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Exposure times


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What difference is there in exposure times between a CCD cam and a CMOS cam?

I use 300s + on my CCD but seen CMOS exposures of .8 sec (x 1000),

are they so different?

 

Cheers

Ron

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Yes Ron they can be a lot different.

But and here comes the but , they appear more noisy and you therefore collect loads and loads of them, which uses a lot of drive space and takes longer to stack.

 

Swings and roundabouts.

CMOS are geting better but IMO have not caught the CCD as yet.

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Derbyshire Dave

I think in general,  you're always better to go for the later technology. There are often several different levels of improvements at the same time. One issue with CMOS cameras is amp glow, where you get a regular pattern caused by current flowing in the substrate.

I was really worried when I first saw the amp glow on mine, but the same amp glow appears on the darks, and so using darks in DSS just simply removes it on one shot.

 

Very pleased with my CMOS ZWO ASI 183LMM Pro cooled camera.

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In terms of exposure length to get the same result, I would have thought that is dependent upon the sensors quantum efficiency.  They both convert photons to electrons, but I think CCDs still do it slightly better. 

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Posted (edited)

I cannot afford a Pro cooled CMOS, that's the problem!! 

Looking at the ZWO ASI 385MC which seems to be about my limit but looks to give pretty good results!

 

Ron

Edited by RonC
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Posted (edited)

I've got no patience Steve and I'm still saving for a caravan!!

I am getting emails from AB&S though!

Ron

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