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savcom

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    Wiltshire, UK.

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  1. Interesting. I had the same issue using the Synscan Pro app last night on Android 13. Ruined my evening, as the mount would slew to target but not let me manually align. The buttons on the app would respond, but no movement from the mount. I'll check the firmware I'm running and see if it matches your configuration and I'll report back.
  2. This has been on my to-do list for months. A year or so ago I bought an old Helios Apollo 150 on a home-made Dobsonian mount compete with a 15mm eyepiece and a laser pointer, all for £50. I've used it a few times and it's been pretty good, giving clear views and providing a 'wow' factor at a couple of star parties where it's been used. But, looking critically through it, the views have had slightly odd-shaped stars with some coma around them, so I wondered if I could improve things. Recently, having sorted out the junk and built a second bench in my workshop, I was able to spent an afternoon collimating, cleaning and servicing the reflector. Sorry if this is a little picture heavy.: Having noticed that there was no central spot or mark on the main mirror, the first step was to gently remove the main mirror, inspect and clean it and then add a small central mark for collimation. The mirror looked in good shape. Most of this was successfully blown off by the hurricane blower I used. Measuring where the centre spot should go and then placing the mask at the centre All done and starting to re-build the scope. Note below the suspension for the mirror - 3x o-rings on each of the three mounting bolts. However, it all went back on with a bit of coaxing With no eyepiece inserted the centre spot is visible where it should be! Now we set up and collimate - starting with the secondary mirror then we adjust the primary mirror to put the laser light back to the eyepiece Next step was to strip and clean the sticky residue from the focuser. Remove, strip and clean first: : Then some Geoptik Type 1 on the ratchet and worm and then re-assemble. And finally it's all back together: But was it worth it? I think so. This is M27 - the Dumbbell Nebula - taken on what rapidly became a foggy night, so less than 30 minutes exposure using an Altair Hypertec 533C. Some purple fringing was removed, but overall not a bad result for a £50 scope and about 90 minutes work.
  3. There will be no formal speaker at our July meeting. instead we are holding an informal 'equipment clinic' meeting where we can discuss any technical kit issues, or just show off your new toys! Maybe you're thinking of buying a telescope. Maybe you're wondering how to take pictures of the night sky. Maybe you're looking for an upgrade - or even to sell. Why not come along and discuss it - or just come along for a chat. We're a friendly club situated on the edge of the New Forest and welcome everyone, from the novice to the expert. If you are interested in coming along, please drop me a PM or email membership@fordingbridgeastro.org.uk and I'll pass on the location and more details. Martin Davies
  4. I've just added a focuser to my setup and this was the result from its First Light:. July 9th's 79% Waxing Moon, 275 frames videoed on my Altair 533C through an Altair 72 EDF refractor then grading, stacking and sharpening the image through PIPP, Autostakkert and Registax, followed by a change of colour temperature and some colour gently added in GIMP.
  5. Welcome to SGL! Looks like we're not too far apart!!
  6. Still worth doing though. And, if you're connecting this laptop to the internet, try and make some time to upgrade it to Win 10. It's still free to do.
  7. If you can, increasing your RAM will help. Windows 10 itself struggles to be comfortable in 2GB, preferring 4GB. Even then you can often end up with only around 1.25GB left for programs once everything is loaded. Pricing Samsung DDR3 Ram, I have just increased my laptop capacity from 4GB to 8GB for £20 (Amazon).
  8. That's worth considering - unless I keep the SAP for wide-field shots or timelapse.
  9. Thanks for the link. I'll order that anyway after Christmas. As for the Slew Rate, it sounds as if the AZ-GTI is hampered in the same way as the Star Adventurer Pro - or do I gather that the AZ-GTI has encoders from your comment about not losing alignment?
  10. I've been looking long and hard at tthis mount, so this thread has come about at just the right time! I have a Star Adventurer Pro, which is great, but the thought of making a simple goto portable system really appeals - and there seems little else to touch the AZ-GTI mount for its capabilities. I've thought about adding a stepper motor to the Star Adventurer Pro to motorise the DEC axis (that may still be something to do while the clouds are here... 🤪) but that may be a step too far (excuse the pun) as the RA-axis will still only slew at 12x Sidereal. What's the slew rate of the AZ-GTI? As I have the SAP, I also have the tripod, so I was wondering if you can get hold of the pier extension seperately - or do I have to buy the whole caboodle just to get the extension? Does anyone know?
  11. Slightly off topic - but it's always more satisfying to ask your observer to describe what they see - it makes them look a little harder at the object.
  12. Don't forget that a youngster can probably see more of the stars in the sky than we can, so their view of Andromeda, for instance, will likely be more colourful and brighter to them than it seems to us. Likewise the Orion nebula.
  13. A very warm welcome from the Other End of Wiltshire - just south of Salisbury..
  14. I have tried and failed to balance my Altair 72mm with camera on my Star Adventurer Pro with the supplied counterweight, so I decided to add another counterweight. Looking at the cost of additional weights I thought I could do better for less, so to speak, so I set about looking for an additional 4-500g weight and working out how to add it securely to the shaft. I'd caught sight of someone else who had managed to balance their Skywatcher Evostar 72ED using a mallet head, so decided to use that as my solution. Here's what I had to do to make one. First step is ordering the mallet, of course: Next was to fit it. Easy! No. Seriously, I did make a slightly better attempt at this.... In short, you need a 400g mallet (mine was 60mm in diameter) a 70mm M6 coachbolt, an M6 metal washer and an M6 nut. First step is to cut the handle of the mallet off The counterweight shaft on my Star Adventurer Pro measures 12mm diameter and is threaded with an M6 thread, so the next thing I did was take some measurements, I measured how much of the 70mm coachbolt was left protuding when it was fully screwed into the counterweight shaft on the Star Adventurer. The answer was 55mm, so the length of the threaded shaft is 15mm. After this, I drilled a 6mm hole right through the mallet head and widened the wooden handle end to 12mm to a depth of 12mm to allow for a washer and nut to sit on the coachbolt fixing it to the counterweight. This left me with a 15mm length of thread from the coachbolt which serves nicely to attach the counterweight to the Star Adventurer Pro. The end of the shaft goes into the counterweight by about 5mm ensuring a good, solid finish. Then all that's left is to assemble it: Final picture is of the new weight (the 'malletweight') against the original 6mm bolt and washer. Now looking to test all this when it's next a clear night. Total cost? £5 for the mallet and 45 minutes to think through and assemble. The coachbolt was left over from a previous project and the nut and washer were from my spares drawer. A drop of black paint on the exposed handle end will finish it off when I'm next in the workshop. This picture shows the new Counterweight against the M6 bolt and washer that were originally fitted.
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