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Cooled Photometry Camera - What would you choose?

CMOS EAA Solar Equipment
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#1 GaryShaw

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Posted 17 September 2021 - 01:05 PM

Hi All:

I'm attempting to graduate into more serious Variable star and perhaps Exoplanet work. I am considering the following two cameras so far but I'd really appreciate any insights from the folks in this Forum.

 

1. ASI294 MM Cooled -  https://astronomy-im...roduct/asi294mm

 

2. ASI183 MM Cooled -   https://astronomy-im...i183mm-pro-mono

 

One advantage of the 294 is it's 63k full well depth. Additionally, I have the MC, uncooled, version of this and it's been great.

 

An advantage (I think) of the 183 is the smaller pixels but the well depth is only 15k.

 

I have recently acquired a Chroma, Bessell V filter which has been approved by AAVSO and will be getting a B filter before long. These should allow me to determine the transformation coefficients and, with a bit more practice, I will be able to submit more accurate data.

 

I'd really welcome any thoughts from you on the relative benefits of these two cameras - plus any other camera options you feel I should know about. Also, any thoughts on the suitability for these cameras for other potential future uses, eg, Spectroscopy, Solar, NEO, etc. 

 

Thank you!

Gary


Edited by GaryShaw, 17 September 2021 - 01:07 PM.


#2 robin_astro

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Posted 17 September 2021 - 06:28 PM

 

I have recently acquired a Chroma, Bessell V filter which has been approved by AAVSO 

That's interesting. The published passband shape of the Chroma filters shows sharp cutoffs so quite different from Bessell. Are there any published details of the approval process ?

 

Thanks

Robin



#3 gregj888

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Posted 18 September 2021 - 12:04 AM

Gary, have you thought about a QHY-268m?   

 

16 bit, 51 Ke well....

 

Greg



#4 GaryShaw

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Posted 18 September 2021 - 10:15 AM

Thank you Greg. It looks great so on the list it goes….probably at #3 position due to the $2200 pricing.

Gary


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#5 wizer

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Posted 20 September 2021 - 08:39 PM


An advantage (I think) of the 183 is the smaller pixels but the well depth is only 15k.

Note that the 294mm can be used in Bin1 with a pixel of 2.315 yet this lowers well depth to 14k and 12bit ADC (instead of 14bit).



#6 Ed Wiley

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Posted 21 September 2021 - 10:33 PM

My advice is to get a camera without amp glow if you can. Amp glow signal complicates calibration and precludes the use of bias frames to scale darks. You can properly calibrate a CMOS mono that has amp glow but avoiding amp glow makes calibration easier. Of course 16bit is desirable, but you can do good photometry with a 12bit camera.

 

Ed


Edited by Ed Wiley, 21 September 2021 - 10:37 PM.



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