unsere Meinung: Eine günstige gekühlte Farbkamera mit hoher Empfindlichkeit und schöner Farbwiedergabe,
allerdings rauscht sie mehr als die ASI1600, und es gibt teilweise Probleme mit der Kalibration.
Wichtig ist, bei dieser Kamera nicht mit Bias zu arbeiten, sondern nur mit Darks und Flats,
und die Flats sind statt mit Bias mit Flatdarks zu kalibrieren (Darks mit der Belichtungszeit der Flats).
Zusätzliche Infos im ZWO Forum: ASI294 Kalibrationsprobleme
Resolution: 11.7MPixel 4144 x 2822
Pixel Size: 4.63µm
Exposure range: 32µs - 2000s!
Read Noise: 1.2e - 7.3e
Full Well: 63700e
ADC: 14 bit
Cooling: 40 - 45 degrees below ambient (obviously, only on the cooled version)
Standard Autoguider Port
Peak Quantum Efficiency: TBC
Full aluminum housing with standard 2" interface
M42X0.75 internal thread (T-thread)
Back Focus: 6.5mm (from camera front)
Back Focus: 17.5mm (from front of 11mm reverse thread adapter)
Similarly to the ZWO ASI1600MC camera, the ASi294MC camera would be
an excellent choice for imaging deep sky objects, however it can do much
more than that. With a max framerate of 19 FPS at 10 bit ADC and 16 FPS
at 14 bit ADC this camera can also be used as an extremely high
resolution planetary imager. If you cannot decide if your thing is deep
sky or planetary imaging, go for this camera. It is also a much more
affordable alternative to converting a dSLR.
You can even use it for guiding, although we understand that it is
somewhat a waste of a talent to use it for guiding, but there might be
special circumstances or setups when you would want to use it for
guiding, so the opportunity is given.
There are two versions with this same large 4/3" sensor (23.2mm diagonal):
Colour cooled or uncooled. (There is no monochrome version of this sensor.)
If you would mainly use it as a deep sky imager camera, wed also
recommend to go for this COOLED version, but if you cannot afford or
youd be mainly using it as a very high resolution planetary imager,
then go for the UNCOOLED version.
This product listing is for the
COOLED version of the ASI294MC. This cooled version is part of the PRO
series of cooled ZWO cameras that features a DDR memory buffer.
With the ZWO ASI294MC you wont have to spend lots of time to get
beautiful images, however, if you want to get the best results from this
range of cameras and you have plenty of time to spare, why not to try
L-RGB or narrow band photography with the monochrome version of the
similar ZWO ASI1600MM or ZWO ASI1600MM-COOL. (If you go for the
monochrome version, youll also need a filter wheel and a set of L-RGB
filters, plus H-alpha, OIII and SII filters, and maybe even H-beta
filter as well for narrow band photography...)
Please note that the sensor diagonal size is very close to the
internal clear aperture of a 1.25" filter, therefore with extremely fast
telescopes (small f-ratio) there might be vignetting. The limiting
f-ratio will depend on the telescope and whether you will use any
filters with this camera. Although its a colour camera, good results
can be achieved by using filters against light pollution and even
H-alpha or other narrowband filters in certain setups.
Features of the NEW ZWO ASI294MC-PRO
Recommended for Deep Sky Imaging as well as the Sun, Moon and planets
at very high resolution (although monochrome ASI174 would be better for
(To image the Sun youll have to use a proper front solar filter or
Herschel wedge depending on your telescope. Please contact us if not
High-Sensitivity Type 4/3 CMOS Image Sensor that Supports 4K for Astronomic Cameras and Industrial Applications
The “IMX294CJK” is the first in-house
image sensor for astronomic cameras to adopt the Type 4/3 format, and
realizes output of the number of pixels needed for 4K at 120 frame/s (in
ADC 10-bit output mode, ASI294MC can run up to 25fps at 4k format base
on USB3.0 bandwidth). In addition, use of a large-size pixel achieves
SNR1s of 0.14 lx* which is very close to the value of ASI224(0.13 lx*).
Exceptional low-illumination performance
Exceptional low-illumination performance
of SNR1s: 0.14 lx is realized by use of a large-size optical system and
by expanding the area per pixel to 4.63 µm. This makes the IMX294CJK
ideal sensor for astronomic camera market applications which requires
DDR Memory Buffer
Pro camera includes a 256MB DDR3 memory buffer to help improve data
transfer reliability. Additionally, the use of a memory buffer minimizes
amp-glow, which is caused by the slow transfer speeds when the camera
is used with a USB 2.0 port.
Even when used in higher humidity environments, ASI294MC Pro will still works fine without dew problems.
ASI294MC Pro has same mechanics as
ASI1600 Pro. There are four screws that seal the sensor chamber. Our
camera design has been extensively tested and is very stable.
This camera can achieve higher SNR (signal to noise ratio) with just one single exposure.
63700e full well capacity, which is 3
times more than the ASI1600s capacity. Even bright stars wont saturate
under long exposure.
Full well Capacity
HCG mode will be on when gain is higher than 120 (12db), read noise will drop below 2e but same dynamic range (13 stops).
ASI294 have 14bit ADC and it can achieve 13 stops dynamic range which is even better than ASI1600.
14bit ADC & 13 stops DR
The DDR memory buffer is the main difference between ASI “COOL” and “PRO” cameras.
The IMX294 sensor is a BSI (backside
illuminated type) sensor, which has very high QE (quantum efficiency,
which we estimate is over 75% peak).
The dark current of the ASI294 is slightly higher than the ASI1600, based on our test results.
Dark frame sample @ Highest dynamic range settings, 300s, -10degree, bin1.
Using a battery with 9-15V is also suitable for the cooler power supply.
cooler power supply: 12V @ 3-5A (or more) DC adapter (2.1×5.5mm, center
pole positive). Also suitable: DC battery with 9-15V.
USB 3.0 Port: Provide
5Gb bandwidth to make it possible for ASI294 Pro to run at 16 fps
(14bit, normal mode) or 19 fps (10bit, high speed mode) at full
USB 3.0 Port & USB2.0 HUB
USB 2.0 HUB:
can connect with various accessories, such as filter wheel, guide
camera and electronic focuser, so you can better manage your cables. The
ASI294 Pro includes two short 0.5m USB 2.0 cables. The integrated USB
2.0 hub is powered by the external power source if you connect one.
ASI294 VS ASI1600
The ZWO ASI294MC-PRO has a two-stage TEC
cooling system that allows deep cooling to 35°C-40°C below ambient. You
will need an external power supply to power the cooler. As user might
want to power it in various ways (i.e. from a power tank, a Primaluce
Lab Eagle 2 or mains, an AC-DC power adapter is not included in this
package, however you can order one from us. Click here!
The following table provides a comparison
of the differences between the ASI294 and ASI1600. One cannot say which
one is better as there are pros and contras for both; they are simply
different. It would depend on the application, optical system used and
the imaged object which camera would have to be favored.