Date   

Re: Polar finder scope query from a total beginner #polaralignment #iEXOS-100

Jed Fish
 

Hello, Adam , 
Re:  the latitude setting - if you’re referring to the scale printed on the mount, take it with a grain of salt, it’s just to get you close.  

I’m at just under 41 degrees and mine generally reads ~39 with Polaris anywhere in the tunnel. I’m strictly visual, so the tunnel (no polar scope...)  is close enough for me.  Others will respond with more accurate technical solutions that will get you centered on the North Celestial Pole, necessary for photography, but for now if the mount is level (at least on the north south axis) and Polaris is in the tunnel, that’s your latitude setting.

Even if the printed scale was perfectly precise, it could read much as 2/3 of a degree off (above or below the scale set to your exact latitude) if you were centered on Polaris instead of NCP.  

HTH, 


--
Jed Fish
ES ED102
iExos100


Re: Polar finder scope query from a total beginner #polaralignment #iEXOS-100

Wes Mcdonald
 

Adam. Ok iexos 100. Sorry

The peep hole is fine but it will be a poor polar aligner.  You may as well just center Polaris in the tunnel. That is fine enough for visual work IF you have a wide field finder scope.

What you are trying to collimate is your main telescope line of scope and your finder line of sight.  This is true of any finder scope.  Your peep hole is already collimated with your ra axis.

To do a 2-3 star alignment most easily you need to have your polar home pretty close.  Use my paper in the files section of the mounts subgroup.  

Get yourself a red dot finder.  It is far easier to identify the alignment star when you can view it through the red dot and see all the other surrounding stars.

Make sure you align the scope on the correct alignment star.  Use something like SkySafari to identify unambiguously the correct star you are supposed to use.

As for your latitude and lon suggest you use your tablet gps fix and set explorestars to use the tablet location. Save you from entering.  If it still comes up “wrong” then either the tablet didn’t get a fix or your idea of what right is wrong?  Can’t explain it any other way.

Final thing is for your gotos to be good after you do a 3 star alignment the mount dec polar home is paramount.  Second is cone angle.  Third is correct star centering.  PA is not that critical for 3 star as 3 star’s purpose is to correct for incorrect PA.  If you mark the Polar home using my method then it is important to ensure that when you set up to use the scope it is as level as it was when you marked the home location.

Wes 



--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: Polar finder scope query from a total beginner #polaralignment #iEXOS-100

Wes Mcdonald
 

To get collimated get the dead center of the polar scope on the dead center of the ra axis.  You have to do this by rotating the ra axis and adjusting so that the dead center of the polar scope never drifts off the target in the polar scope. Remember you are aligning the polar scope with the ra axis of rotation not the telescope which has its own ra axis collimation issues.

--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: Polar finder scope query from a total beginner #polaralignment #iEXOS-100

Adam
 

Thanks Michael for the speedy response. I'll double check the collimation as soon as possible. If I'm doing it right (which I may not be!) I'm centering the "target", a church spire over a mile away, in the polar tunnel, then using the collimating screws to get the target on the central point of the finder scope. OR should I be trying to get the spire to sit where Polaris should be? I'm going to keep Googling furiously.

The latitude setting still doesn't make any sense to me as when I have Polaris aligned I'm nearly 2 degrees lower at 49 and not 51 degrees. 


Re: iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Wade Prunty
 

Jerry,

Just in case you wanted more, here are the last there guide logs.

Thanks again!

Wade Prunty
Texas, USA


Re: Polar finder scope query from a total beginner #polaralignment #iEXOS-100

 

Could be one or two reasons, first thing I would do is check that your polar scope is properly collimated, there are plenty of tuition material on line that will help you with this. Secondly even if you have collimated the scope and polar aligned there will still be a bit of adjustment to get the star central. Even when I think I have a good polar align it can still be a bit off. The more you do it the better you will be. My next stop is the Polemaster for me, just to get a more accurate polar alignment. 
--
Michael Whitaker
Wakefield, UK. 
MOUNTS. Exos-2 PMC Eight..
SCOPE: RVO Horizon 72ed. 
CAMERA: Not Applicable. 
SOFTWARE: Just iPad at moment.


Re: iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Wade Prunty
 

Wes,

Thanks for the info. I will definitely try to balance with more weight to the camera side tonight, and see how it responds.

