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Old 23-03-2010, 01:12 AM
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JD2439975 (Justin)
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Originally Posted by kinetic View Post
Does the type of alcohol used affect the outcome BTW?
Steve, not so much the type as quantity used.
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  #22  
Old 24-03-2010, 10:25 AM
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wasyoungonce (Brendan)
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Originally Posted by JD2439975 View Post
Don't know the details but these things look like 240v to 7.4v that the camera battery plug unit plugs into.
Is there a 12v to 7.4v transformer available? if not commercial then DIY, I'm trying to get the whole scope both 240/12v friendly.

Have a read here.

12VDC to 8.1VDC converter to power Canon DSLRs. Of course you can make/mod all this to suit any camera.
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Old 02-07-2010, 05:17 AM
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Excellent! Don't know how I missed this first time around! Respect for the dedication and time taken to put it all together, and in such an easy to visualise format.

Question. It's pretty clear to me about the comparison at a certain temperature of ISO to noise. I'm wondering about signal to noise ratio. How do you use the information you've provided here and somehow add signal data to get a signal to noise ratio type chart. Really, isn't that what we're after?
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Old 02-07-2010, 09:40 AM
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mswhin63 (Malcolm)
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I remember seeing this before but I did not have a DSLR at the time, so I forgot it. This is an excellent reference and would be good information to put in the resources link.
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Old 02-07-2010, 11:02 AM
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troypiggo (Troy)
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I've been thinking about my question above, and may have solved my own problem. If you have a master dark and know the signal value of that, I guess you could just subtract that signal from a light frame of your target and that would give you signal to noise proportions.
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Old 02-07-2010, 01:42 PM
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JD2439975 (Justin)
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Haven't got as far as adding signal Troy, was just interested in noise levels.
In Barry's thread I was just adding an arbitrary amount to derive a SNR as example, nothing very scientific.

Glad you could get something from it guys, makes the effort worthwhile.
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