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Thread: Help me 12dob and 200mm users

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    Lightbulb Help me 12dob and 200mm users



    I have a Skywatcher 70/900 eq1, 've seen some nebulae and several clusters with it, the orion nebula for example, I can see the brightest part well, the crab nebula is much harder to see any detail, the galaxy sombrero I see only a very weak spot if I look sideways. I plan to buy a dobsonian GSO 305mm,or Skywatcher 200p eq5, and my question is: Is visual observation going to make a lot of difference, especially in DSO? Someone who has a telescope similar and already had experience with both sizes please give me a light. I have already read that it is said to be able to see many galaxies and nebulae with details, but how is the orion nebula for example, and the hat galaxy, the upgrade really worth it. Sorry for bad english, I'm brazilian and I translate with google translate

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    Default Re: Help me 12dob and 200mm users

    Hello helderk7! Welcome to the forum and thanks for joining us!

    305mm will make a huge difference over your 70mm. No question about it.

    I have a 305mm GSO dobsonian. It is my most used scope. I also have 3 80mm, 1 90mm, 1 102mm, and 2 127mm. By far the GSO dob pulls in much more light.

    With this scope I've logged 1,532 DSO's, and 1,062 of these have been galaxies.

    Of course, with visual observing, don't expect the same level of detail as one sees in astrophotos. The human eye simply does not have the sensitivity as a camera sensor, nor can it sit on a target and gather photos with a long exposure like a camera can.

    Plus, most DSO's are varying shades of grey.

    Practice makes perfect in this game. The more you do it, the more detail you begin to pick out. I can pick out things with an 80mm scope that a new astronomer would be challenged to see with an 8" dobsonian. One has to train the eye to pick up these subtle changes in light level that mark dust lanes or a spiral arm in a galaxy. And local light pollution, current sky conditions, Moon phase, all are factors that contribute to the quality of an observation.

    Also, I highly recommend giving this a read to help you understand some concepts with DSO (especially galaxy) observing: Why Can't I See That Galaxy? - Astronomy Forums | Telescope Forums & Reviews | Astronomy Community

    Bryan

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    helderk7 (12-24-2017)

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    Default Re: Help me 12dob and 200mm users

    Thanks very much for the information my friend
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