This article is divided into four parts, in which it is fully shows the shared discussion forum from 20 February 2014 to a 9 June 2014, with the glorious completely manual realization by “Massimar” a mirror Newton diameter 300mm focal ratio F 3,8 with excellent quality of given surface from peak / valley asperities
This article is divided into four parts, in which it is fully shows the shared discussion forum from 20 February 2014 to a 9 June 2014, with the glorious completely manual realization by “Massimar”, a mirror Newton diameter 300mm focal ratio F 3,8 with excellent quality of given surface from peak / valley asperities
SOLIDITY’ = PREROGATIVE ESSENTIAL OF LATTICE The need for unity in the transportability of Dobson telescopes (characterized by a reduced frame ingeniously essentials despite the large aperture of the primary mirror Newton) has meant that the optical tube of such instruments, must obviously having a larger diameter for just contents the big primary mirror, It could be replaced
Is’ born in 1939 and it serves to measure with extreme precision (impossible to Foucault test for reasons which we shall see here later looking at the title: REASONS WHY THE FOUCAULT TEST IS INACCURATE FOR LOW FOCALS RATIOS MIRRORS)) the radii of curvature of the zones of a parabolic mirror, or even more deformed figure from, a very short focal ratio (that is more inferior to F5) and a beyond the diameter 300 or
PART FOUR AND LAST: NOTE: Clicking on the images You gets his magnification, often helpful to appreciate the details that are in practice the object of this work. Today is the 7 March 2009 START I start polishing the amateur work abandoned 4 February for "paid" business reasons . Resume in hand then the mirror whose
PART THREE, of FOUR: 5 February 2009 PREPARATION OF POLISHING TOOL : Returning to practice to cover the tool with "candy squares of pitch", to be pasted on the same, with simple local and light softening one facet of the squares with a candle flame,, and then fixed in position on the glass with a little thumb pressure;, You may want to read my article with various photographs on this
SECOND PART, of FOUR: The February 2 start polishing abrasive 320 medium grain size 30 microns. The reference text indicated in the first part to the point (2) Realize your telescope di e Karine Jean-Marc Lecleire; to their page 152 says that the grain 240 (…abrasive corundum) need 3 hours and 15 of
PART ONE, of FOUR: This work is made transcript (I hope) readable, relative to notes taken in pencil in my “"grattavetro" Diary” during the construction of the mirror installed in my lightweight Travel Dobsonian Telescope, in photography. Notes that are usually taken, for myself, as with the passage
Micro travel Dobson 130 F7 size "A4" ( year 2008 )
The obvious question that arises is: “What's is the point..or the "sense"” to build a micro dobson like this? The sense is just that… That such a small instrument and light and without a tripod, allows you to observe when walking up hill or mountains, or on other occasions, when You can't take anything bulky as a classic little telescope
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