Kit №I
The Dobsonian
NEWTONIAN REFLECTOR · 8-INCH · f/6
DEEP-SKY WORKHORSE
A big Newtonian tube slung in a plywood alt-azimuth box — the most aperture per dollar you can point at a galaxy.
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- 1Rocker box
- 2Focuser
Instrument record
- Optical design
- Newtonian reflector
- Aperture
- 8 in (203 mm)
- Focal ratio
- f/6 · 1200 mm
- Mount
- Alt-azimuth (Dobsonian)
At the eyepiece
John Dobson’s move was to drop the expensive equatorial mount and cradle a large mirror in a simple plywood box that swings on altitude bearings and turns on a lazy-Susan ground board, so the money buys aperture instead of gears. You nudge it by hand to follow the drift and re-collimate the primary mirror before a serious night, because every faint fuzzy you chase lives or dies on that light-gathering aperture.
Pairs with · ✦
The Planisphere
A Dob has no setting circles — you star-hop to every target, so plan the route on the wheel before you touch the tube.
Take it further
Read the deeper observing guides, size up gear in the field kit, or carry the notation as original merch in the shop.