Moravian Instruments G3-1000 User Manual Download Page 30 | Manualshive

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Illustration 17: G3-OAG on the camera head

Attaching camera head to telescope mount

G3 cameras are equipped with two “tripod” 0.250-20UNC threads on the top
side of the camera head. This thread can be used to attach 1.75 inch “dovetail
bar” (Vixen standard). It is then possible to attach the camera head, e.g.
equipped with photographic lens, directly to various telescope mounts
supporting this standard.

Illustration 18: 1.75" bar for standard telescope mounts

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Summary of Contents for G3-1000

Page 1: ...G3 CCD Camera User s Guide ...

Page 2: ...ized for and should not be used within Life Support Systems without the specific written consent of the Moravian Instruments Product warranty is limited to repair or replacement of defective components and does not cover injury or property or other consequential damages Copyright 2000 2018 Moravian Instruments Moravian Instruments Masarykova 1148 763 02 Zlín Czech Republic tel fax 420 577 107 171 ...

Page 3: ... 6300 15 Model G3 11000 15 Model G3 16200 16 Cooling and power supply 17 Power Supply 18 Mechanical Specifications 20 Camera head dimensions 21 Telescope adapters 27 Off Axis Guider Adapter OAG 29 Attaching camera head to telescope mount 30 Camera head color variants 31 Camera Maintenance 32 Desiccant exchange 32 Changing the silica gel 33 Changing Filters 35 Changing the Whole Filter Wheel 37 Cha...

Page 4: ...mera G3 camera mus be made without internal filter wheel to be compatible with external filter wheels The G3 cameras are designed to work in cooperation with a host Personal Computer PC As opposite to digital still cameras which are operated independently on the computer the scientific slow scan cooled cameras usually require computer for operation control image download processing and storage etc...

Page 5: ...e for direct connection to the host PC Because the PC then uses TCP IP protocol to communicate with the cameras it is possible to insert e g WiFi bridge or other networking device to the communication path The G3 cameras need an external power supply to operate It is not possible to run the camera from the power lines provided by the USB cable which is common for webcams or very simple imagers G3 ...

Page 6: ...l reuses the control electronics which stays idle if the camera is not equipped with internal filter wheel This solution eliminates separate power and control cables for the external filter wheel as it is attached to the camera head It also brings full software compatibility as the software does not distinguishes internal and external filter wheels only the number of available filters is different...

Page 7: ...Illustration 1 Schematic diagram of the G3 camera system components 7 ...

Page 8: ...pter ARM CPU Camera Ethernet Adapter allows connection of up to 4 Gx cameras of any type on the one side and 1 Gbps Ethernet on the other side This adapter allows access to connected Gx cameras using routable TCP IP protocol over practically unlimited distance 12 5 positions internal filter wheel for 2 D50 mm filters 13 7 positions external filter wheel S for 2 D50 mm filters 14 9 positions extern...

Page 9: ...ts blooming of the charge to neighboring pixels when image is over exposed to ensure linear response to light FF CCD detectors used for astrophotography are equipped with ABG to eliminate disrupting blooming streaks within field of view Cameras with Full Frame detectors are suitable for scientific applications where linear response is necessary for photometric applications in astronomy microscopy ...

Page 10: ...m is also known as electronic shuttering because it allows very short exposures and also digitization of the image without mechanically shielding of the detector from incoming light Also cameras with IT CCDs are equipped with mechanical shutter because electronic shutter does not allow dark frame exposures necessary for proper image calibration etc The price for electronic shutter if lower quantum...

Page 11: ...7 2 21 8 mm ABG No No Yes Yes Color mask No No No Yes G3 camera models with IT CCD architecture Model G3 11000 G3 11000C CCD chip KAI 11002 KAI 11002 Resolution 4032 2688 4032 2688 Pixel size 9 9 μm 9 9 μm CCD area 36 3 24 2 mm 36 3 24 2 mm ABG Yes Yes Color mask No Yes Cameras with C suffix contains CCD detector covered with so called Bayer mask Color filters of three basic colors red green blue ...

Page 12: ...xel which of course limits resolution of color image Imaging using color detectors is described in the Color images chapter CCD Chip Quantum efficiency sensitivity of CCD detectors used in G3 cameras depends on the particular camera model Illustration 4 Quantum efficiency of CCD detectors used in G3 Inherent dark current of these detectors is quite low compared to other CCD detectors suitable for ...

