Date   

Re: Lunar eclipe early Wed morning

thefamily90 Phillips
 

No, here are pics made with my IPhone held up to the eyepiece of my Stowaway.

JimP
Image.jpegImage.jpegImage.jpegImage.jpegImage.jpeg


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of dvjbaja <jpgleasonid@...>
Sent: Tuesday, May 25, 2021 5:43:26 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Lunar eclipe early Wed morning
 
Do you think I'll need a field flattener with the Stowaway and a full frame DSLR?  

-jg

On Tue, May 25, 2021 at 2:11 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
Stowaway with DSLR would be quite good. Certainly not too much.

Rolando



-----Original Message-----
From: Shailesh Trivedi <strivedi@...>
To: main@ap-gto.groups.io
Sent: Tue, May 25, 2021 3:59 pm
Subject: [ap-gto] Lunar eclipe early Wed morning

In Nor Cal it will be a clear night. The only 2021 total lunar eclipse begins around 1:45am Wednesday 5/26/21 with totality around 4:16am.

What FL is good? How about Stowaway with a DSLR? Too much? Then just a 400mm lens? Or even less?

And any recommendations for settings for AP 1100 GTO (perhaps an overkill but is all I got until my Mach2 arrives).

Shailesh

--
Roland Christen
Astro-Physics


Re: Lunar eclipe early Wed morning

dvjbaja
 

Do you think I'll need a field flattener with the Stowaway and a full frame DSLR?  

-jg

On Tue, May 25, 2021 at 2:11 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
Stowaway with DSLR would be quite good. Certainly not too much.

Rolando



-----Original Message-----
From: Shailesh Trivedi <strivedi@...>
To: main@ap-gto.groups.io
Sent: Tue, May 25, 2021 3:59 pm
Subject: [ap-gto] Lunar eclipe early Wed morning

In Nor Cal it will be a clear night. The only 2021 total lunar eclipse begins around 1:45am Wednesday 5/26/21 with totality around 4:16am.

What FL is good? How about Stowaway with a DSLR? Too much? Then just a 400mm lens? Or even less?

And any recommendations for settings for AP 1100 GTO (perhaps an overkill but is all I got until my Mach2 arrives).

Shailesh

--
Roland Christen
Astro-Physics


Re: Lunar eclipe early Wed morning

Roland Christen
 

Stowaway with DSLR would be quite good. Certainly not too much.

Rolando



-----Original Message-----
From: Shailesh Trivedi <strivedi@...>
To: main@ap-gto.groups.io
Sent: Tue, May 25, 2021 3:59 pm
Subject: [ap-gto] Lunar eclipe early Wed morning

In Nor Cal it will be a clear night. The only 2021 total lunar eclipse begins around 1:45am Wednesday 5/26/21 with totality around 4:16am.

What FL is good? How about Stowaway with a DSLR? Too much? Then just a 400mm lens? Or even less?

And any recommendations for settings for AP 1100 GTO (perhaps an overkill but is all I got until my Mach2 arrives).

Shailesh

--
Roland Christen
Astro-Physics


Lunar eclipe early Wed morning

Shailesh Trivedi
 

In Nor Cal it will be a clear night. The only 2021 total lunar eclipse begins around 1:45am Wednesday 5/26/21 with totality around 4:16am.

What FL is good? How about Stowaway with a DSLR? Too much? Then just a 400mm lens? Or even less?

And any recommendations for settings for AP 1100 GTO (perhaps an overkill but is all I got until my Mach2 arrives).

Shailesh


Model corrected coordinates through the command protocol?

Brent Boshart
 

Is it possible to get model corrected coordinates through the command protocol?  See the example below.  If I turn "Point Corr" off in APCC then the coordinates match.


Re: Should I use my BARADV for the upcoming lunar eclipse?

Daniel Borcard
 

Nick,

Daniel

Thanks for that explanation. It made sense until you said "aim at an f ratio (i.e., F/D) equal to 5 times the size of a pixel in microns." Can you intuitively explain why? Failing that the maths would be a good explanation.

The scope has a resolution of 1 arcsec and without a barlow that is about 1 arcsec per pixel for my camera. Your formula says I need a 3x barlow. Spreading that 1 arcsec over 3x3 pixels kind of makes sense for "smoothness."

