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So I got this new mono guide camera and am having a hard time working out the gain settings. In the documentation on the Touptek site it shows the gain graph and that example goes up to 5000 gain from 100, yet in the ASCOM and native driver it just goes from 0 to 100, and had a Low and High gain mode. so what settings should I be using on the scale of 0-100 ?? I see on the graph that High gain mode and gain of 100 gives, what looks like unity gain, but how does that correlate to the setting in the driver which only go to 100 ? below re the graphs for both Low and high gain modes with Sharpcap sensor analysis am totally confused by this, does anyone use this camera or other Touptek camera and can explain to me how it all works.. thanks in advance Low gain mode  High gain mode  |
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I believe the ASCOM gain is expressed in percentage, 0-100% of whatever the range is in the software. In this case touptek gain of 5000 corresponds to 100% ascom, similarly 2500 -> 50% and 50 -> 1%. If the camera does not have a UV/IR filter as its glass plate then you might need one to use it for guiding. I have a touptek guide camera based on IMX290 mono and must use the filter to reduce star bloat. I try to use the lowest gain setting and typically don't have any issue using 0 gain, which I assume is unity gain because touptek's documentation doesn't describe it. I also have to set the adu saturation value manually in phd2 to 4095 and connect in 16 bit mode as the touptek driver does not scale the camera's 12 bit output to a 16 bit, or even 8bit. |
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I use the GPM462 Exacly like Himanshu Pandey. No issues from 0 - 100%. Sometimes 0% is to low, 33% allway works god for me (with 120/30mm guidescope) and set in phd2 to 4095 and 16bit. I saved different profiles for 0, 33 and 100% with darks taken with the different gains.
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Stephan May: In the ASCOM driver I only have the options of 12 bit and 8 bit, and a max value of 255 in the ADU setting, so do you use the native driver or the ASCOM ? |
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Ah, ok I have swapped to the native driver and I now see the settings you both mention, thanks 👍🏻
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Since you are using this as a guide camera I wouldn't obsess about the settings. I would try zero gain first and see how that guides. If PHD2 is having trouble finding guide stars you can start edging it up. Just run it at the lowest gain you can for good guiding results. A UV/IR filter is a good idea or even better, a 25A red or IR pass filter. You may have to increase the gain a bit more but it will greatly calm star movement which will calm your guiding as well.
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Tony Gondola: I did not know about the red or IR pass filter. Thank you! I have a red filter from an eyepiece kit that I'm eager to try. |
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Tony Gondola: Yes, this is why I bought the camera, to use IR guiding, I have an 850nm IR pass filter from ZWO to use with it. Thanks |
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Do you recommend using IR filter on the guiding scope or between the camera and the scope?
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Do you recommend using IR filter on the guiding scope or between the camera and the scope? On the guide scope, that is the whole point of IR guiding, if you put it on the imaging scope it will not help the guiding at all, no probably ruin the image. And it’s an IR pass filter, not an IR block filter. HTH 👍🏻 |
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AstroShed: My apologies. I meant the IR Pass filter on the guiding scope. Since I have never used it before, I am not sure if I need to mount it between the guiding camera and guiding scope or directly on the guiding scope in front of the lens. |
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AstroShed: On the end of the guide camera, not on the end of the guide scope, 👍🏻 |
