Re: Mach-2 can not reach target


diogenes ofsinope
 

Bill ... I'm building a 130EDFGT / Quad TCC / IMX455 imaging train now. Do you attribute the extra 2.3mm to the additional optical distance from a nice ~3mm thick filter element between your sensor and the Quad TCC?

Michael

On Mon, Aug 17, 2020 at 6:28 PM Bill Long <bill@...> wrote:
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 put the camera on a flatfield DK, and I have most of the tilt solved. Then I will try again on the TCC when the camera is fairly well tamed to begin with. big chip, really small pixels, so it is pretty brutal to get dialed in on fast optics.

I added 2.3mm to the spacing published for the Quad TCC and that seemed to be the point of least remaining curvature. I could not get the far edges to cooperate though so I may still have more work to do.  


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Dale Ghent <daleg@...>
Sent: Monday, August 17, 2020 4:23 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
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>




Join main@ap-gto.groups.io to automatically receive all group messages.