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Camera Choice Trius SX-42 Mono CCD or new ZWO ASI2600MM Pro Mono

astrophotography accessories ccd CMOS imaging
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#1 nashuaslick

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Posted 16 January 2021 - 12:58 PM

Hello,

 

I am setting up a new astroimaging rig.   I have ordered the Skywatcher Esprit 120ED 20th Anniversary kit which comes with the Trius SX-42 Pro.  It is supposed to be a great camera, but is also older technology. It also comes as a kit with filter wheel, lodestar x2 and adaptors that are setup for plug and play measurements.

 

Now the specs of the ZWO ASI2600MM Pro Mono look much better, but it is a CMOS camera.  My head is swimming between the two.  I don't know which specs are more important, but the new ZWO has zero amp glow, which was one of the major limiting factors of the CMOS's in the past.

 

Should I go with the CCD with some lower specs or has this CMOS finally surpassed it?  (Specs Below)

 

Thank you for any feedback!

Scott LaClair

 

 

Trius SX-42 Mono Specs:

Medium Format

Low Temp Cooling Systems
The TRIUS Pro Camera Series reach anywhere between -40 and -50 degrees of cooling, ensuring that your noise levels stay extremely low. Combined with this, each camera is designed with Argon-filled sensor chambers to further optimize this process.

ADC16 bit
Color or MonoMonochrome
Cooled Cooled
Delta T45C
Dynamic Range 12 Stops
Full Well 17ke
Mega Pixels 6.1 mp
Peak QE77%
Pixel Array 2750 x 2200
Pixel Size 4.54 microns
Read Noise 3e
Sensor Diagonal 16mm
Sensor Type CCD
Sensor Sony ICX694
Weight 1 lbs

 

The ZWO ASI2600MM-P Specs:

2/3 APS-C Format

Sensor: SONY IMX571 CMOS
Diagonal: 28.3mm
Image area: 23.5*17.5mm
Resolution: 26 Mega Pixel 6248*4176
Pixel Size: 3.76μm
Shutter: Rolling shutter
Exposure Range: 32μs-2000s
ROI: Supported
Read Noise: 1.0-3.3e
QE peak: 91%
Full well: 50000e
ADC:16bit
DDRIII Buffer: 256MB
Non-volatile memory/On camera storage: Build-in total 192K byte user-accessible space(image size up to 480X320)
Interface: USB3.0/USB2.0
Interface: USB3.0/USB2.0
Adaptor: M42X0.75
Protect window: D60-2 AR
Dimensions: 90mm Diameter
Weight: 700g
Back Focus Distance: 17.5mm
Cooling: Regulated Two-Stage TEC
Delta T: 35°C below ambient
Camera Power consumption: 1.15A at 5V
Cooler Power consumption: 12V at 3A Max
Working Temperature: -5°C—50°C
Storage Temperature: -10°C—60°C
Working Relative Humidity: 0%—80%
Max FPS at full resolution:
16Bit ADC
6248×4176 3.51fps
4096×3072 4.75fps
4096×2160 6.71fps
3840×2160 6.71fps
1920×1080 13.13fps
1280×720 19.29fps
640×480 28.06fps
320×240 51.44fps


Edited by nashuaslick, 16 January 2021 - 02:08 PM.


#2 bobzeq25

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Posted 16 January 2021 - 03:04 PM

Easy question to answer.

 

I have a 694 chipped CCD, and like it very much.  Lovely, low noise data, a joy to process.  If you're going to be getting it anyway, I'd use it for now.  I, and many others, have made excellent images with it.

 

But, if I had no camera, and was choosing between buying the SX42 or the 2600, I'd go with the 2600.  It would not be a close call.  <smile>  I see a number of scopes advertised as package deals with the SX42, they must be clearing out unsold cameras.  Costs more than a 2600, is not as good.  They've made progress in 7 years.  <smile>

 

Minor point for others reading this.  Amp glow is not a big deal.  You calibrate your frames properly (don't double subtract bias, don't "optimize" darks, take no shortcuts, don't use DSS) and it goes away.


Edited by bobzeq25, 16 January 2021 - 03:16 PM.

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#3 Stelios

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Posted 16 January 2021 - 04:05 PM

The 2600. Larger full well, much lower read noise, larger sensor, extras (onboard usb hub, built-in dew control). Only "downside" is slightly smaller pixels which may matter if you have a long F/L scope--but if you have a long F/L scope, you'll appreciate the larger sensor size of the 2600. 

 

Not close, not even at the same price. 


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#4 Stelios

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Posted 16 January 2021 - 04:07 PM

The 2600. Larger full well, much lower read noise, larger sensor, extras (onboard usb hub, built-in dew control). Only "downside" is slightly smaller pixels which may matter if you have a long F/L scope--but if you have a long F/L scope, you'll appreciate the larger sensor size of the 2600. 

 

Not close, not even at the same price. 

One caveat--if your scope has a very small image circle, then you may not be able to utilize the APS-C sensor of the 2600. This would reduce its advantage over the Trius. 


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#5 nashuaslick

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Posted 16 January 2021 - 09:10 PM

Thank you very much. The trius is on backorder, so I can still cancel it.  I will be buying the 2600.  Thank you all for the feedback!


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#6 nashuaslick

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Posted 16 January 2021 - 10:29 PM

One caveat--if your scope has a very small image circle, then you may not be able to utilize the APS-C sensor of the 2600. This would reduce its advantage over the Trius. 

It has a 43mm Image circle and 840mm FL will this work well ?



#7 bobzeq25

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Posted 16 January 2021 - 10:33 PM

It has a 43mm Image circle and 840mm FL will this work well ?

It will work fine.

 

This issue generally doesn't arise with APS-C sensors, if the image train is set up properly.

 

Full frame is another story.  <smile>


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