The enormous light-gathering power
of Subaru Telescope's 8.
The aperture (diameter) of the primary lens or mirror in your telescope determines two things: the light-gathering power
(light grasp) of the instrument and its resolving power--the ability to see fine detail in an image.
Most telescopes have poor optics because people in the past were interested only in total light-gathering power
when they built large [telescopes]," says Kenneth J.
When light waves reaching the two scopes are combined wave for wave, the pair has the light-gathering power
of a single 11.
While binoculars can show some of these things, you really need the greater light-gathering power
and magnification of a telescope.
According to the most recent plans, the NNTT would be a square array of 8-meter mirrors that could work together to simulate the light-gathering power
and resolution of a single 16-meter mirror or could work separately (SN: 1/3/87, p.
In order to use the maximum light-gathering power
of a 6-inch telescope, you shouldn't use a magnification less that 22x, producing an exit pupil 7 mm across (the maximum most eyes can accept).
For some people it means getting a telescope with a larger lens (in the case of a refractor) or mirror (reflector), which offers greater light-gathering power
and the ability to see fainter objects.
8-meter mirrors of the MMThave the total light-gathering power
of a single mirror of 4.
Although Jerry's giant Astroscan lacks the compact size and portability of the original 4Vs-inch Edmund scope, it delivers nearly four times the light-gathering power
thanks to its 8-inch f/4.
So are the planners of the National New Technology Telescope, which is projected to be a multiple-mirror arrangement with a light-gathering power
equivalent to a 15-meter single mirror.
Thankfully, the extra magnification and light-gathering power
of my 15x70s make the task considerably easier.