The ASIAIR Pro has a pretty accurate polar alignment feature, which can get you a good PA fairly quickly. I don't think its as good/easy as the PoleMaster system, but it's much much better than trying to get get precise PA using a polar scope. FYI, the Accurate Polar Alignment in TheSky's TPoint plugin is still the best polar alignment system I've ever seen, along with the most accurate results.

I did clean out all of the metal pieces, and when I did, I noticed something else. At the end of the worm gear shaft there is a hollow round cylinder with threads set into the gear block, which has a gap on two side that look as if they are there for some tool to screw it into the block. I ran my thumb across it and it was sharp, After taking a closer look it seems like who ever, or what ever, screwed this part in stripped those gaps. I think this could be where the metal debris came from. Once I'm done with this imaging session I'll pull the DEC cover off again and take a picture of it to share.

Thanks,

Wade Prunty
Texas, USA


Re: iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Wade Prunty
 

Jerry,

I'm attaching the PHD2 log file to this message. Thank you very much for taking a look at it.

Wade Prunty
Texas, USA


Polar finder scope query from a total beginner #polaralignment #iEXOS-100

Adam
 

Hi all,

Already finding this forum a wealth of information and other owners experiences invaluable. I have a feeling the vast majority are already well aware of polar alignment and such before owning an ES mount however I am not in that club. I'm struggling somewhat with polar alignment using the official iExos polar finder scope as the subject suggests. I only have a DSLR on the mount right now as the mount became available at a time when I knew I'd be able to build-up to getting a scope eventually so I took the leap and bought it.

I have noticed that when I think I've got the mount polar aligned correctly in both the polar tunnel (central is right, right??) and the finder scope (with Polaris (I HOPE!) in the bracket between 2000 and 2030) but haven't had any lucky trying to get the 2nd and 3rd stars lined up. I'm under Bortle 6 skies here but should these other stars be perfectly visible as Polaris is? I have an app (PSAlign for iOS) to show me how to rotate the reticle on the polar finder scope so I'm pretty sure I have that bit right.

On to my next question though, which may be related to the first...when I think I have the mount aligned and I check the latitude it's around 49 degrees instead of the 51.05 that I'm actually viewing from. Does that make any sense?

Sorry to sound as foolish as I think I'm sounding. I will absolutely appreciate any guidance anyone can give me. Sending links to anyone else who has set this mount up and can show me exactly how it's meant to be done would be great with a little explanation of what I'm meant to be memorising :-)

All the best to you all,

Adam


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Dan Kahraman <dkahra213@...>
 

James:

A pleasure to behold. Thanks for sharing.

Dan Kahraman

On Sun, 2 Aug 2020 at 05:58, James Hubbard via groups.io <jamesmhubbard440=yahoo.com@groups.io> wrote:
Here are a few pics I have taken with my Exos2 PMC8 and my iexos100 PMC8. All are single images. Nothing as good as I've seen shared, but I'm happy with the results for being a single shot.
--
William Optics Zenithstar 80edll
Skywatcher quattro 8
Meade 8" sct
Meade DS-10, outreach when I eat my wheaties
Explore Scientific first light 80- outreach
Explore Scientific Exos2 PMC8 
Explore Scientific iexos100 PMC8
Canon 60d 
Nikon d90
Zwo asi120mm
Zwo asi178mc
Samsung Galaxy 7 tablet
Amazon Fire10 HD tablet
Multiple windows laptops


Re: iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Dave Cherry
 

Totally agree with Wise Wes on this, you need to bias the camera-side weight distribution so there is a slight positive load on the mount at all times.
This looks like classic mount float as it hovers between drive and no drive (air gap). Just a mild wind can then blow of track when its in this hovering state.
I had this, but not quite a severe as your graph to be fair.
Think about when you feather the accelerator in your car when on a totally flat road.

And don't expect this phenomenon to improve much if you spent another 1000 dollars on your mount, There is no mount with zero backlash! 

Still a great picture you got, never the less.

