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michelbechara

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  1. @johninderby Thanks for the suggestion! I actually got a concenter and have been trying to try most positions of the secondary but the circles never seem to be concentric with the secondary....it feels like the secondary needs to be pulled away from the primary even more but it is the highest it could reach How much would this actually affect the visual performance of the telescope? I understood that it could impact the field illumination but the primary collimation would affect the sharpness.. Any tips would be greatly appreciated
  2. Hello, I am having some trouble collimating my 12inch f4.5 truss dobsonian and getting different results between the Cheshire and the laser method. Everything looks very aligned through the Cheshire key (picture attached)...however if I then insert the laser, everything is not aligned, the reflection of the secondary is not hitting the centre of the circle of the Primary and the reflection of the Laser is way off....(pictures attached) I have been told that 'the reflection of the secondary in the primary will not be centered with the other reflections, but that ok, as the secondary itself is not exactly centered on the optical path (there is a tilt, which is due to the focal ratio ( fd 4,5). If it where fd 5 or more, it would be centered, and there would not be any tilt' If this is the case, then I guess it is normal for the laser not to be aligned or am i missing something ? Thanks a lot for the help :)'
  3. @Jan-S I cancelled my order as TS also pushed the expected delivery date until the end of July....as far as I understood, I do not think that these telescopes are being built by Michael himself, maybe they are being outsourced by TS and they produce them under his guidance...not sure what kind of agreement they have. I ended up ordering the telescopes made by the dobsonian factory and you could actually communicate with the producer and he was very responsive and could respond to all the questions Hope this would help!
  4. Hello, I am seeking any kind of thoughts / Advices from any Sumerian owner or Taurus because I am a bit lost on which telescope I should pull the plug on. Context: It has been nearly 7 months that I order my Sumerian Alkaid 12" via Telescope Express and the delivery now has been postponed till the end of June earliest. I am also a bit worried that the current batch is no longer being constructed by Michael and everything is being managed/outsourced by TS. So I am a bit worried about the output quality compared to the earlier models that were constructed by Michael specifically. This, on top of the TS being not very helpful, is making me doubt if there would be any dip in quality to the earlier models and if ever the production could ever be met in the next 6 month. The alternative I am considering is the following scope: Taurus T300 12" - Manufactured in Poland https://www.taurustelescopes.com/en/taurus-t300/ https://www.youtube.com/watch?v=lGIbld1H76w&t=174s The telescope at first sight seems more premium and high end compared to Sumerian, and at least their customer service is actually reachable and give you the technical details you are looking for. The problem that I have is that it is very important that the scope could be transported via Air travel, which is obviously the strongest trait of the Sumerian, compared to the Taurus which would need to be fitted in different pieces. The solution they told me is that I could transport dimensions of the lower cell with the primary mirror – 42 x 38,6 x 18cm on the carry on luggage, the rest can be transported in luggage. So I am facing a crossroad here and I am not sure which would be the best to my needs, obviously the Sumerian being the most practical for Air traveling but with some Production question marks or the Taurus which looks like a high production but less practical for travelling... Any thoughts to help me choose/make up my mind would be greatly appreciated Thanks!! Mich
  5. Hello, Could someone help me understand if there is any really observable difference between the following 2 eyepices for a f5 dobsonian (305/1500) 1) ES 14mm 82 deg Focal length: 14mm Mag: x107,5 Exit Pupil: 2,84mm FOV:82 TFOV:0,76 2) ES 12mm 92 deg Focal length: 12mm Mag: x125 Exit Pupil: 2,43mm FOV:92 TFOV:0,73 From looking at the data, the only notable difference is the higher mag achieved by the ES 12 mm and maybe a better contrast but by looking at the rest, it is looking pretty similar. The price difference between the 2 eyepieces is huge, the ES 14mm 82 deg priced at 175€ and the ES 12mm 92 deg 479€ so I am wondering if the price difference for the 12mm is justifiable? Could there be a better optical quality/better build that is being overlooked? Thanks for the helps and thoughts!
  6. Hello! I have a 130/920 Reflector telescope and want to buy either this 6mm eyepiece or 7 mm eyepiece. I know that the maximum magnification for that telescope is x260. The 6 mm will give me x153 magnification - with 2x Barlow x306 - with 1.5x Barlow x230 The 7 mm will give me x131 magnification - with 2x Barlow x260 - with 1.5x Barlow x197 The objective is to observe the planets and gets the most useful closeup image, mainly for Saturn and Jupiter. By looking at these, do you think I should go with the Planetary 6 mm or Cornus 7 mm to achieve the best viewing of the planets with the 1.5 Barlow lense? The planetary 6mm seems to achieve also higher contrast and clearer images compared to the 7mm and can have a good magnification with the 1.5 Barlow. What do you think or am I having a wrong approach to the topic? Any help/guidance is much appreciated!
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