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Dobsonian

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This Dobson telescope was my introduction to amateur telescope making (ATM) and was made largely following instruction from the sidewalk astronomy group ( the record chosen for the az bearing surface was one of the soft machines ).   The biggest difference is due to cardboard tubing being so expensive, that aluminum angle was used to make the the main structure of the tube.  As recommended 3/4 " plywood is used for the Dobson mount,  this makes it both incredibly sturdy and incredibly heavy.  I bought the 8 3/4"  f6 mirror and secondary for this telescope.   The focuser is a simple draw tube and collimation is by 3 bolts in the back of the mirror cell.

This was my first scope and was a great introduction to astronomy.  A 40 mm eyepiece gave fantastic views of the Orion nebula and Andromeda.   While a 9 mm eyepiece with a 2x Barlow ( when focused ) momentarily gave fantastic views of Jupiter and Saturn.  Dobson mounts are undoubtedly easy to make  but their lack of tracking really limits the telescope to lower magnifications.  I did make an equatorial platform for the scope but an increasing interest in astrophography meant a new home was needed for the optics; a telescope with a GEM.

 

 

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Copyright 2006 Steve Chambers. All Rights  Steve@pmdo.com

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