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Frodo - a 10 inch travel Dobson

10 inch, f/4.8 newtonian

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features!

numbers

basic considerations

 

optics
hogging out
smoothing the curve
polishing
foucault tester
figuring
silvering

 

mechanics
mirror cell
wire spider
focuser
middle ring
rocker box

 

travel and assembly

performance

acknowledgements

 

 

 

features!

   
- air travel and couch potato compatible - small dimensions, yet full viewing comfort

 

- rotating OTA - always a comfortable viewing position (yes, I’m going on forty…)

 

- wire spider plus secondary heating - lord of the strings, if the seeing is bad yet again, I can play the lyra instead…

 

- self made 2 inch Crayford focuser - the ATM equivalent of the ugly stick

 

- 6 point wood/aluminium mirror cell with roller skate bearing pivots for reduced stiction (was "glued aluminium cell) - it did not work out

 

- independent two axis collimation of main mirror and secondary - collimation for the intellectually challenged

 

- “true” Serrurier truss configuration – don’t I love over-engineering…

 

 
     

 

   © 2005 by Andreas Derwahl •  contact