Cheers
Dave




--
Scopes: Sky Watcher 200PDS, Skywatcher 72ED
Mount: Explore Scientific PMC8 EXO2
Cameras: ASI 294MCPRO Coooled, Altair guide cam + 50mm scope
Software: Sharpcap Pro ,PH2, Stelarium Startools


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Dave Cherry
 

Hi James, I think that's pretty much as good as can be expected with just a single shot/sub. well done.
Nice Neowise. Devilishly tricky little blighter to get, that one!
Cheers
Dave.
--
Scopes: Sky Watcher 200PDS, Skywatcher 72ED
Mount: Explore Scientific PMC8 EXO2
Cameras: ASI 294MCPRO Coooled, Altair guide cam + 50mm scope
Software: Sharpcap Pro ,PH2, Stelarium Startools


Re: iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Jerry Hubbell - Explore Scientific VP Engineering
 

On Sun, Aug 2, 2020 at 02:28 AM, Wade Prunty wrote:
Hello, I'm hoping I can get some good advice about what I'm seeing in my guiding on my iEXOS-100. A few imaging sessions ago I started seeing a recurring pattern in my guiding that "looks" a little concerning, but my subs don't necessarily prove it to be an issue. I've had really bad luck with multiple mounts and I really don't want to go through it with another one.
Hi Wade,

I would like to take a look at your PHD2 guide log(s) if possible. I can do further analysis to help understand what is going on with your mount. If you don't mind posting them on the forum that would be great. You can just attach the file to a response message on this thread if you like, or you can send it to me via a private message.

Thanks
 
--
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home


Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
Mounts
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!


Re: iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Wes Mcdonald
 

Wade

I would clean out the metal and see if it comes back. 

Your imaging setup has some interesting limitations.  Your image looks danged good to me

Your imaging resolution is about 3.7”. This is based on RSS of 2” seeing, 1” guiding, 2.7” airy disk.  Your image camera pixel is about 3.14”.  So it appears you are doing about as well as you can.  I can’t tell if your focus is spot on or if when I expand things I see resolution limitation.  Either way so long as you don’t pixel peep deep it looks good.

Those peaks you see in dec look to me like backlash. The dec graph seems really good until it wanders up or down.  Suggest you make sure your imaging setup is heavy on camera end of scope to try and keep those dec gears engaged. It’s a fact the iexos dec has some backlash.  Looks like you had really good polar alignment.  

Wes 

--
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

James Hubbard
 

Here are a few pics I have taken with my Exos2 PMC8 and my iexos100 PMC8. All are single images. Nothing as good as I've seen shared, but I'm happy with the results for being a single shot.
--
William Optics Zenithstar 80edll
Skywatcher quattro 8
Meade 8" sct
Meade DS-10, outreach when I eat my wheaties
Explore Scientific first light 80- outreach
Explore Scientific Exos2 PMC8 
Explore Scientific iexos100 PMC8
Canon 60d 
Nikon d90
Zwo asi120mm
Zwo asi178mc
Samsung Galaxy 7 tablet
Amazon Fire10 HD tablet
Multiple windows laptops


iEXOS-100 Guiding - Should I be worried about this? #iEXOS-100

Wade Prunty
 

Hello, I'm hoping I can get some good advice about what I'm seeing in my guiding on my iEXOS-100. A few imaging sessions ago I started seeing a recurring pattern in my guiding that "looks" a little concerning, but my subs don't necessarily prove it to be an issue. I've had really bad luck with multiple mounts and I really don't want to go through it with another one.

This pattern seems to have now become a permanent fixture in the mount, it has shown up every night now since it started. My weather is clear and my seeing has been is as good as it can get here in my area, so I don't think that has anything to do with this. I'm using a SpaceCat 51 APO with 250mm of focal length and a William Optics UniGude guide scope with 200mm of focal length, so my guiding and imaging focal lengths are extremely close. I have everything buttoned down extremely tight, so I don't think it is caused by flexure. My guide stars have been good, clear and in focus. I've gone over balance so many times, I don't think it can get any better.

So, I'm out of ideas. I just want to make sure if I call support I've done my due diligence before bothering them.

I opened up the DEC cover and found some extremely small pieces of metal debris, five of them that were smaller than the head of a ballpoint pen, but I could not find any missing material in the worm or gear. I have pictures of that below.

Does anyone know of any maintenance I could possible do myself to remove this from the mount guiding?

Thanks in advance for any help!

