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Moravian G4-16000 Mark II Enhanced Cooling CCD camera with 7 position filter wheel for 50x50 mm filters and M68 off-axis guider

This package includes the Moravian G4-16000 Mark II Enhanced Cooling version CCD camera with 7 position filter wheel for 50x50 mm square filters and M68 off-axis guider. Filters not included, please inquire us for an offer filters included (Astrodon, Astronomik, Baader Planetarium, Optolong, ...).

8 949,00 €

-376,00 €

9 325,00 €

Pack description

This package includes the Moravian G4-16000 Mark II Enhanced Cooling version CCD camera with 7 position filter wheel for 50x50 mm square filters and M68 off-axis guider. Filters not included, please inquire us for an offer filters included (Astrodon, Astronomik, Baader Planetarium, Optolong, ...).

Pack content

Moravian G4-16000 Mark II CCD camera

Moravian G4-16000 Mark II CCD Camera with KAF-16803 16 Megapixel (4096 x 4096 pixels) ABG monochrome CCD. The reference wide-field imaging platform suitable also for scientific research.

ModelCCDABGColour mask
ResolutionPixel sizeImage areaDownload time (preview mode / low noise mode)
G4-9000IIKAF-09000100xno3056 x 305612 × 12 μm36.7 × 36.7 mm4.17 s / 5.77 s
G4-16000IIKAF-16803100xno4096 x 40969 × 9 μm36.9 × 36.9 mm7.19 s / 10.03 s

OnSemi KAF-16803 CCD specifications

  • Resolution: 4096 x 4096 px (9 Mpx)
  • Pixel size: 9 x 9 μm
  • Image area: 36.9 x 36.9 mm 
  • Full well capacity: ~100,000 e-
  • Anti-blooming gate: 100x
  • Dark current: 3 e-/s/pixel at 25 °C
  • Dark signal doubling temperature: 6.3 °C

G4 cameras use OnSemi Full-Frame CCD detectors with ABG (anti-blooming gate), ensuring images without excessive charge leaks from the overexposed portions of the image (blooming), e.g. bright stars in the field of view. ABG of these CCDs is designed for relatively low light levels (100× of saturation signal, compared to e.g. 300× of saturation signal ABG level of KAI-4022 CCD or 1000× of saturation signal ABG level of KAF-8300 CCD, intended for taking of images against sun etc.). Low ABG level does not to disrupt linear response to light.

Moravian G4 Series Mark II

Cooled CCD cameras of G4 Mark II series contain detectors with 36 × 36 mm area, which is 50% more than photographic “full-frame” format. G4 camera dimensions are the same like dimensions of G3 series, with the exception of camera head thickness—G4 cameras are somewhat slimmer, because they do not contain internal filter wheel. Also camera handling, software control, power supply and connection to the host PC using fast USB 2.0 interface is the same like in the case of G3 cameras.

Filter wheel for 50 × 50 mm square filters (round filters of 50 mm diameter cause vignetting on such large CCD chips) cannot be placed inside the camera head due to limited space. But it is possible to connect external filter wheel for 5 large filters to the G4 camera, the camera head already contains connector for external filter wheel control.

G4 cameras contain Full-Frame CCD chips OnSemi KAF with 36 × 36 mm detector area. These detectors are equipped with so-called “anti-blooming gate” (ABG), which drains the over-abundant charge from saturated pixels. ABG ensures the round images of bright stars, without disruptive blooming spikes. On the other side, compromising of the CCD linearity by ABG is only negligible. G4 cameras can be used for astrometric and photometric applications as well as for astrophotography. No matter if your target is reliable scientific data or beautiful images of deep-sky objects, G4 CCD cameras are able to provide both.

G4 camera head is designed to be easily used with a set of accessories to fulfill various observing needs. G4 cameras do not allow usage of internal filter wheel as they require large 50 × 50 mm filters. External filter wheel is then the only option for G4 camera.

There are three size of the external filter wheel available for the G4 Mark II cameras:

  • Medium size wheel for 5 square filters 50 × 50 mm (EFW-4M-5-II)
  • Large size wheel for 7 square filters 50 × 50 mm (EFW-4L-7-II)
  • Large size wheel for 9 round filters 50 mm (EFW-4L-9-II)

Camera head and numerous accessories comprise imaging system, capable to be tailored for many applications.