-- Nick

You prompted me to translate a document that I have used in several talks. It presents the (simple) equations leading to the 5 x pixel rule of thumb. The original was in French. You can find the English version here:


A note on tracking: a 15 second exposure is quite a long time unguided. Especially on the moon which doesn't travel at the sidereal rate. The lunar rate setting on APCC is only approximate since the lunar rate varies during the lunar cycle. And it's RA only so doesn't account for declination drift. So halving that to 8 seconds could be quite a good thing.

Why on earth would you like to expose 15 seconds on the Moon? I mean, imaging the Moon is like taking a photograph of a brightly sunlit rocky landscape (it *is* a brightly sunlit rocky landscape). With the usual cameras the subexposure time is in the order of one to five milliseconds. Ideally you take thousands of them with a video camera, and this only takes several minutes at most, during which the Moon does not have to stay strictly at the same place on the sensor. Stacking programs like AutoStakkert!3 will take care of the drift afterwards. I simply set my mount to the Moon rate, and from time to time I adjust the declination manually during or between the movies. 

Good luck!

Daniel

--------------------------------------------------------------------
Daniel Borcard
Observatoire du Geai Bleu
Le ciel est assez grand pour que chacun y trouve sa place.
--------------------------------------------------------------------








Re: #Mach2GTO C14Edge HD rig #Mach2GTO

Roland Christen
 

I think I will leave it up to others who have similar setups to comment about the feasibility of your setup. i have not tired a C14 myself and nobody around here has such a beastie.

Using off-axis guiders is definitely a requirement for guiding any SCT. Unguided imaging is iffy due to optical component flex.

Rolando

-----Original Message-----
From: EmP <padhye.mihir@...>
To: main@ap-gto.groups.io
Sent: Tue, May 25, 2021 12:38 am
Subject: Re: [ap-gto] #Mach2GTO C14Edge HD rig

Hi Roland,
Thanks for the reply. I will be using ZWOASI 174MC camera (not the mini version. Sorry for the typo) for OAG. Will this be ok or do you recommend any different camera?  I will also add Moonlight motorized focuser (Nitecrawler provided I manage the backfocus or the 2.5" CHL). Can Mach2 handle this rig comfortably?

Regards,
Mihir

--
Roland Christen
Astro-Physics


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

dvjbaja
 

Wow, and I thought my Mak 10 was undermounted on the 1100.  ???

J



Sent via the Samsung Galaxy Note9, an AT&T 5G Evolution capable smartphone


-------- Original message --------
From: deonb <deonb@...>
Date: 5/24/21 11:49 PM (GMT-08:00)
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] #Mach2GTO C14Edge HD rig

I have this setup - even heavier than yours since I have to add 7-lbs of counter-balance to the front of my OTA. (I can't push the OTA up forward enough since it will bump up against my observatory dome).

I also have a 3 motorized focusers on mine - mirror, image train and OAG - as well as a rotator, so add another 5 lbs.

I did removed my dovetail bar at the top and mounted my UPBv2 underneath. This reduces the weight and the moment arm. Mounting items at the top requires significantly more counterweight than mounting them at the bottom. In general the mount is a lot happier with everything pulled in closer, so I would say try to avoid the top dovetail bar (and accessories) if you can.

Roland also had to help me with a configuration specific to this weight class, but it's flawless now.  It's certainly on the edge of the graph, but it's not over, and it works very very well.

I don't generally do unguided since APPM is painful with a dome, and it currently doesn't support NINA or ASTAP. However, I have set that up as well to try out. I was able to get 10 minutes at 2800mm and 5 minutes at 3910mm with a so-so APPM map. I was impressed, but I'll wait for ASTAP integration before trying that again. Nothing to do with the weight though - it's obviously able to handle unguided at that weight.

I wouldn't call my configuration "comfortable". You have to really think about where you want to mount stuff, and you have to balance everything perfectly. I would imagine with an EdgeHD 1100 on there you can probably just throw things on wherever they will stick, and it will work. But in the end it does work with the heavier scope. I find it hard to imagine a 1100GTO would give you any better results, but it will likely give you a bit more breathing room.


Re: About APCC and ISS tracking and PC Time

Dale Ghent
 

On May 25, 2021, at 05:31, Bob <astro@dinoworld.com.au> wrote:

Thanks Ray. Although, APCC could still use the GPS time without updating the computer time perhaps, which would get around the admin issue? I guess this could be problematic for other software though. I guess I will go with some third party software then.
The same clock discipline considerations that exist when syncing time to the PC clock would also exist when syncing to the mount. The PC clock and mount's own clock should also be in sync for reasons including proper precession calculations anyway, so it's best for the mount to be programmed with the PC's time, and the PC's clock to in turn be properly synchronized with a time source.

