for wide angle lenses, but let’s cross our fingers on that one.
Sensor Sizes
Sensor Sizes
Size and weight
Is there anyone that still seriously insists that Micro Four Thirds is compelling on a size weight basis?
As I wrote several months ago in those editorials, APS-C and full frame offer a vastly larger sensor at similar or lower weight!
OK, we can show some scenarios to argue with that, but let’s look at one real-world case. Small variations are just not relevant to the core idea, which is that the weight difference is more modest than one might think.
Compare the size and weight:
Sony A7R: 465g with battery and card + 120g for the 35/2.8 lens.
Olympus E-M1: 497g with battery and card + 120g for the Olympus 17mm f/1.8 lens.
Wow. The Sony A7R full frame camera with equivalent lens is lighter than the equivalent Olympus E-M1 Micro Four Thirds setup.
Actually, the ƒ/2.8 lens on full frame would have to be ƒ/1.0 (!) on MFT to be equivalent in depth of field and blur potential. So the Sony wins there also.
Oh, and the Sony A7R has 36 megapixels in which each of those pixels is larger in area than the 16 megapixels of the E-M1. 2.25X the pixels in 3.8 times the area = more and larger and higher quality pixels. Case closed for anyone looking for image quality at similar size/weight equivalence, at least for the ~35mm focal length.
The camera and lenses
Below are some photos of the new Sony A7 / A7r. The A7 and A7R are pretty awesome by the spec list, including 24 and 36 megapixels sensors respectively, along with the best EVF and rear LCDs yet seen together on any camera.
The lens line is a weakness, but with the range of 24-200mm covered high quality zooms, along with adapters for various lenses, this limitation is not so significant for most shooting. Still, the Nikon/Canon folks might want to change their underwear because the Sony A7R is the camera that could really eat into the sales of the intertial nothing-really-new-it’s-2008 DSLRs. Heck, neither company has yet to understand than an EVF is a terrific addition to any camera.
The 24-70mm f/4 zoom
The A7R with the 24-70mm f/4 zoom is a chunky package, but no doubt will appeal to those who like to cover a zoom range, my advice being that zooms serve a useful function in certain situations, but a fixed lens tends to make the photographer think more carefully about perspective and composition—less is more.
Part of the appeal of the A7R is its relatively small size, but with the 24-70 zoom at 460 grams, it becomes more substantial. Still, this is probably very acceptable, and that ƒ/4 aperture keeps the weight to a reasonable level. Whether it can deliver top image quality to a 36-megapixel sensor is an open question.
Sony Alpha A7R with Sony/Zeiss ZA FE 24-70mm f/4 ZA Vario Tessar OSS lens
Sony Alpha A7R with Sony/Zeiss ZA FE 24-70mm f/4 ZA Vario Tessar OSS lens
The 35mm f/2.8 Sonnar
At a featherweight 120 grams, the 35mm f/2.8 Sonnar looks to offer a really appealing package. It’s quite possible that the lens performance will be as good as the 35mm f/2 Sonnar found in the Sony RX1R, since the loss of one stop allows a higher degree of correction with less strenuous optical efforts.
Sony Alpha A7R with Sony/Zeiss FE 35mm f/2.8 Sonnar ZA
Sony Alpha A7R with Sony/Zeiss FE 35mm f/2.8 Sonnar ZA
Sony Alpha A7R with Sony/Zeiss FE 35mm f/2.8 Sonnar ZA
Sony/Zeiss ZA FE 35mm f/2.8 Sonnar
The 55mm f/1.8 Sonnar
The 281 gram 55mm f/1.8 is a Sonnar design, and it surely is not an APO-Distagon.
Sony/Zeiss FE 24-70mm f/4 ZA OSS lens
Sony/Zeiss ZA FE 55mm f/1.8 Sonnar
The 70-200mm f/4 OSS
The 840 gram (without tripod collar) ZE FE 70-200mm f/4 OSS keeps the weight down by its ƒ/4 aperture.
Sony/Zeiss FE 70-200mm f/4 ZA OSS lens
Sony/Zeiss ZA FE 70-200mm f/4 ZA OSS lens
http://webcache.googleuserconten ... 015_2-Sony-A7R.html
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發表於 2013-10-15 16:19:59
