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Old 22-05-2018, 10:01 PM
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that_guy (Tony)
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Qhy9 percent gain to true gain

Not sure the correct terms to use but i short I'm looking for a non-percentage value for the gain. Currently qhy displays the gain as a percentage value but i need a whole number value to use in sgp to calculate the ideal exposure time.

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Tony
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Old 27-05-2018, 10:03 PM
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alpal
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Quote:
Originally Posted by that_guy View Post
Not sure the correct terms to use but i short I'm looking for a non-percentage value for the gain. Currently qhy displays the gain as a percentage value but i need a whole number value to use in sgp to calculate the ideal exposure time.

Thanks
Tony

It depends on each camera as they are all different.
see here:
http://www.astropixel.gr/uploads/7/8...and_offset.pdf


or if you're lazy like me & most people
just use gain of 3% and offset of 115.
That should mean that you won't peak out the top at:
2 to the power of 16 = 65536.


If you come close at 50,000 to 60,000 it will be OK.
You can check it with Maxim DL on bright saturated stars.
What value do they read?
PS - make sure you use only slow readout.



cheers
Allan
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Old 28-05-2018, 08:44 AM
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multiweb (Marc)
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I use gain 1 offset 113 for mine.
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