Time sources and synchronization on the PC is going to be far more flexible and readily doable in a correct way anyhow. NTP infrastructure takes care of these details in whole, with time sources being other NTP servers on the internet to local NTP infrastructure that's uses local time sources, such as a GPS receiver, rubidium clocks, or even NIST's WWV and WWVH shortwave radio. Absent NTP but with a GPS receiver on Windows, you can use NMEATime2. As far as the GPS function in APCC goes, it's useful for your lat/long. Time is going to be a more advanced concern.

As an aside, here's a little neat thing about time sync services, at least here in the US: The US Naval Observatory and NIST still operate telephone lines for their time services. You can call them at any time to hear an audible 1 PPS tick with time announcements every minute. It's pretty moot in the age of mobile phones that have clocks that are synced to the telephone switch's own atomic clock, but If anyone feels like hearing the voices of broadcasters Fred Covington (USNO) or John Doyle (WWV) crooning out the time at 2am, one can still do so.


Re: About APCC and ISS tracking and PC Time

Bob
 

On Mon, May 24, 2021 at 08:32 PM, Ray Gralak wrote:
Hi Bob,

I'm really quite surprised that APCC cannot utilise gps time directly. I bought a $10 usb gps and it works well with
APCC. When I went looking for the setting in APCC that would allow me to utilise the gps time instead of PC time, I
couldn't find it. Now I know why.

Any idea if/when this feature will be introduced?
It probably will not be a feature of APCC because to set the time on the computer APCC would have to be run "as administrator". That is something we probably would not want to do because then the ASCOM driver would not be able to automatically start APCC.

If you have a network connection, you could use Dimension 4. Also, some inexpensive or free utilities supposedly can update the system time with some GPS devices. One I have run across is called "VisualGPS", but I don't know if it will work with the device you have.

-Ray
Thanks Ray.  Although, APCC could still use the GPS time without updating the computer time perhaps, which would get around the admin issue? I guess this could be problematic for other software though. I guess I will go with some third party software then.


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

Jeffc
 

Mihir --

Fwiw.. I've currently got a Meade12" ACF (labeled "RC" tho) on the Mach2:
- 16" dovetail saddle,
- Pegasus UPBv2, 
- QHY268M+FW,  (2x2 bin)
- Lumicon GEG (using the reducer only, unguided), 
- Clement Belepheron 3 focuser (rather massive),
- Robofocus motor,
- Dew strap and an orion flexishield,
- and Polemaster on the polar axis hole.

All sitting on an Eagle tripod with two 8" sections (max height).

I'm using pretty all the counterweights I have and it fills up the CW shaft almost completely.

Honestly I'm not sure I could put any more counterweight on the shaft.

Fwiw, I'm currently figuring out the APPM thing -- my horizon is non trivial with trees sticking up all over the place.
I did get a "medium size" model and was super impressed on how objects at about 1700mm FL (12" F/10 with reducer at 6.3) would land smack in the middle of the sensor after a goto.

I think unguided imaging is working with this setup but unfortunately the moon has been hindering anything but short 2 minute exposures.

The meade 12 on the mach2 is kind of an experiment until I get some focus motor issues worked out with the 130GT and Tak FS128 and nebula season returns.
But I am also intrigued w/ running f/4 using the GEG reducer -- however I will need a custom adapter for the camera side of the GEG.
I typically use the 12" for public outreach at an observatory on an AP1200 (or AP1100), but am planning on switching to the Mach2 when the season returns in 2022.
The meade 12" weighs about 40 lbs without the focuser, camera, etc.

-jeff

On Mon, May 24, 2021 at 10:51 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Just my personal opinion, the biggest SCT and cam setup I would put on a Mach2 would be a C11.

My C14 rides on my 1100GTO, which is a very good match for it.

"My advice is always free and worth every penny!"

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Mon, May 24, 2021 at 7:38 PM EmP <padhye.mihir@...> wrote:
Hi Roland,
Thanks for the reply. I will be using ZWOASI 174MC camera (not the mini version. Sorry for the typo) for OAG. Will this be ok or do you recommend any different camera?  I will also add Moonlight motorized focuser (Nitecrawler provided I manage the backfocus or the 2.5" CHL). Can Mach2 handle this rig comfortably?

