Atik 383L+ Kleur CCD camera
8, 3 miljoen pixels en koelen tot 40 graden celsius onder de omgevingstemperatuur, dit allemaal met een gewicht van slechts 500 gram!
De chip heeft pixels van 5, 4 micron en een formaat van 17, 6 x 13, 52, dus zeer geschikt voor ook de wat kleinere kijkers. De temperatuur kan op 0, 1 graad geregeld worden en er is een mechanische sluiter.
The new Atik 383L+ is an 8 Megapixel pixel camera using the Kodak KAF 8300 CCD. Over the
last few months a huge amount has been written about this CCD justifying its place in
astronomer's hearts. We can sum it up succinctly by saying it's a fabulous CCD with a huge
number of good sized pixels that is currently available at an irresistible price. This sensor
should redefine mid range astro-imaging making multi-megapixel, cooled, cameras much
So what of Atik's implementation? In the past Atik has prided itself on providing cameras
with the very highest image quality but at reasonable cost: we see no reason to change.
We have built on the success of our very highly regarded Atik 314 platform to support
Kodak's KAF 8300. This immediately offers a huge number of advantages including the very
low read noise circuits and the reliability from using this established design.
• 8.3 Million 5.4μm square pixels for
high resolution imaging.
• Ultra low read noise for great
• Lightweight - no flexure of the
telescope focuser tube.
• Highly efficient set point cooling to
40 degrees max below ambient.
• Great software for image
acquisition and pre-processing.
DIGITISATION AND IMAGE QUALITY
The key to any high quality camera is to convert the light collected by the sensor into digital
information while ensuring that as little noise is added as possible, and the digital image
truly reflects the light collected. This might appear complex to judge but fortunately there
are three simple tests which show how well the camera performs against these criteria.
Every camera will add some noise to
its images. The challenge is to add as
little as possible. To determine read
noise we simply look at the standard
deviation of pixel values in a bias
frame. This gives read noise in AD
units. Converting to electrons allows
comparison with other cameras. The
conversion factor for the Atik383L+ is
shown opposite to be 2.83 ADU per
electron. Using this, the read noise
of the Aik383L+ is 7.0 electrons. We
are unaware of any KAF 8300 based
camera giving a lower read noise.
OK we can see the Atik 383L+ adds
very little noise to its images. The
next test is to ensure that the pixel
values fairly represent the light that
fell on the CCD. These values should
respond linearly to increasing light.
The graph to the right shows this with
the camera having an extremely
linear response right up to the
saturation value of 65535.
y = 2.8301x - 3649.7
A camera can have low read noise and
good linearity but still show annoying
artifacts in its bias frames that can
appear in an image. The histogram from
the Atik 383L+ has the ideal shape of a
normal distribution. This allows faint
detail to be pulled out of the Atik's
383L+ images during processing and
background noise treated efficiently
Shutters present a particular challenge in camera
design. Being moving mechanical parts they can
be subject to some reliability issues. Up to this
point all the Atik cameras have used interline
CCDs that have electronic shutters. The Atik
383L+ uses a full frame CCD and requires the use
of a mechanical shutter. Rather than design this
in-house, which would require an extended
period of testing to determine reliability, we
have sourced a shutter from a established
company specialising in exactly this kind of
device. This will help to ensure the long term
reliability of the Atik 383L+
The Atik 383L+ features our most advanced
cooling system to date. We are using the
latest, high-efficiency Peltier modules, tiny
temperature sensors located under the CCD
and a centrifugal fan and heatsink. The fan
is especially important as it allows us to
move a lot of air over the heatsink while
running the fan slowly so causing no
vibration to the camera that might blur an
image. As can be seen opposite cooling is a
maximum of 40 degrees below ambient
rising slightly to 38 degrees below as the
system stabilises. The temperature of the
CCD can be set to 0.1 degree precision for
reproducible dark frames.
Cross flow heatsink above and in situ right
…. are too numerous to list but let's give it a try! The camera is powered by a single 12V
supply negating the need for bulky power packs in the field. The CCD chamber is kept
moisture free by using extremely efficient molecular sieves as desiccant. These will last
years in normal use, and when they need replacement it's a simple job not requiring the
camera to be opened.
desiccant plug (black)
The camera has a standard T thread connection on its front and can be used with our new
Filterwheel and Off Axis Guider unit. For focal ratios of F5 and above standard 1.25 inch
filters can be used without vignetting. Faster focal ratios will need flat field correction or
larger filters (36mm or 2 inch) . The camera body and shutter will work down to F2 without
The Atik 383L+ comes with our renowned Capture image acquisition software and Dawn our
innovative image processing application. So if you choose you do not need any 3rd party
software to take and process images from the camera. Should you wish to use Maxim,
Astro Art or CCD Soft then plug in are supplied.
We have taken our most popular camera, the Atik 314L+, and extended it to support the
Kodak KAF-8300 CCD. It's a dream combination of low noise electronics and scientific grade
sensor. Furthermore we are able offer the camera at a fantastic price.
Whether you are an established imager or just starting up, the Atik383L+ is a great choice.
The new Atik 383L+ is an 8 megapixel camera using the Kodak KAF-8300 CCD. Over the last few months a huge amount has been written about this CCD justifying its place in astronomers' hearts. We can sum it up succinctly by saying it's a fabulous CCD with a huge number of good sized pixels that is currently available at an irresistible price. This sensor has redefined midrange astro-imaging, making multi-megapixel, cooled cameras much more accessible. Atik prides itself on providing cameras with the very highest image quality but at a reasonable cost. We see no reason to change. We have built on the success of our very highly regarded Atik 314 platform to support Kodak's KAF-8300. This immediately offers a huge number of advantages including the very low read-noise circuits and the reliability of using this established design.
The key to any high quality camera is the ability to convert light collected by the sensor into digital information while ensuring that as little noise as possible is added. The digital image needs to truly reflects the light collected. The Atik 383L+ achieves this, having:
- Very low read-noise, 7 electrons, on par with many Sony sensors, enabling faint details to be detected.
- Great linearity, with a regression correlation coefficient of R =0.9998 over the range 1,000 to 64,000, making the camera suitable for sensitive photometric measurements.
- The bias frame histogram from the camera shows the ideal Gaussian shape indicating that maximum detail can be extracted on processing.
- The side of the Atik 383L+ showing the cooling vents of the cross-flow heat-sink that allows a T = -40 C max cooling to be achieved.
The Atik 383L+ is a dream combination of low- noise electronics and a scientific grade sensor that we are able to offer at a fantastic price. Whether you are an established imager or just starting, the Atik 383L+ is a great choice.