chrobakx

Alright. Finally I had the time to test everything. Great news is there is no more star trail on unguided tracking. 60s subs are fine with nice round stars. Guiding is improved as well, but it still required fine adjustments. New bearings definitely work better than old ones.

Honestly don't bother with the polar scope, if you can use guide scope and sharpcap for polar alignment, very quick and easy. Regarding the controlling mount with the laptop, you have to check wether you have a 2.3 firmware. If yes then you'll need the Ascom driver(very basic) and USB cable. I can use the Carte du ciel for control. Edit Here is the link for the cable. https://astro-gadget.net/gadgets/cables/exos2-gt-rj9-usb-pc-interface-cable-3m-for-bresser-exos-2-goto-eq-mount If you have 2.2 firmware, then you better buy the Bresser cable and update the firmware first https://www.bresseruk.com/BRESSER-Computer-Cable-for-Remote-Control-of-MCX-Goto-Telescopes-and-EXOS-II-EQ-Goto-Mounts.html

I have the Bresser exos2 goto. Make sure the cables are connected as in the picture. Also do you have a power source with enough amps? Please post a picture with complete mount and everything you got with it. Thanks

Another update: Worm bearings are finally replaced, worm gears and motors adjusted. Now as before I need a clear sky to test everything properly.

Quick update. While I'm still waiting for the clear sky, I had an idea to swap DEC and RA worm gear housings to see if it will make any difference, because in theory DEC axis isn't moving so much and thus should be less worn out than RA axis. When I removed DEC worm housing I noticed the bearings wasn't moving freely, even after cleaning and adjustment, it wasn't as smooth as it should be. So I ordered 4 new bearings mr126 ZZ for both axis. I'm hoping this will make significant change in guided and unguided sessions.

Looking forward to next year PAS. Hopefully it won't be cancelled

Second that. I had this kit on eq3 mount and it was easy to use, tracking was spot on. No issue at all. I replaced the 6V battery holder for power bank.

Here is my cheap and simple solution for my skywatcher 150p. I built it based on this thread: Total cost was I think £12. It's working like a charm. It's smooth.

I agree with the focus, I'll fix it next time. But I disagree with the faster speed. PHD2 is sending two signals to RA motor. First the beginning of the move, then the end of it. It's not pulsing guiding despite the using Ascom driver. It's very basic goto mount. If I'll increase the side rail speed, mount will be chasing the signals from PHD2 and guiding will be even worse. It won't be able to keep up. We can talk theory as much as we can, but I need the clear sky to test all suggestions.

Not ST4. USB to camera and usb to hand controller via Ascom( very basic version).

I think it's on default speed, I tried to change it before, but unsuccessful, I don't know why. I'll check all the settings again. Lots of good suggestions. Edit: I realised, I'm not using EQMOD. I thought you was talking about settings in PHD. I know there is a option to change the side rail speed.

Since I got the SharpCap, this polar scope is obsolete. I can get perfect polar alignment every time now.

Hmm interesting, I never paid attention to this, I didn't know what it was doing. Thanks for pointing out. I'm always trying set up guiding speed to 0.25. I think the default is 0.5. Next time I'll set it to 0.125, that's the lowest speed in the controller. The thing with this mount is, even when I'm using Ascom driver, it's still sending signals just like when I'm using ST4 port, not pulsing signals. It's was proven. So the slower side speed I'll use, the more time will have the mount to react to signals from PHD2. I've been imaging last night with guiding. I took the screen shot of it, but it's in my laptop. I'll check the RA error later tonight Now I need clear sky. Thanks

I did that and I found tight spot actually. It was maybe on the on 1/4 of the RA drum gear, so it's not nice round anymore(who know if it ever was round from factory).

Also I'll have to do new calibration in PHD because mount was disassembled and there is no backlash. Thanks for help.

I'm trying first to sort things without the guiding. I don't know why the mount is doing what is doing. I have same problem as this guy from CN forum: https://www.cloudynights.com/topic/84084-is-this-periodic-error-lxd75/ "This evening I did an imaging run with my ZS66SD and LXD75 mount. My skyfog limit is a 1 minute exposure. More than half of the exposures are just fine -- nice round stars. However, the rest have slighly elongated stars. I seemed to get a few good exposures, then a few bad ones...then repeat. Over the course of an hour, about half of them are bad. The elongation is in one direction only -- RA. No wind tonight after sunset, so that's not it....no vibrations -- I wasn't in the observatory during the imaging run. It's not polar alignment...I was drift-aligned. No movment for five minutes at 316x with reticle eyepiece. Do you think this is periodic error? I have not done the Train PEC on this mount. Actually, one question about that. I know I must park the scope in order for it to remember its PEC. After awaking the scope (unparking it), can I manually move the scope around by unclamping the RA and DEC lock-down levers? With this cause it to lose its PEC?".

Before this mount I had the eq3 with enhanced dual motor drive and I was able to have nice round stars with pore PA with 30 to 60 seconds exposures unguided. Let say from 50 subs, 45 had nice round stars. Now the opposite. I think the problem is with the mount build quality.

Hello Not sure if I am in the right topic. Equipment: Bresser exos 2 goto Skywatcher 150p Canon eos 700d guide scope 32mm guide camera SvBony 305pro Here is my problem. Since May when I bought the 2nd hand Bresser exos2 goto, I have a problem to get nice round stars. Polar alignment is good based on sharpcap tool. For example two weeks back I was imagining the dumbbell nebula with 60s exposure unguided, from 55 frames, only 13 was ok with round stars. When I tried guiding, it was better, but I'm sure it can do much better. The attached photos of stars are all unguided. Last week I removed the RA motor, cleaned the worm gear and the RA gear, re-greased them and adjusted. I did same thing with motor gear and removed backlash between them. Last night I had first time to test the mount. I was hoping it will be doing better, but no. With 30s exposures the stars are little bloated, just not perfect. Is this the best what this mount can do? I may try to tighten the worm gear with Ra gear, maybe it will help. Thanks.

I think I found out where I should place the polaris. Currently in 2021 is 38.78 arc minutes from Ncp

Hello everyone. I have a Bresser exos 2 goto mount with illuminated polar scope. I believe this mount is at least 6 years old, same is the polar scope. Where I should put the polaris as we are in 2021? I believe it shouldn't be in the circle anymore. When I tested it, I place polaris in the circle and I was able do max 20 seconds exposure frames, then I place polaris in the dash closest to the centre and maximum exposure time was maybe 5 seconds without the star trail. Anybody can help me with this please? Thanks Martin.