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Hello, I have since 2004 and Obsession 18" with Servocat and AN which is a fantastic scope. However I have a little issue right now: the azimuth movement (in goto mode) is on some places "slippery". What could be the reason? Could it be the ground board is worn out on those places (I don't see anything "wrong" there) , or could it be the tension of the spring which somewhat getting loose over time? But then why only on some places? Did anyone experience this issue too? Thanks for the feedback.

Hi all, Im wondering if anyone knows if the 16" scope cloak from Orion will fit over an obsession 15 classic? Anyone here use it? Orion Scope Cloak - 12"-16" Dobsonians | Orion Telescopes Orion Scope Cloak - 12"-16" Dobsonians | Orion Telescopes Keep Your Dobsonian Telescope Clean and Protected with an Orion Scope Cloak! Shop online - 100% satisfaction gua... Thanks, Tim -- 15" obsession classic

Does anyone know of a reliable online source for 1.25 inch aluminum tubes for truss pole construction? Thanks Chip Gentry

I want to sell my 18uc, along with some lenses. Does anyone know of a forum or site where I could list it fir sale ? Thanks, Bill W Sent from the all new AOL app for iOS

Hi, I wonder if anyone can help, please? I think that the Dew-Guard pads to the back of my secondary mirror on my 20" f/4 classic Obsession have come loose as it no longer seems to come on in use unless I hold the sensor between my fingers. It's nothing to do with the battery. On one occasion the mirror fell out, fortunately not when the OTA was in place and I pushed it back into the sleeve but suspect that the connections to the Dew Guard have become detached. My question is: how do I remove the secondary mirror properly and safely from the metal sleeve / holder? I can see some screws that may open up the cylindrical sleeve, but am not sure I should touch these. Thanks for any advice. Mike G-H, SW France.

Obsession Classic 18/F4.5 secondary configuration request help Hello, I want to upgrade my Obsession Classic 18" F4.5 for imaging with equatorial platform and Full Frame sensor (24x36) My questions : Use of a big Paracorr 3" from Televue Focus starlight instruments FTF3215B-A Starlight instrument adapter A32-3203-1 Adapter 3" Starlight instruments for the big Paracorr EC32-3205-3CR I change the secondary mirror for a 4" To adapt all this, I do not touch my current secondary cage, a new one will be manufactured, it will certainly be necessary to modify the length of the tubes to reach the focal point, the draw being different (currently I have the FTF2015BCR used with Paracorr 2, but I have this unpleasant vignetting with the 24x36) My questions are simple, would this configuration be the right one, do we agree, the only focuser at Starlight instruments capable of accepting the big Paracorr 3" from Televue is the FTF3215B-A model? (I have looked at the 3015 but the clear aperture is not big enough for big Paracorr from what I have read…) Thank you for your advice and comments. Sincerely, Guillaume.

Hi My name is Tony Calloway and I'm in the process of purchasing a second hand 15" Obsession telescope. Can anyone advise why I can't make direct contact either by phone or email with OBSESSION TELESCOPS Thank you tony

Has anyone replaced or does anyone know what size of the StellarCat drive wire. Not the electrical ones, the motor drive wire on Altitude. I can make the looped ends, but I really don't know the size. Does anyone know a source? Al

Obtained a used 15" Classic and looking for pdf of the manual. Any leads? Thanks, Al

Bonjour Guillaume, Firstly, attempting to use the Meade LX-200 protocol with the ServoCAT will not work because the ServoCAT "speaks" "servocat protocol" not "Meade LX-200 protocol". It's analogous to an entirely different language. :) Secondly, I think someone recently showed me the Asiair app running and they happened to point out that Argo Navis was listed in their supported devices list. This was news to me but I do not know which of the protocols we support they are referring to and Googling I have not been able to find any documentation that mentions it. Thirdly, what is it that you are really try to achieve? If you are trying to get Asiair app to remotely perform a GOTO of your mount, none of this will work. It might be possible for it to fill the Argo Navis FROM PLANETARIUM object, you push the GOTO on your ServoCAT handpad and then have it plate solve from there. Best Regards Gary Kopff Managing Director Wildcard Innovations Pty. Ltd. 20 Kilmory Place Mount Kuring-Gai NSW 2080 Australia Phone +61-2-9457-9049 sales@... https://www.wildcard-innovations.com.au You could also try setting the Argo Navis port to run the "meade" protocol at 9600 Baud and configure Asiair to connect to an LX-200.

