The Celestron C90 Maksutov Cassegrain Telescope
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William Optics Zenithstar 71ED and Twilight I M...
Feb 28 2015 07:53 AM by Ahab
If you want to Master your craft, read Lessons...
Jan 07 2015 08:29 AM by AstroDad
Celestron Ultima 80
Dec 16 2014 02:54 PM by Gianluca67
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Fishing for Photons Archives
Every tool has constraints on how best to use it. This helps us understand a bit more about those built into the Canon DSLRs.
The QHY10 gives you the size of a typical DSLR sensor, but in a package that gives you a full 16-bits worth of data (vs. 12 or 14 bits), regulated cooling (down to -45C below ambient), very clean electronics, and comes in a package that won’t tax your focuser and is well-suited for Hyperstar imaging. What’s not to like?
I designed PHD Guiding to be as simple as "Push Here Dummy". When everything works, it's great (and quite often that's the case!). But, what do you do when it doesn't work?
The first thing on the docket is the notion that the Nyquist Theorem (and its sampling limit) applies only to things like one-dimensional audio streams and does not apply to things like
We're returning to the issue of signal-to-noise in this installment a bit, but it'll take us a chunk of the column to get there directly. The topic in this round is image sampling and what I want to impress upon readers is that there is a tradeoff here.
We're going to take a bit of a break from the series on SNR and explore another side of astrophotography. It's a side that many inclined to think of this as purely technical or as being entirely scientific have can have a tougher time with
Believe it or not, you can get very accurate measurements on your camera with only a minimum of hardware, skills, and time
In this installment, we'll talk about the fundamental unit of our image – the pixel. While it may seem like a pretty low bar to set here, understanding the pixel is
Before we dive into the meat of things here with the first real entry, it's probably worth spending a bit of time introducing myself and introducing this column
You've probably heard it before and if you continue to read my columns here, you'll hear it a hundred more times -- astrophotography is all about signal-to-noise ratios (SNR). But, what does that mean and can such a blanket statement be true?