Page 13: ... μm Imaging area 27 7 18 4 mm Full well capacity Approx 100 000 e Output node capacity Approx 220 000 e Dark current 1 e s pixel at 0 C Dark signal doubling 6 3 C Model G3 11000 G3 11000 uses 11 MPx CCD OnSemi KAI 11002 Class 1 or 2 Resolution 4032 2688 pixels Pixel size 9 9 μm Imaging area 36 3 24 2 mm Full well capacity Approx 60 000 e Dark current 12 e s pixel at 0 C Dark signal doubling 7 C AB...

Page 14: ...t USB interface ensures image download time within seconds Maximum length of single USB cable is 5 m This length can be extended to 10 m by using single USB hub or active USB extender cable Up to 5 hubs or active extenders can be used in one connection Gx Camera Ethernet Adapter device allows connection of up to four Gx cameras of any type through Ethernet interface and TCP IP network Because TCP ...

Page 15: ...in 3 e ADU 1 1 binning 5 e ADU other binnings System read noise 12 e Low noise 15 e Preview Full frame download 1 6 s Low noise 1 3 s Preview Model G3 6300 Gain 1 5 e ADU 1 1 binning 2 3 e ADU other binnings System read noise 10 e Low noise 12 e Preview Full frame download 9 4 s Low noise 7 3 s Preview Model G3 11000 Gain 0 8 e ADU 1 1 binning 1 6 e ADU other binnings System read noise 11 5 e Low ...

Page 16: ...Model G3 16200 Gain 0 6 e ADU 1 1 binning 1 0 e ADU other binnings System read noise 10 e Low noise 11 e Preview Full frame download 24 5 s Low noise 18 8 s Preview 16 ...

Page 17: ...mperature Compared to standard variant enhanced cooling cameras are somewhat bulkier due to bigger heat sink slightly heavier and somewhat noisier because of more powerful fans The camera head contains two temperature sensors the first sensor measures directly the temperature of the CCD chip The second one measures the temperature of the air cooling the Peltier hot side The cooling performance dep...

Page 18: ...tandard left and enhanced right cooling cameras Power Supply The 12 V DC power supply enables camera operation from arbitrary power source including batteries wall adapters etc Universal 100 240 V AC 50 60 Hz 60 W brick adapter is supplied with the camera Although the camera power consumption does not exceed 55 W the 60 W power supply ensures noise free operation Camera head supply 12 V DC Camera ...

Page 19: ...cy can degrade if the supply drops below 12 V 3 G3 camera measures its input voltage and provides it to the control software Input voltage is displayed in the Cooling tab of the Imaging Camera control tool in the SIPS This feature is important especially if you power the camera from batteries Illustration 6 12 V DC 5 A power supply adapter for G3 and G4 CCD Camera Warning The power connector on th...

Page 20: ... inch filter cells with M48 0 75 thread There are three M3 threaded holes around each filter position which allow fixing of filters without cells only a glass up to 51 mm diameter Mechanical shutter Yes blade shutter Shortest exposure time 0 2 s Longest exposure time Limited by chip saturation only Internal filter wheel optional 5 positions 2 threaded filter cells or glass filters up to 51 mm diam...

Page 21: ...d weight 1 8 kg G3 EC without filter wheel 2 1 kg G3 EC with internal filter wheel 2 7 kg G3 EC with S external filter wheel Camera head dimensions Illustration 7 G3 camera front view both standard and enhanced cooling 21 ...

Page 22: ...Illustration 8 G3 camera with standard cooling and internal filter wheel side view Illustration 9 G3 camera with standard cooling and internal filter wheel bottom view 22 ...

Page 23: ...Illustration 10 G3 camera with enhanced cooling and internal filter wheel side view Illustration 11 G3 camera with enhanced cooling and internal filter wheel bottom view 23 ...

Page 24: ...Illustration 12 G3 camera front view both standard and enhanced cooling with S size external filter wheel 24 ...

Page 25: ...Illustration 13 G3 camera with standard cooling and S size external filter wheel side view Illustration 14 G3 camera with standard cooling and S size external filter wheel bottom view 25 ...

