Nikon star eater

Wouldn't it be cool if we could make our camera do ________ ?
Patching issues and other general help requests here please.

Nikon star eater

Postby D80 » Mon Apr 09, 2012 4:36 am

Hello

This is a request that gains Astrophotagrapher (like me), there is a software median filter that removes hot pixels automaticly and it destroys low light sections in the picture. There is lot of information about this on the web.

Here is a good comparison with a Nikon D70 and a Canon 10D
http://www.astrosurf.com/buil/d70v10d/eval.htm

I have a D80 and its affected to.
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Re: Nikon star eater

Postby D80 » Sat Apr 21, 2012 4:33 am

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Re: Nikon star eater

Postby astronomer » Sun Apr 29, 2012 8:19 am

Yes, this feature should be absolutely essential for astrophotographer.
Another reference of this issue can be seen by doing FFT on dark frame and measurement of standard deviation of pixels. D7000 also activates this mode when exposure drop to 1/4 and below.
http://home.comcast.net/~NikonD70/GeneralTopics/Sensors_&_Raw/D90_Does_Noise_Reduction_on_NEFs_at_Longer_Exposures.htm
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Re: Nikon star eater

Postby D80 » Wed May 02, 2012 1:20 am

Thanks for that link, I havn't seen that before. I hope someone with some programming skills can fix this issue, I'm still stuck with "hello world" programming :)
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Re: Nikon star eater

Postby tamas970 » Mon May 07, 2012 1:27 am

I added the request to the official D5100/D7000 feature request topic, I really hope it goes through, I don't want to switch to canon...
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Re: Nikon star eater

Postby D80 » Tue May 08, 2012 11:57 pm

Very good, but it would be better if the stareater would be fixed on the Nikon CCD cameras for exampel D40, D50, D70, D80. That sensor is more light sensitive then later CMOS sensors. I'dont want to switch to Canon either... However, if it would be fixed on any Nikon kamera I and many other people would be very satisfied.
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Re: Nikon star eater

Postby tamas970 » Wed May 09, 2012 3:36 am

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Re: Nikon star eater

Postby astronomer » Fri May 11, 2012 10:46 am

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Re: Nikon star eater

Postby D80 » Wed May 16, 2012 10:56 pm

Hello

Are you sure about the quantum effinency? If I google on the sensor that D80 contains I found this camera
http://www.opticstar.com/Run/Astronomy/ ... _10_0_6_11
In the specification I can read it has 55% QE, it should be the same in the D80 especally in mode 3?

But according to this link, you have absolutly right
http://sensorgen.info/
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Re: Nikon star eater

Postby astronomer » Fri May 18, 2012 8:55 pm

Yeah the 55% is the peak QE. I guess it should be around 60% actually from other source. See qhyccd.com, the 6MP and 10MP sony CCD has similar QE, but no one has tested them under spectroscope.

The value from sensorgen is deduced from 18% SNR in dxomark. It is the quantum efficiency of the whole channel instead of monochromatic light.
And the value in sensorgen is relative instead of absolute.
There are many aspects affecting QE, as the area underneath the QE curve increase even with the peak remained the same, the sensor will still have a much higher 18% value.
But recent report on IMX-035 has shown a much improved QE curve compared to previous generation CCDs!
http://www.ptgrey.com/support/downloads ... on_FAQ.pdf
And this is not a back illuminated one!
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