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Old CCD vs newer Nikon DSLR

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#1 drew2578

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Posted 23 May 2020 - 01:11 AM

What do you guys think of a QHY12 vs a Nikon D5500?

 

Nothing more that 5 minute subs.

 

On paper the I think the Nikon has better QE at 58% I think.

 

Thoughts?


Edited by drew2578, 23 May 2020 - 01:21 AM.


#2 rockstarbill

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Posted 23 May 2020 - 01:20 AM

The QHY has cooling and has no filter blocking HA signal. Game over.

 

CCD cameras are not bad.


Edited by rockstarbill, 23 May 2020 - 01:22 AM.

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#3 drew2578

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Posted 23 May 2020 - 01:23 AM

Forgot to say D5500 will have no filter either.



#4 rockstarbill

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Posted 23 May 2020 - 01:25 AM

Forgot to say D5500 will have no filter either.

Still doesnt have cooling, so the QHY12 wins. No uncooled DSLR camera is going to win in a contest against a cooled CCD camera. Dark current will be its undoing.


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#5 sharkmelley

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Posted 23 May 2020 - 01:30 AM

The Nikon D5500 has its own internal power source (a battery), its own internal storage (a memory card) and its own preview mechanism (a rear screen).  It also has a built-in tripod mounting thread.  This makes it ideal for travelling to remote locations.

 

The QHY12 has none of those advantages and is more suited for a permanent set-up.

 

Mark


Edited by sharkmelley, 23 May 2020 - 01:31 AM.


#6 drew2578

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Posted 23 May 2020 - 01:30 AM

Even with over a 20% QE difference and noise substraction?



#7 rockstarbill

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Posted 23 May 2020 - 01:34 AM

Even with over a 20% QE difference and noise substraction?

Mark offered some non-IQ related benefits, but if you are talking camera vs camera straight up in terms of IQ (which is what I thought you were asking) - the QHY12. If you want to use it as mentioned above, then the QHY would not be as well suited to that. You could make it more travel friendly, but out of the box it would not be.


Edited by rockstarbill, 23 May 2020 - 01:41 AM.


#8 ccs_hello

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Posted 23 May 2020 - 09:55 AM

To muddy the picture a bit...

most of the image sensors used in astroCCD imager or astroCMOS imagers are not special made simply because of the economy of scale (classic Kodak is one of the exceptions.)

They are typically sourced from image sensors designated for DSLR/mirrorless cameras.

E.g., ICX613 is rumored to be the ones used in Alpha 350/380 (ca. 2009).  

BTW, Nikon D5500 was introduced in 2015.

 

Now the original question can be broken down into two-and-half parts:

1. what special "magic sauce" has been used to make (dedicated/special purpose) astroimager better

2. what image sensor technologies have improved over the years to make the newer image sensor better

2.5 CMOS image sensor vs CCD image sensor 

 

All of them had been discussed in this forum.

The interesting part is to combine all these factors into a singular formula and expect to get an absolute answer...




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