Regards,
Mihir


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

deonb
 

I have this setup - even heavier than yours since I have to add 7-lbs of counter-balance to the front of my OTA. (I can't push the OTA up forward enough since it will bump up against my observatory dome).

I also have a 3 motorized focusers on mine - mirror, image train and OAG - as well as a rotator, so add another 5 lbs.

I did removed my dovetail bar at the top and mounted my UPBv2 underneath. This reduces the weight and the moment arm. Mounting items at the top requires significantly more counterweight than mounting them at the bottom. In general the mount is a lot happier with everything pulled in closer, so I would say try to avoid the top dovetail bar (and accessories) if you can.

Roland also had to help me with a configuration specific to this weight class, but it's flawless now.  It's certainly on the edge of the graph, but it's not over, and it works very very well.

I don't generally do unguided since APPM is painful with a dome, and it currently doesn't support NINA or ASTAP. However, I have set that up as well to try out. I was able to get 10 minutes at 2800mm and 5 minutes at 3910mm with a so-so APPM map. I was impressed, but I'll wait for ASTAP integration before trying that again. Nothing to do with the weight though - it's obviously able to handle unguided at that weight.

I wouldn't call my configuration "comfortable". You have to really think about where you want to mount stuff, and you have to balance everything perfectly. I would imagine with an EdgeHD 1100 on there you can probably just throw things on wherever they will stick, and it will work. But in the end it does work with the heavier scope. I find it hard to imagine a 1100GTO would give you any better results, but it will likely give you a bit more breathing room.


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

Christopher Erickson
 

Just my personal opinion, the biggest SCT and cam setup I would put on a Mach2 would be a C11.

My C14 rides on my 1100GTO, which is a very good match for it.

"My advice is always free and worth every penny!"

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Mon, May 24, 2021 at 7:38 PM EmP <padhye.mihir@...> wrote:
Hi Roland,
Thanks for the reply. I will be using ZWOASI 174MC camera (not the mini version. Sorry for the typo) for OAG. Will this be ok or do you recommend any different camera?  I will also add Moonlight motorized focuser (Nitecrawler provided I manage the backfocus or the 2.5" CHL). Can Mach2 handle this rig comfortably?

Regards,
Mihir


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

EmP <padhye.mihir@...>
 

Hi Roland,
Thanks for the reply. I will be using ZWOASI 174MC camera (not the mini version. Sorry for the typo) for OAG. Will this be ok or do you recommend any different camera?  I will also add Moonlight motorized focuser (Nitecrawler provided I manage the backfocus or the 2.5" CHL). Can Mach2 handle this rig comfortably?

Regards,
Mihir


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

Worsel
 

I cannot comment on the weight capacity, but you should be OK with your OAG

Bryan


Re: [ap-ug] Mach2 vibration & noise issue from the RA axis

davidcfinch9
 

Roland,

Can you also send me that email. My Mach 2 also has that resonance vibration.

Regards,

David C. Finch

df121819@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Roland Christen via groups.io
Sent: Monday, May 24, 2021 10:49 AM
To: astrocnc@...; main@ap-ug.groups.io; main@ap-gto.groups.io
Subject: Re: [ap-gto] [ap-ug] Mach2 vibration & noise issue from the RA axis

 

The stepper motors will hit resonant points if the belt tension is set too high. If you send me an e-mail I will walk you thru setting the belt tension so it doesn't do that.

 

Roland Christen

Astro-Physics Inc.

 

-----Original Message-----
From: Harley Davidson <astrocnc@...>
To: main@ap-ug.groups.io; main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Sat, May 22, 2021 9:39 pm
Subject: [ap-ug] Mach2 vibration & noise issue from the RA axis

 

As per my video link above I have just noticed a vibration and noise

issue from the RA axis. It only does it when going from the west side to

the east side of the mount. Also, the Go-To speed must be at 1000 or

1800. Whats up???

 

thanks  tony

 

BTW - here is the description on my YouTube page for this video:

 

Tonight, May 22 - 2021 I noticed a vibration from my Astro-Physics Mach2

mount at the 1000 and 1800 Go-To rates coming from the RA axis. It only

occurs when going from the west side of the mount to the east side.