16-bit A/D converter with correlated double sampling ensures high dynamic range and CCD chip-limited readout noise. Fast USB interface ensures image download time within several tens of seconds.

Maximum length of single USB cable is 5 m. This length can be extended for instance to 10 m by using single USB hub or USB active extender cable. Up to 100 m extension can be achieved with third-party extender.

Image download time depends on the CCD chip used in particular camera model. Also the read noise depends on the chip as well as on the read mode.

  • Standard read mode provides system read noise approx. 1 e- above CCD chip read noise.
  • LN (Low-noise) read mode is somewhat slower (approx. 1.2×), but ensures system read noise equal or smaller than the manufacturer-specified chip read noise.

All members of the G4 series share the same design, making them powerful research and imaging tools:

  • Lowest possible read noise, limited by CCD detector itself
  • Uniform frames without artifacts.
  • High dynamic range, 16-bits digitization.
  • Efficient and precisely regulated cooling with optional heat exchanger for liquid coolant.
  • Compact camera head, small and lightweight enough to be attached even to small telescopes.
  • Integrated all-in-one design with USB and power connectors directly on the camera head.
  • Integrated mechanical shutter not to bother with covering the telescope when taking dark frames.
  • Optional external filter wheel.
  • Single-voltage power supply enabling operation from 12V battery or “brick” adapter.
  • Plug and play installation.
  • Robust construction to sustain every-day usage.
  • Rich software support.

New features of the Mark II series

With the introduction of the Mark II series Moravian developed some improvements over the previous series. Main improvement could be found in the new, faster electronics that allows faster download times (around 2.5x better over the previous series) delivering also a small improvement of the read noise, now purely CCD-limited. Improvement of the main electronics allowed also for a better linear response of the sensor itself. If the previous serie was already good enough for scientific research, the new Mark II series is even better!

Another improvement introduced with Mark II series is the complete redesign of the scope adapters: now any adapter comes with a tip-tilt plate that allows for the fine adjustment of the sensor-plane.

Least but not least, there was also a redesign of the camera aspect.

Data sheet

LeasingAt standard interest

Moravian EFW-4L-7-II external filter wheel for Moravian G4 Mark II Series ccd cameras. Included carousel carries 7 x 50 mm square unmounted filters.

Moravian filter wheels

The ability to capture individual exposures through various filters is one of the key features of the cooled CCD cameras, regardless if being used for scientific research or for astronomical photography. This is why the Gx CCD cameras were designed to include the filter wheel inside the camera head and to integrate filter wheel control into camera control from the beginning. When more than 5 or 6 filters are necessary or the filter wheel has to be used with G4 camera, the filter wheel is too large to be placed inside the camera head. External filter wheel is then the only option.

When there is no filter wheel inside the camera head, all electronics and firmware, intended to control it, stays idle. These components can be utilized to control external filter wheel with only little changes. Also the camera front shell can be manufactured thinner, the space for filter wheel is superfluous. The G2 and G3 camera design, allowing attaching of the external filter wheel, differs from the variant with internal filter wheel in two points:

  • Digital electronics PCB is not equipped with internal connectors for filter wheel control, but all necessary signals are routed to single 8-pin RJ-45 connector. This connector is placed between power and USB connectors on the bottom side of the camera shell.
  • Camera front shell is 12.5 mm thinner compared to shell for cameras with internal filter wheel. Back focal distance measured from camera front plane is lowered from 29 mm to 16.5 mm.

Controlling of the external filter wheel with electronics already present in the camera head eliminates the necessity to connect the external filter wheel to the host PC (with separate USB or serial cable) as well as to plug in a separate power supply. Only single short 8-wire cable connects the external filter wheel with the camera head.

Another advantage of this design is full compatibility with all software for Gx camera control. External and internal filter wheels are indistinguishable from the software point of view (besides the fact, that external wheel often offers more positions). The SIPS camera control software and also other programs using supplied drivers (The Sky, MaxIm DL, AstroArt or ASCOM compatible programs) control external and internal wheels the same way using the same drivers. When the camera is connected over the Ethernet interface, naturally it is possible to control also the external filter wheel through the TCP/IP protocol.