Wade Prunty,
Texas, USA
--------------------------------------------------------------------------------------------------
Gear List:
Explore Scientific iEXOS-100
William Optics SpaceCat 51 APO
ZWO ASI1600MM-Pro
ZWO EFW
Chroma 3nm Narrowband Filters (I'm seeing it across all filters and when non-filtered)
William Optics UniGuide Guide Scope
ZWO ASI120MM-S Guide Scope
ZWO ASIAIR Pro

Guide Graph (RMS is at .50-.70 outside of the high/low points):


Debris:


Example Sub (600 Second Ha)


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Dave Cherry
 

Nice one Wade, great wide shot from that Cat of yours. I can see the mount had no trouble with that FL.
Cheers
Dave

--
Scopes: Sky Watcher 200PDS, Skywatcher 72ED
Mount: Explore Scientific PMC8 EXO2
Cameras: ASI 294MCPRO Coooled, Altair guide cam + 50mm scope
Software: Sharpcap Pro ,PH2, Stelarium Startools


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Dave Cherry
 

Thanks Bob, I did eventually get 2 Hours on the Triangulum Galaxy after that. I will add more to it but here it is so far.
Apart from a stretch and a crop this is straight out of SharpCap. (re-stacked using the folder camera after I threw out any bad frames)
I'm quite pleased with it, only because I have never had a lot of luck before with galaxies!
No filters were used. composed of 3min subs at gain of 130,1 master dark,1 master flat and no bias.
I dithered the PMC mount in RA only for the first time.

Cheers
Dave


--
Scopes: Sky Watcher 200PDS, Skywatcher 72ED
Mount: Explore Scientific PMC8 EXO2
Cameras: ASI 294MCPRO Coooled, Altair guide cam + 50mm scope
Software: Sharpcap Pro ,PH2, Stelarium Startools


Re: Astrophotography Done with the iEXOS-100, EXOS 2, and G11 Post your Pictures and Details! Lets Show What These Mounts Can Do. #G11 #astrophotography #iEXOS-100 #EXOS2

Wade Prunty
 

NGC7000, The North America Nebula
William Optics SpaceCat 51
Explore Scientific iEXOS-100
Canon T3i DSLR
Optolong L-eNhance
ZWO ASIAIR Pro
50x300 Seconds
4.16 Hours Total Integration Time


Re: Explore Scientific EXOS-2 PMC-Eight GOTO Mount illuminated polar alignment + 90 degree polar alignment

nfred1952@...
 

Thanks Mike and Robert.
That helps and solves the illumination question.
Maybe got the wrong scope a Dobsonian, raising the tripod legs to gain more space for polar aligning would I can see help, but probably compromise if I just want to do just visual viewing
I was hoping to use for AP eventually.
I will check out iExos-100 comments, but he ho enjoying the learning curve, whats the fun if it all works first time!
Nick Frederiksen


On Fri, Jul 31, 2020 at 11:18 PM Mike Hammer <kmhammer1@...> wrote:

The polar illuminator unscrews (counterclockwise) in the middle. Inside are the batteries in a small tube. There is probably an insulator preventing the batteries from making contact. Carefully remove it (don’t lose the batteries or the insulator, they are tiny) and reassemble. It should work then.

 

To improve access to the polar illuminator eyepiece, you need to raise the tripod by extending the legs. When done doing this, make sure that the tripod is level using the bubble located on the top of the tripod. Adjust as needed.

 

Sent from Mail for Windows 10

 

From: nfred1952@...
Sent: Friday, July 31, 2020 5:47 PM
To: MAIN@espmc-eight.groups.io
Subject: [ESPMC-Eight] Explore Scientific EXOS-2 PMC-Eight GOTO Mount illuminated polar alignment + 90 degree polar alignment

 

Hi all

Recently purchased above mount, can anyone confirm if the reticule in the polar alignment scope should be illuminated, I can turn the small knob and I can hear a switch made but no illumination, what am I missing, retailer I bought from not sure, is there a battery somewhere?
Plus I am having great trouble polar aligning. I am at 53 degrees latitude here in NW UK its virtually impossible without lying on the floor to get an eyeball to the polar scope viewing lense, are there any simple solutions i.e a 90 degree prism device I can attach, I am aware of Polemaster and Sharpcap but don't want to shell out another 2-3 hundred pounds, any thoughts/help??
Nick Frederiksen

 

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