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 Dark then. 

I took some flats and just looked and the OIII flats show the halo as well. So, has nothing to do with my GTX+Flattener (not that I thought it did). 

---

From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Bill Long <bill@...>
Sent: Monday, August 17, 2020 4:56 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Mach-2 can not reach target

 

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. 

---

From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io>
Sent: Monday, August 17, 2020 4:55 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Mach-2 can not reach target

 

Should also show up in your flat field image.

Roland

-----Original Message-----
From: Bill Long <bill@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Mon, Aug 17, 2020 6:32 pm
Subject: Re: [ap-gto] Mach-2 can not reach target

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 anything either with the exact same spacers, adapters, and focuser (NiteCrawler). 

---

From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io>
Sent: Monday, August 17, 2020 4:29 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Mach-2 can not reach target

 

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

-----Original Message-----
From: Dale Ghent <daleg@...>
To: main@ap-gto.groups.io
Sent: Mon, Aug 17, 2020 6:23 pm
Subject: Re: [ap-gto] Mach-2 can not reach target

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 from Gerd Neumann, which should have arrived today but FedEx seem to have decided to start competing with UPS in my area for least reliable delivery.

Once I get that on with proper backspacing (I might be able to use an existing part I have, else it's another ~25 day wait for something from Precise Parts) I will hopefully be in business.

Bill's right, the IMX455 sensor that is in the QHY600/ZWO ASI6200 is an astounding performer and blows every prior generation of CMOS clean out of the water. Once the tilt and backfocus demon is tamed, that is.

> On Aug 17, 2020, at 6:20 PM, uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io> wrote:
>
>
> I have ASI6200 with a 7 position filter wheel attached behind the flattener.
> I would love to see how that works. I've been thinking about a QHY 600 camera.
>
> Rolando
>
>
> -----Original Message-----
> From: Konstantin von Poschinger <KPoschinger@...>
> To: main@ap-gto.groups.io
> Sent: Mon, Aug 17, 2020 4:46 pm
> Subject: Re: [ap-gto] Mach-2 can not reach target
>
> 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 ASI6200 with a 7 position filter wheel attached behind the flattener.
>
> Konstantin
>
> <IMG_2228.jpeg>
>> Am 17.08.2020 um 22:15 schrieb uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io>:
>>
>>
>> As Roland said I can prevent this with the $SLD0# command.
>> Well, Roland said it wrong and Howard said it right. Use :LR0# to turn off the RA limits at the Meridian.
>>
>> Rolando
>>
>>
>> -----Original Message-----
>> From: Konstantin von Poschinger <KPoschinger@...>
>> To: main@ap-gto.groups.io
>> Sent: Mon, Aug 17, 2020 3:10 pm
>> Subject: Re: [ap-gto] Mach-2 can not reach target
>>
>> Hello Howard,
>>
>> I have set the limits on both sides! The problem is to move from a cw up position on the east direct to a cw up position in the west. As Roland said I can prevent this with the $SLD0# command. I will test that.
>>
>> Grüsse
>>
>> Konstantin v. Poschinger
>>
>>
>> Hammerichstr. 5
>> 22605 Hamburg
>> 040/8805747
>> 0171/1983476
>>
>>> Am 17.08.2020 um 21:42 schrieb Howard Hedlund <howard@...>:
>>>
>>> Setting an appropriate meridian delay BEFORE the counterweight shaft goes up will also avoid the problem.  This is easily set in APCC.
>
>
> <IMG_2228.jpeg>