Page 26: ...Illustration 15 G3 camera with enhanced cooling and S size external filter wheel side view Illustration 16 G3 camera with enhanced cooling and S size external filter wheel bottom view 26 ...

Page 27: ...pters 2 barrel adapter Adapter for 2 focusers T thread short M42 0 75 mm inner thread 7 5 mm thick T thread with 55 mm BFD M42 0 75 mm inner thread preserves 55 mm back focal distance M48 0 75 thread short Adapter with inner thread M48 0 75 7 5mm thick M48 0 75 thread with 55 mm BFD Adapter with inner thread M48 0 75 preserves 55 mm back focal distance Pentax Praktica lens adapter M42 1 mm inner t...

Page 28: ...nsert clip filter Can be used on cameras with internal filter wheel only Nikon F lens adapter Standard Nikon F bayonet adapter 3 Wynne adapter Adapter for 3 coma corrector ASA Wynne 3 Paracorr BIG adapter Adapter for 3 coma corrector TeleVue Paracorr BIG intended for G3 OAG 3 Paracorr BIG adapter Adapter for 3 coma corrector TeleVue Paracorr BIG intended for attaching to EFW with M68 1 28 ...

Page 29: ...ter contains flat mirror tilted by 45 to the optical axis This mirror reflects part of the incoming light into guider camera port The mirror is located far enough from the optical axis not to block light coming to the main camera sensor so the optics must be capable to create large enough field of view to illuminate the tilted mirror Because of the above described reasons the G3 OAG is manufacture...

Page 30: ...250 20UNC threads on the top side of the camera head This thread can be used to attach 1 75 inch dovetail bar Vixen standard It is then possible to attach the camera head e g equipped with photographic lens directly to various telescope mounts supporting this standard Illustration 18 1 75 bar for standard telescope mounts 30 ...

Page 31: ...Camera head color variants Camera head is available in several color variants of the center plate Visit manufacturer s web pages for current offering Illustration 19 G3 camera color variants 31 ...

Page 32: ...y a cylindrical container filled with silica gel desiccant is placed inside the camera head This cylindrical chamber is attached to the insulated cooled CCD chamber itself Warning High level of moisture in the CCD chip chamber can cause camera malfunction or even damage to the CCD chip Even if the frost does not create on the detector when the CCD is cooled below freezing point the moisture can be...

Page 33: ... accessible from the camera back side Changing the silica gel The desiccant container design depends on the camera revision G3 cameras revision 1 have the container accessible from the back side of the camera head The slotted desiccant chamber cap can be unscrewed e g by a coin Pour out wet silica gel and fill the chamber with a dry one The desiccant chamber can be filled with a hot silica gel wit...

Page 34: ...r itself does not contain any sealing the sealing remains attached to the CCD cold chamber inside the camera head it consists of aluminum parts only So it is possible to heat the whole container to desired temperature without risking of the temperature induced sealing damage This design also allows usage of some optional parts First it is a threaded hermetic cap which allows sealing of the dried c...

Page 35: ...ole filter wheel of the G3 camera Opening the head is quite simple it is just necessary to unscrew she eight bolts which holds the camera head together Warning The blade shutter rotates 180 between individual snapshots Camera cover could be opened only when the shutter is closed If for instance the camera is unplugged from power adapter while exposing and the shutter remains open it can be damaged...

Page 36: ... front part of the case Notice there are two cables connecting the filter wheel motor and the filter position optical bar plugged into the electronics board It is not necessary to unplug these cables to change filters but if you unplug them take care to connect them again in the proper orientation Filter numbering is always engraved into the wheel as illustrated on the image below 36 ...

Page 37: ...anging filters The filter wheel can be removed when you unscrew the bolt on the center of the front part of camera case Take care not to damage the horseshoe shaped optical bar when replacing the filter wheel Changing the Telescope Adapter The camera head contains bolt square The telescope adapter is attached by four bolts If you want to change the adapter simply unscrew these bolts and replace th...

Page 38: ...f inverted polarity power plug or against connecting of too high DC voltage above 15 V by a fuse If such event happens and the cooling fans on the back side of the camera do not work when the camera is connected to proper power supply return the camera to the service center for repair 38 ...

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