Replacing the Panasonic G6, the G7 sits beneath the Panasonic GH4 in
the company's line-up of compact system cameras. It's the smaller of the
two SLR-like models and is aimed at enthusiast photographers. It sits
alongside the rectangular Panasonic GX7 and above the GF7, GM1 and GM5.
Every
Panasonic interchangeable lens camera briefing recently seems to have
started with the words 'it's got the same sensor as the GX7', and it's
the same with the G7. This means the new camera has the same resolution
as the camera it replaces, 16MP, but the sensor is newer (albeit still
two years old). This sensor is coupled with the Venus Engine 9
processing engine found in the GH4 and, according to Panasonic's
Michiharu Uematsu, this combination produces the best image quality of
any Panasonic camera. It also enables a native sensitivity range of ISO
200-25,600 with a low expansion setting of ISO 100. The G6 has a native
range of ISO 160-12,800 with an expansion setting of 25,600, so we can
assume an improvement in image quality at the higher sensitivity values.
The G7 now uses Panasonic's best sensor and processor combination for image quality.The
G7's Venus Engine image has a quad-core CPU for faster processing and
this enables full-resolution continuous shooting at 8 fps (frames per
second) in Single-AF mode or 6fps in Continuous AF mode. That's 1fps up
on what the G6 can muster in each autofocus mode.
If you want to
shoot at a faster rate you have to drop the image size to 8 million
pixels –that's still large enough to make A4 prints – and use the 4K
Photo modes to shoot at 30fps. This uses the G7's 4K video technology to
shoot a sequence of images for up to 29 minutes 59 seconds. It's then
possible to extract the 8Mp still images from the footage in-camera.
4K Photo mode lets you shoot 8MP stills at 30fps for up to 30 minutes.In
4K Burst Shooting mode, shooting continues for as long as the shutter
release is held down. Similarly, in 4K Burst (Start/Stop) mode,
recording is started with a press of the shutter release and is stopped
by a second press. Meanwhile in 4K Pre-burst mode, sensor scanning
starts as soon as the mode is activated and the 30 frames before the
shutter release is pressed are recorded along with 30 frames after,
giving 60 images from the two seconds of recording.
These 4K burst
modes can be used in any exposure mode and in 4K Burst Shooting and 4K
Burst (S/S) modes it's possible to use image ratios of 16:9 (3840 x
2160), 4:3 (3328 x 2496), 3:2 (3504 x 2336) and 1:1 (2880 x 2880).
The G7 uses the DFD autofocus system of the GH4 for much faster autofocus.Panasonic
has also given the G7 the DFD (Depth from Defocus) focusing system
first seen in the GH4. This system uses lens data and looks at the
contrast of the scene at two different defocused points (images) to help
it calculate the correct focus point more quickly. As with the GH4,
Panasonic claims that this enables the G7 to achieve focus in just 0.07
sec, approximately half the time the G6 takes.
Although the G7 has
Wi-Fi connectivity, in a surprise change from the G6 and in an effort
to keep price down, there's no NFC (near field communication).
Panasonic has given the G7 a more angular look than the G6 it
replaces and there are a couple of changes to the control layout. On the
top-plate, for example, there are two fairly large dials for making
settings adjustments. The first of these surrounds the shutter release
and replaces the Function Lever on the G6, while the second is towards
the back of the plate and within reach of your right thumb. They both
feel well made and the camera responds quickly to their use. The front
dial is easier to use than the old Function Lever.
Panasonic has changed some of the controls on the top of the camera compared to the G6.Over
on the left side of the top-plate is a new drive mode dial, similar to
the one on the GH4. This dial has an option to select 4K Photo mode,
with the three options being selected in the menu by pressing the
Menu/Set button at the centre of the navigation controls on the back of
the camera.
It takes a little while to get used to shooting in 4K
Photo mode, especially Pre-Burst because you feel like you've missed the
action when you press the shutter release, but it works well. Panasonic
also makes it very easy to extract the 8Mp images in-camera. Hitting
the 'up' navigation key reveals all the shots in the sequence and you
then scrolling quickly through until you find the most interesting ones.
Pressing the Set/Menu button gives you the option to save the selected
frame as a JPEG.
As on the G6, the G7 has a vari-angle screen, as
well as an electronic viewfinder (EVF), for composing and review images.
With 2,360,000 dots the EVF has almost double the resolution of the
G6's finder and it's an OLED (Organic Light-Emitting Diode) unit. It
provides a good, clear view with plenty of detail. Meanwhile the 3-inch
touch-sensitive screen has had a little boost up from 1,036,000-dots on
the G6 to 1,040,000 on the G7. It is also very clear and responds to
touch quickly. Like most screens it suffers from reflections in direct
sun, but it's still possible to see enough information to compose an
image if you can't use the viewfinder.
The G7 has a fully articulating touch screen display.While
the G7 is fairly lightweight, it has a solid feel and the textured
coatings make the larger, comfortable front grip feel secure in your
hand.
When I tested the Panasonic GX7 back in August 2013 I found that it
produced high quality images and noise is controlled well up to about
ISO 6400, but speckling is visible at 100% in images taken at ISO 800
and higher. The GX7's JPEG files have little chroma noise (coloured
speckling), but there's some luminance noise – variation in brightness.
Some softening is also visible when ISO 3200 and above JPEG images are
viewed at 100% and simultaneously captured raw files have a little
chroma noise. However, it doesn't really become a major problem until
ISO 25,600 – which I would avoid using.
As the G7 uses the same
sensor as the GX7 we can expect the image quality and noise control to
be at least as good. However, bearing in mind that the new camera uses
the processing engine from the top-end GH4, it could be a little better.
The electronic viewfinder has a resolution of 2,360,000 dots – twice that of the G6 before it.In
the past we have found Panasonic's G-series cameras have very good
metering and white balance systems and this seems likely to continue
with the G7, but we will test it fully to find out when a production
sample becomes available.
So far I have only used a G7 in the
gloomy confines of a windowless meeting room, but the autofocus system
coped very well, getting the subject sharp quickly. It even managed to
focus the lens in very dark conditions, but naturally it was more
hesitant.
I will have the opportunity to shoot with a more up to
date pre-production sample immediately after the camera's announcement
and will be able to comment upon the use and performance of the 4K Photo
shooting modes in the very near future.
Early verdict
It's
unlikely that G6 users will feel tempted to upgrade to the G7, and some
may feel that the changes brought by the new camera are a little
pedestrian and predictable. However, the G7 showcases something that is
likely to become more relevant to photographers over the next couple of
years – 4K recording and the ability to extract 8Mp still images.
The
G7 does not bring a new sensor to the Panasonic range but it does
introduce many less obvious improvements – and the 4K Photo mode.While
the 4K Burst Shooting and 4K Burst (Start/Stop) modes may seem the most
logical uses of the technology, 4K Pre-burst mode is likely to be the
most useful to experienced stills photographers who are used to timing
shots carefully. This mode records at 30 frames per second for just two
seconds, one before the shutter release is pressed and one after,
capturing 60 images in total. This should be sufficient to capture the
correct bit of the action and provides scope for selecting the perfect
moment/expression without giving the photographer hundreds or thousands
of images to scroll through to find the one ideal shot.
Panasonic
also continues to offer one of the most well-rounded feature sets
available with a high quality OLED viewfinder, a vari-angle
touch-screen, Wi-Fi connectivity and plenty of control over features.
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