Quote:
Originally Posted by trickybilly
Hello everyone,
Tomorrow I'll go to buy my telescope. It is a "collapsible" ("Flex Tube") dobsonian (200/1200), f/6, central obst.:46mm. I'm a bit scared of the collapsible structure (stability?)...should I be?
P.S. Do I need to buy a tool for telescope collimation? Some Youtube videos show a tool for that...
I'm glad to have found a forum interested in amateur astronomy, best wishes all 
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Welcome to IceInSpace

General answer to your question is YES, they are stable and reliable.
But some are easier to use than others.
Which brand are you considering?
Where are you located?
Our general advice is to try to see some operating in the field before committing.
Did you check out the For Sale classifieds forum here on IceInSpace?
Collimation,
Although not essential, a collimation tool is highly recommended.
Again a variety is available and it is best to talk to users before committing.
I have had two Skywatcher collapsible DOBs (one is currently for sale in the classified section here) and I have been very happy with their performance and how easy they are to transport and set up.
Hope you enjoy your new hobby, and feel free to ask many questions on this forum.