Typically this unit is noted as arcseconds per pixel, like how in our gold miner analogy our sample rate was defined as feet between samples. If we think about the light from our scope landing on our sensor as a plot of land, we can also sample it at a particular rate across the dimension of space. The distance between our gold samples is the sampling rate. The point is that we can change how good the measurement is by changing how frequently we sample for gold. We could also check for gold every 10ft, for every inch, or for every nanometer. Let's say you decide to take more samples to get a better idea, and you sample a piece of dirt every 100ft in a grid across your plot, now you’re doing better. Obviously this won’t do very good at measuring the gold in the plot. Let's say you take a dirt sample at each corner of your plot. You want to survey the plot to see how much gold you have. For example, let's say you’re a gold miner who has a plot of land with an area of one square mile. A sampling rate is simply how many times you measure a signal over some dimension. In astrophotography (and many other fields of signal processing) there is an important term called the sampling rate. off-axis guiders, it's important to discuss some general knowledge about how autoguiding works. Autoguiding can allow for a system that takes trailed 2-minute long exposure to take exposures exceeding 30-minutes, so long as it is properly tuned and you make the correct decision about how you are going to autoguide.īefore we get into guide scopes vs. By doing so, you can correct for any kind of problems that may pop up while trying to perfectly track the sky, like polar alignment, periodic error, or wind gusts. Autoguiding is a method of active telescope control that makes your telescope ‘lock on’ to a particular star in the sky.
For most users, this will not be possible without some kind of autoguiding. In astrophotography, we want the sharpest long exposure images possible. Explore Scientific - Keys to the Universe Sale
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