Hi All, I really enjoy my Mallincam DS287 c and m cameras but keep looking at the larger DS432Ctec for my next camera purchase. Please check my calculations and basic telescope fundamentals. I have an 18" mirror with a focal length of 75" I think my DS287 sensor diagonal is .24446", so the point that fills the sensor is (75" X .24446)/18 = 1.02" (i.e. 74" from the primary mirror). If I were to install a DS432c the diagonal is 0.6929" so the location of the sensor should be (75 X 0.6929)/18 = 2.88" (72.12" from the primary) I am thinking the DS432c installed in my UC18 would have to be 1.86" further in than my DS287 camera. The brackets that support my trusses could be shortened by about 1.25" and I could raise my mirror up another 0.25" or so and I have about another 0.75" travel in my focuser. So I think I could put the DS432 on my wish list and talk my son the welder into making some shorter truss brackets for me if my math is right. Thanks in advance for checking my math. Richard

Learning a lot from reading the posts here! I recently placed an order for a UC18; expecting delivery sometime in November. I did have two questions which maybe the group can help with: 1. Dave K. told me ServoCAT is out of business, so no Go-To options at present, and nothing on the immediate horizon. But I saw something from Gary at Wildcard about a possible new drive system designed to interface with Argo Navis. This was around January, but I've heard nothing since (and Dave says he knows nothing more than that). Has anybody heard anything more? I was weighing whether to delay purchasing the scope until a new Go-To system was available, but who knows how long that will be. I see a lot of the big Dob manufacturers, and big mirror grinders, have gone out of business in the last few years, so I figure it's a good idea to get my hands on a proven optical/mechanical system now, and I can always retrofit a drive system later. 2. I'd be interested in making the wheelbarrow handles collapsible, which would make storage and transport much easier. (Of course they have to be removed entirely for observing, but for storage in my basement closet and transport in my car it would be a lot easier if I could simply remove or stow away the handle extensions, while leaving the first part connected to the scope.) Has anyone successfully done this? I think I've sketched out in my head how to do it, but as always it's nicer to learn from the mistakes of others than from your own :-) Best, Jeremy -- -.. . -. ..--- --.. .-.. --.- Jeremy P. Carlo jcarlo@... http://homepage.villanova.edu/jeremy.carlo Cell: (917) 612-2163 Work: (610) 519-3279 -.. . -. ..--- --.. .-.. --.-

Hi Sevan, Great to hear you have been doing satellite tracking with your Argo Navis for a while now. It's a lot of fun and it really gets the heart rate rising. It's really cool to do in that period at dawn when you have setup but it is not quite dark enough yet to observe deep sky objects. Appreciate you wanting to retain alignment but we invalidate for a couple of good reasons, one of which is to ensure your ability to find stuff will remain as accurate as possible. Whenever user objects are loaded via the SETUP LOADCAT menu, whether they be satellites, asteroids, comets or user defined objects, the alignment is intentionally and purposely invalidated. In the case of objects such as user defined objects, we want to ensure that if they had been used as alignment objects or TPAS sampled data themselves that if they suddenly are then erased the "wheel's don't fall off" so to speak. In programming parlance, we would refer to it as avoiding a "null pointer reference". The very object that say the alignment was referring to vanishes. The second and more important reason however is related to the fact that the FLASH memory in which the user objects reside is physically the same FLASH memory in which the program and data including the operating system reside. When Argo Navis boots the OS internally keeps track of time to very small fractions of a second. So for example, say you aligned on a star 100.0 seconds after the system starts and a second star at 132.562 seconds after the system started, a relative difference of 32.562 seconds during the alignment process. Since the Earth is rotating and with it the apparent position of the stars, the alignment process if also taking time into account including those sub-second timings when the star is centered. The type of FLASH memory Argo Navis uses is known as NAND FLASH and it is exceedingly fast to read from. Much faster than the type of FLASH say used on a USB stick or SIM card. However, FLASH memory writes times for all types of FLASH is slow. When Argo Navis writes to FLASH memory it effectively suspends all other background processing activity because the same memory it operates from is in a busy state whilst the FLASH device commits the write. It thus looses track of internal time, not by much, but depending on how much is written to the FLASH. Since Argo Navis needs to suspend operation it looses its tracking of sub-second relative time. Hence we purposely invalidate the alignment. The time of day clock - the RTC - however maintains time during FLASH writes so it does not need to be re-synchronized. The alignment invalidation can be inconvenient but it is there for a good reason. As you will be aware and is detailed in the Argo Navis User Manual, it is highly recommended to update the TLE's just before an observing run. Satellites in low Earth orbit in particular, such as the ISS have orbits that decay and change very quickly from day to day and split second timing is everything. The Argo Navis clock scaling feature also helps with precision timing. Enjoy those passes! Best Regards Gary Kopff Managing Director Wildcard Innovations Pty. Ltd. 20 Kilmory Place Mount Kuring-Gai NSW 2080 Australia Phone +61-2-9457-9049 sales@... https://www.wildcard-innovations.com.au

Hi, thank you for your reply , It seems he works well now, it's just that as wordpad is the default reader, when I reopen the file it's wordpad that opens it, but I had done well at the start with NotePad, the only problem is that I don't did not enter lines of 69 characters, with spaces to reach 69 characters per line it works now. I will also look at how to enter the coordinates of Comet and Asteroid, it seems to be different from the satellites, it seems to be necessary to put “|” of separation between each values... Excuse me for these questions, I discovered since this morning how to make it work for satellite / asteroid and comet..