 

Clip 2 is @ 1800 WEST SIDE to park 3

Clip 3 is @ 1800 EAST SIDE to park 3

Clip 4 is @ 600 WEST SIDE to park 3

Clip 5 is @ 1000 WEST SIDE to park 3

Clip 6 is @ 1800 WEST SIDE to park 3

Clip 7 is @ 600 WEST SIDE to park 3

Clip 8 is @ 1000 WEST SIDE to park 3

 

The rest of the video is documented verbally by me.

 

 

 

 

 

 

 

 

 


--
Roland Christen
Astro-Physics


Re: Question re: Initial setup with GTOCP4

Jil Tardiff
 

Perfect - looking forward to getting this mount up and running!

Thanks a million for the info.

JT


Re: Question: How do I safety replace the CW shaft adapter

Roland Christen
 

The gearbox is not attached to the counterweight shaft adapter. Use a large Phillips head screw driver and tap it with a hammer in CCW direction.

Roland



-----Original Message-----
From: Cheng-Yang Tan via groups.io <cytan299@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Mon, May 24, 2021 11:17 am
Subject: Re: [ap-gto] Question: How do I safety replace the CW shaft adapter

Hi Roland,
   So I don't need to disengage the clutches or the gear box?

   I can definitely tap with the best of 'em :)

cytan

On Monday, May 24, 2021, 10:08:48 AM CDT, Roland Christen via groups.io <chris1011@...> wrote:


Tap the Allen wrench with a hammer and it will loosen the adapter.

Roland



-----Original Message-----
From: Cheng-Yang Tan via groups.io <cytan299@...>
To: main@ap-gto.groups.io
Sent: Mon, May 24, 2021 8:42 am
Subject: [ap-gto] Question: How do I safety replace the CW shaft adapter

Hi guys,
   I just received the new AP1100 CW shaft adapter with SS insert and I want to replace the existing one without the SS insert. I removed the CW shaft and my telescope and then in the park 3 position,  I inserted an allen wrench into the holes of the adapter and applied some force. Nothing moved. I didn't want to apply more persuasion because I was afraid to damage the gears because the clutches were still engaged and so were the spring loaded gear boxes.

   So before, I apply more persuasion, what is the safe way to do this without damaging anything?

Thanks for any advice.

cytan

--
Roland Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: Question: How do I safety replace the CW shaft adapter

Cheng-Yang Tan
 

Hi Roland,
   So I don't need to disengage the clutches or the gear box?

   I can definitely tap with the best of 'em :)

cytan

On Monday, May 24, 2021, 10:08:48 AM CDT, Roland Christen via groups.io <chris1011@...> wrote:


Tap the Allen wrench with a hammer and it will loosen the adapter.

Roland



-----Original Message-----
From: Cheng-Yang Tan via groups.io <cytan299@...>
To: main@ap-gto.groups.io
Sent: Mon, May 24, 2021 8:42 am
Subject: [ap-gto] Question: How do I safety replace the CW shaft adapter

Hi guys,
   I just received the new AP1100 CW shaft adapter with SS insert and I want to replace the existing one without the SS insert. I removed the CW shaft and my telescope and then in the park 3 position,  I inserted an allen wrench into the holes of the adapter and applied some force. Nothing moved. I didn't want to apply more persuasion because I was afraid to damage the gears because the clutches were still engaged and so were the spring loaded gear boxes.

   So before, I apply more persuasion, what is the safe way to do this without damaging anything?

Thanks for any advice.

cytan

--
Roland Christen
Astro-Physics


Re: #Mach2GTO C14Edge HD rig #Mach2GTO

Roland Christen
 

You are going to guide a C14 with a mini-guide camera? It will not work well because the C14 and guide scope will not be in sync for very long (differential flex, mirror shift, etc etc). Bad idea unfortunately.

Roland

-----Original Message-----
From: EmP <padhye.mihir@...>
To: main@ap-gto.groups.io
Sent: Sun, May 23, 2021 7:12 am
Subject: [ap-gto] #Mach2GTO C14Edge HD rig

Hi Roland,
Can the Mach2GTO (with AP 16" EAsy balace dovetail on Eagle 6 mount) comfortably handle the below OTA and image train -

C14 Edge HD OTA 
Additional Losmandy Dovetail bar on top of OTA
C14 edge HD focal reducer
Astrodon/Farpoint AStro MOAG with mini guide camera
QHYCFW3l filter wheel
QHY268M camera
Pegasus UPBv2

Regards,
Mihir

--
Roland Christen
Astro-Physics

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