02 // DIMENSIONS & CALCULATIONS & DESIGNING
Chapter 01-A // Dimensions & Calculations
The image shown below is the most essential and the easiest calculation that one has to look for while building a newtonian reflector telescope.
FIG 1.1: Optical Layout and the necessary calculation to make your life easy.
Ref: How to build your own telescope by Richard berry
In our case, for the distance between the diagonal mirror and the primary mirror, we did not strictly adhere to the +1", rather we subtracted it i.e., our final equation looked like F-T-H-1". This was done because of the focuser size. The calculation looks like
F = Focal Length = 900mm
T = Tube inner dia = 95mm
H = Height of focuser = 96mm
So, F-T-H-25 = 900 - 95 - 96 - 25 = 684mm
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