There are field reducers that will bring an f/10 down to an f/6 or better. This sounds great cause it shortens the time of an exposure but there has to be a down side to this. What do you lose? What is the down side? how far should i take my f/10 down?
2007-03-11 04:07:40 · 2 answers · asked by kramo 1 in Science & Mathematics ➔ Astronomy & Space
The direct optical tradeoff is that you are trading image scale for brightness and field of view. You wouldn't want to use a reducer for planets or other very small objects because the image will be smaller. On the other hand, this is actually an advantage for many objects.
The most significant undesirable side effect , in SCTs at least, is vignetting. Your f/10 telescope is designed to accommodate a narrow cone of light, and asking it to provide a wider field of view can result in the outer portions of the image getting less light than the center.
2007-03-11 06:04:10 · answer #1 · answered by injanier 7 · 0⤊ 0⤋
i would say that i dont agree with your therory of reducing of time by field reducer (or i may have miss understood the question) because it only affects the lines of the field of light that you are seeing
+++and so it will increase chances of accuracy of waching a thing
--- but it will also make you loose time to locate a perticular thing as it will reduce the size from wher light comes in
2007-03-11 11:29:28 · answer #2 · answered by coolsober 2 · 0⤊ 0⤋