External filter wheel types

External filter wheels are manufactured in several sizes, depending on the camera series and also on the number and size of filters. All external filter wheels has the same 17 mm thickness (the distance between the shell back side and the front plate, to which the telescope adapters are mounted). So the distance from the front plate to detector is 33.5 mm.

Sometimes the thickness of the front side of filter wheel shell is increased from the mechanical reasons and the resulting shell thickness is then 19 mm. But 17 mm distance between the telescope adapter plate and the back shell side remains the same.

The shell diameter depends on the external filter wheel type:

  • “XS” series (for G2 and G3 cameras) wheel diameter is 144 mm.
  • “S” series (for G2 and G3 cameras) wheel diameter is 184 mm.
  • “M” series (for G4 cameras) wheel diameter is 190 mm.
  • “L” series (for G4 cameras) wheel diameter is 226 mm.

Mounting external filter wheels

External filter wheels are attached to the camera head the same way like telescope or lens adapters—using four M3 screws in the corners of a square around the light entrance to the camera head. Distances of the threaded holes depend on the camera type:

  • G2 and G3 cameras use four M3 screws in the corners of the 44 mm square. The single external filter wheels type can be used on both camera models.
  • G3 cameras use four M3 screws in the corners of the 52 mm square.


Remark: although external filter wheels for G2 and G3 cameras are compatible, in reality the different filter size is the limiting factor. CCD detectors up to 24 × 36 mm are used in G3 cameras and any other filters than Ø50 mm (or 2 inches) cover corner parts of the chip. On the other side using such large filters for relatively small detectors, used in G2 cameras, is superfluous and it is more effective to use cheaper Ø36 mm or Ø31 mm filters. What's more, more positions are available for smaller filters.

The external filter wheel housing thickness is always the same regardless of the number of positions, filter size and camera type.

The distance of the filter wheel housing front plate from the detector is 4.5 mm greater than in the case of camera with internal filter wheel. (33.5 mm compared to 29 mm). All available adapters for telescopes and lenses, which require preserving of the back focal distance, are designed to reflect this distance. Adapters keep the defined back focal distance if mounted 33.5 mm from the CCD. When these adapters have to be used on camera with internal filter wheel, it is necessary to use 4.5 mm thick spacer.

Also Off-Axis Guider (OAG) for G2 cameras is designed to preserve 55 mm back focal distance when mounted to external filter wheel housing. It it used on camera with internal filter wheel, spacer supplied with the OAG must be used.

Installation procedure is as follows:

    1. External filter wheel has to be attached directly to the camera head. If there is some camera adapter mounted to the head, it must be removed first.

    2. The filter wheel housing front side must be unscrewed first. The front side is held on place with 8 M3 screws close to the outer edge and one central screw. So 9 screws must be removed in total. If there is an adapter on the external filter wheel housing front side, it is not necessary to remove it.

    3. The filter wheel itself, located inside the housing, can be freely removed after removing of the front side. The wheel is fixed in place by the central screw, going through the front side.

    Warning: the filter wheel position is determined by the optical bar on the wheel side. One sensor of a pair is located above the filter wheel and care must be taken when removing the wheel not to damage this sensor. Wheel must be slightly pulled and then slid. Opposite movement must be applied when mounting the wheel back.

    4. There are four countersunk holes in the wheel housing back shell. The filter wheel is fixed to the camera head using for M3 screws going through these holes.

    Warning: always use the screws supplied with the filter wheel. (M3×6 screw with countersink head). Longer screws may extend inside the camera head and may interfere with the camera shutter.

It is also necessary to connect the filter wheel with the camera head using the supplied short 8-wire cable with RJ45 connectors.

Moravian OAG-L-G4-M68 off axis guider with M68 x 1 thread for G4 Mark II Series CCD cameras

Off-axis guider adapters for G3 and G4 cameras are equipped with M68 × 1 thread on the telescope side in the distance 61.5 mm from the detector. Two variants (for G3 cameras and for G4 cameras) differ in the mounting holes placement and also in the distance of the reflecting mirror from the optical axis.

The mirror used to deflect light to guiding camera has 10 × 7 mm front cross-section (mirror dimensions are 10 × 10 mm, but the mirror is angled at 45 degrees). This is enough for guiding cameras with very large 2/3" format detectors without any significant vignetting (smallest detectors used in G0/G1 guiders is of 1/3" format, but numerous guiding cameras use 1/4" or even smaller chips).