IMX571 ToupTek 2600mm settings and slightly bright bottom edge in darks

Hello Patrice,
I use this camera for 2 years now (also had the color version) 

So I can tell you for my B5/6 skies and objects that are NOT captured with narrowband or have an extremly bright core, Gain 100 with the HCG and offset of 300 is ideal.
I got an F3.6 system so 60 sec is maximum for me.

If you use narrowband however and your telescope is quite slow, you should use a gain of 200 or 300 with the same offset to get rid of readnoise.

The Low conversation Gain is great for fast optics and bright objetcs like M42 PNs. Of course you can do images with only 10 sec in the HCG, but that causes a lot of data, better is that you use the LGC and do 60 sec so you can use the Fullwell and also the max of dynamic range.

Some expamples:

Touptek 2600mp with an F5 Telescope capturing M51:
Recommended Setting under Bortle 5/6: Gain 100 Offsett 300, 120 sec exposure luminance, HCG

Touptek 2600mp with an F5 Telescope capturing M42:
Recommended Setting under Bortle 5/6: Gain 100 Offsett 300, 60sec exposure luminance, LCG

Touptek 2600mp with an F5 Telescope capturing IC 443:
Recommended Setting under Bortle 5/6: Gain 200 Offsett 300, 300sec exposure H-alpha , HCG

You will get a feeling with it. Very important: Exposuretime needs to be set so long, that the readnoise (horiontal banding) is gone. If the tracking is not accurate enough for longer guiding, up the gain up.

Also please dont cool the camera at max capacity. -10 is enogh and the advantage to -20 is very slim but stressed the camera and can cause some dew.

Hi fellows Touptek users, 

I recieved my TS-Optics Touptek 2600mm this morning, together with the filter wheel and the filters. Tonight was dedicated to camera testing. So far so good. 

After initial testing, I opted for a gain value at 100, an offset value at 200, HFW off, Ultra on, HCG. 

This yields
- biases with mean ADU at 202.392 after stacking, minimal value for an individual sub measured at 29. 
- darks (5s at -10°) with mean ADU at 203.438 after stacking. 
- So far I understand, we want precisely to have close values here, with the former being slightly lower than the latter. So far so good. 

I have a small bright band at the bottom of my darks. This is quite impressive with the STF, but one has to realize that the this correspond to an ADU increase from 203 to 212, which is really marginal. 

Here is the 15s master dark, with auto STF : 


Here is a stacked 300s dark, where the measured ADU varies from 203 to 217. 



I am not really worried. First, edges are cropped anyway. Second and most importantly, after more than two years with my 294mc pro, nothing scares you.

I would nonetheless know if you regard this as normal ? 

Thanks & CS

Patrice