It's a reflection from your camera window that's going back up into the optical path and coming back down to record on the chip. It happens when the sky background is not perfectly dark. Sky light is

Model running tonight, and what do you know... that halo IS there on this system as well. Since its not Astro Dark, I bet it goes away later as I did not see it previously but it was well into Astro

Yeah I took it all apart when I put the DK out. Next time I have the GTX up I will investigate further. It will probably disappear, whatever it was.

Should also show up in your flat field image. Roland

Very little changes needed with the field flattener. I did have this strange halo appear in my frames that I can only reproduce with the flattener. The Quad TCC doesnt show it, and my DK doesnt show

I'm thinking Field Flattener which gives more leeway for any tilt, and has higher resolution. Although resolution is probably not an issue with those tiny pixels. Rolando

There is a heater you can turn on in the ZWO driver to prevent dew.

Nailing down the spacing gets difficult as well, since the tilt is present. Solving the tilt is a challenge when the spacing is not deadly accurate. So you end up in this vicious cycle. I decided to

Hi Roland and Howard, I stopped imaging cause clouds went in. Then I slewed around in differen ways. From CW up to CCW down on the other side of the meridian and also from CWup on one side to CW up n

I'm working out the QHY600 + 7x50mm filter wheel on my 130GTX+QTCC right now. Long story short, the focal ratio made traditional tilt correction impossible to do and so I'm awaiting delivery of a CTU

APCC can be set up to work this way already. The other issues are new to the CP5 Mach2 and will be dealt with in new firmware that I am testing over the next couple of days. Rolando

Hi Roland, >>The CP5 has a built-in encoder limit which turns the mount off and parks it >>when the scope tracks approximately 1 minute past the meridian. This limit >>comes up as default ON

Well worth the money. The sensors arent perfectly square, so having a method to adjust them is pretty crucial.

I would love to see how that works. I've been thinking about a QHY 600 camera. Rolando

Nice looking rig. Love my Eagle pier my Mach 1 rides on.

Sorry, I have done now the right on! I will report when all is fine now! By the way I am imaging with a Stowaway on the Mach2. It is a nice combination and I am happy with the performance. I have

That is not a valid command. Roland

Hi Howard, I just started my mount. The first thing I saw a red blinking singn and in the error log window it says that the RA limits has reached. I tryed to clear it. It won’t. Then I send the

Hi Konstantin! $SLD0# won't do anything since it is not a valid command in the command set. :LR0# is the proper command, beginning with a colon : not a $ sign. By the way, that is a zero, not a

Well, Roland said it wrong and Howard said it right. Use :LR0# to turn off the RA limits at the Meridian. Rolando