Re: AP900 Gto Auto-Guiding woes.


Stuart Heggie <stuart.j.heggie@...>
 

LOL! I know. It was actually on my G11 being used for visual. It was on the pier beside the Planewave/Paramount. I got a mouse infestation in the Planewave and they tore out the heater wiring harness. It is returning to sunny California for a tune-up. 

I figured with the big camera and goto mount suddenly available, I should swap the AP155 onto the bigger mount and return to imaging with it. My near term goal is to get one of the newer cameras with the 4.5um pixels and put that on the back of the AP155. Should be a great pairing. Then I'll image with it full-time I think. The 9um pixels in my U16M really undersample the targets at the 155's focal length. Of course then I'll be in the market for another goto mount unless my AP900GTO CP4 frees up. It is currently occupied with a NP101is.

Stuart

On Fri, Oct 14, 2016 at 8:19 PM, 'Christopher Erickson' christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:
 

Putting an AP155 back into action as an "impulsive" act.

What a concept!

Christopher Erickson
Consulting Engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, October 14, 2016 10:22 AM
To: ap-gto@...
Subject: Re: [ap-gto] Re: AP900 Gto Auto-Guiding woes.

Christopher, I agree mostly with what you said. I think in my case, the
rings are old and the felt is pretty much crushed so my 155 isn't moving in
the rings like it might if the felt was thicker/newer.

The main difference between what I'm doing and what most people try is that
I'm not using a small refractor with a cheap focuser for a guidescope. I am
using a Borg guidescope that mounts directly into the ST-402ME. It has NO
focuser. The connection is rock solid. I think droopy focusers on
guidescopes are a bigger problem than flexure of the main scope inside the
rings. My 2 cents - worth every penny!

Like I said, I imaged for years with the set-up I described. 100% round
stars. I "just" put this set-up together again while I do some upgrades to
my primary imaging rig. I'm going to see if they remain attached to this
note but I put them here:
https://groups.yahoo.com/neo/groups/ap-gto/photos/albums/116213838 in case
they are removed by Yahoo.

BTW - like you I use an off-axis guider on my primary rig. A MMOAG. But I
don't have all the fittings to put it into the train on my AP155 and it was
an "impulsive" decision to put the AP155 back into action.

Stuart

On Fri, Oct 14, 2016 at 3:48 PM, 'Christopher Erickson'
christopher.k.erickson@gmail.com [ap-gto] <ap-gto@...> wrote:

>
>
> The only scope I have ever owned that didn't suffer from differential
> flexure between a piggyback guide scope and the main scope is my AP
> 130EDF-GT. That is why I ONLY use off-axis/radial guiders any more.
>
> Over in the Meade Yahoo groups that I haunt (I also have a 16" LX200GPS) I
> am constantly amazed over how many scope setups I see where there is an
> under-mounted SCT combined with a small Chinese refractor and a floppy
> focuser riding on its back. And not an OTA counterweight anywhere in
sight.
>
> Of course I rarely see any images taken with those scopes...
>
>
> Christopher Erickson
> Consulting Engineer
> Summit Kinetics
> Waikoloa, HI 96738
> www.summitkinetics.com
>
>
> ------------------------------
> *From:* ap-gto@... [mailto:ap-gto@...]
> *Sent:* Friday, October 14, 2016 8:44 AM
> *To:* ap-gto@...
> *Subject:* Re: [ap-gto] Re: AP900 Gto Auto-Guiding woes.

>
> Vince, you want the guide scope/camera to be fixed relative to the back of
> your imaging scope. Ideally mounted on the focuser but with your scope
that
> seems impractical. You could try a second pair of rings that are lower
> profile around the big tube and move them back as far as possible.
>
> What is the focal length of your imaging scope? AP makes a very elegant
> guider holder that mounts on the focuser. I'd talk to them about that vs.
> what you're trying in the photo if that set-up is suffering from flexure.
>
> BTW - I imaged for years with a 350mm focal length Borg 60mm guide scope
> mounted to the top plate on my AP155. I was able to stabilize it fine and
> never had an oblong star in all the years I did that. You should be able
to
> do what you're trying but it may need to be more securely attached than
> what I see in the photo. In my case, I had the guide camera, an ST-402ME,
> sitting firmly on the top plate of the cradle holding the AP155. The rear
> ring of the cradle nestled up against the focuser. The front of the Borg
60
> was held in a Losmandy 3-point ring and the body of the Borg 60mm was held
> in a second Losmandy 3-point ring. The three points were tightened down
> really hard.
>
> I'll try and get a photo of this set-up.
>
> Stuart
>
> On Fri, Oct 14, 2016 at 2:31 PM, salfranc@... [ap-gto] <
> ap-gto@...> wrote:
>
>>
>>
>> Hi,
>> I am not sure how I can better fit the guide scope to the mount. If you
>> could give me a picture or something to show me the best way I would be
>> really happy to modify my setup.
>> The cables are also showing on the image. I cannot get them any closer to
>> the centre of the imaging scope as they interfere with the CP3 cables
when
>> slewing east and west.
>> Image setup.
>> Setup-guiding
>>
<https://www.flickr.com/photos/61128796@N08/29693328394/in/dateposted-public
/>
>> [image: image]
>>
<https://www.flickr.com/photos/61128796@N08/29693328394/in/dateposted-public
/>
>> Setup-guiding
>>
<https://www.flickr.com/photos/61128796@N08/29693328394/in/dateposted-public
/>
>> Explore vince236's photos on Flickr. vince236 has uploaded 60 photos to
>> Flickr.
>> View on www.flickr.com
>>
<https://www.flickr.com/photos/61128796@N08/29693328394/in/dateposted-public
/>
>> Preview by Yahoo
>> Thank you
>> Vince
>>
>>
>>
>
>
> --
> Stuart Heggie
> http://www.stuartheggie.com/featured.html <http://www.stuartheggie.com>
>
>
>

--
Stuart Heggie
http://www.stuartheggie.com/featured.html <http://www.stuartheggie.com>

[Non-text portions of this message have been removed]

------------------------------------
Posted by: Stuart Heggie <stuart.j.heggie@...>
------------------------------------

To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gto
------------------------------------

Yahoo Groups Links




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