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91
TAC Imaging / Re: Lunar imaging question
« Last post by John Pierce on April 26, 2017, 03:18:47 PM »
I'd just adjust one factor, the gain, at least until you run into some sort of limitation....   lowering gain shouldn't increase noise, which is your biggest enemy.
92
TAC Imaging / Re: Lunar imaging question
« Last post by Davids on April 26, 2017, 03:14:37 PM »
Oops, got to stop using alternative math.  I wasn't far off your exposure time then.  I guess I'll just have to play with gain versus exposure some more.  I could try a neutral density filter also, I have one that I use for visual observing, maybe that will help.

Dave
93
TAC Imaging / Re: Lunar imaging question
« Last post by John Pierce on April 26, 2017, 03:08:49 PM »
1/200th is 5 milliseconds (1/200 = 0.005)

of course, I have no idea how to correlate your "gain" setting to ISO.
94
TAC Imaging / Re: Lunar imaging question
« Last post by Davids on April 26, 2017, 03:03:24 PM »
I'm using Firecapture for camera control and it only gives me a gain control number from 1 to 100 and exposure times in milliseconds.  Based on your recommendation of 1/200th, that works out to an exposure of 300 milliseconds.

The shot I posted was done with a gain of 38 (38%) and exposure time of 4.125 milli seconds.  So it looks like to duplicate what you are talking about, I should drop the gain to about 4 and increase the exposure time to about 300 mSec.

I'll give that a try.  I'm glad I didn't wait to get this camera...the learning curve has been a bit steep for me.

Cheers,

Dave
95
TAC Imaging / Re: Lunar imaging question
« Last post by John Pierce on April 26, 2017, 02:40:12 PM »
using a regular (DSLR) camera, I've based my lunar exposures on daylight. good old 'sunny 16' rule,   shutter speed == ISO at f/16.    f/10 (your C8) is about 1 stop faster than f/11, so if you're using ISO 100 equivalent, then try 1/200th.
96
TAC Imaging / Lunar imaging question
« Last post by Davids on April 26, 2017, 02:22:39 PM »
Hi All,

I picked up an ASI130MM camera recently to use for the eclipse in August.  I figured I might as well practice on the moon also.  My question regards exposure time vs. gain and how to avoid washing out the brightest features.  I got this shot that turned out ok, but Copernicus and Aristarchus are over exposed and the other images I have during the same session that aren't just don't have the same detail (I know it could be seeing). 

I'm using a C8 (note to self, get a Crayford focuser), AutoStakkert for Stacking, and Registax 6 for wavelet processing.

Any suggestions are very welcome.

Cheers,

Dave
97
NGC/IC Project / Corrected NGC v0 online
« Last post by John Pierce on April 26, 2017, 12:56:03 PM »
I've crudely organized the raw NGC html files I got from Akarsh in folders per 100, and put them up here, http://www.ngcicproject.org/NGC/  so at least there's SOMETHING here.

So who has the IC data?
98
NGC/IC Project / Re: NGC/IC Project
« Last post by Mark on April 25, 2017, 05:13:59 PM »

If we can get the help here, it would be much preferred for sure....
99
NGC/IC Project / Re: NGC/IC Project
« Last post by John Pierce on April 25, 2017, 04:24:19 PM »
I'd prefer the people with server access all be locals known to us long timers, vs who knows who from cloudy nights.
100
NGC/IC Project / Re: NGC/IC Project
« Last post by Mark on April 25, 2017, 03:13:16 PM »
I suggest we cast a wider net for talent than exist here.  How about finding the thread on Cloudy Nights where NGC/IC has been being discussed, and ask there saying we have a home and a start on it already?

Mark
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