A couple of people have written asking about the image adorning the top of my home page. To be honest, I picked it without really giving the nature of its appeal a lot of thought — I just liked it. But by way of answering an e-mail, I’ve decided that what it comes down to, at least to my eye, is the magic of twilight.
Continue reading “About That Picture”
Build this simple device for steady binocular views of the night sky.
I love binocular astronomy. At least, that’s my excuse for cluttering the house with a dozen (at last count) of these double-barreled optical wonders. Recently, my collection expanded to include particularly heavy 10×50s and inexpensive 15×70s. For the first time I really felt that I needed some kind of binocular support.
Continue reading “Gary’s Easy-Go-Round Binocular Mount”
Choosing binoculars is easy once you understand the specs.
Shopping for binoculars at your local camera store or on-line can be a bewildering experience. And if stargazing is your goal, the task becomes even more confusing — there are so many factors to consider and so many (often contradictory) opinions about what matters and what doesn’t. Fortunately, once you understand some of the basic specifications, figuring out whether or not a given binocular is going to suit your needs becomes a lot easier.
Continue reading “Binoculars By The Numbers”
Too big, too small, or just right? Making sure your reflector’s secondary mirror is the correct size is a straightforward task.
The Newtonian reflector has many strengths, not the least of which is that it consists of just two elements: a precisely shaped paraboloidal primary mirror and a flat diagonal secondary mirror. Yet for all its intrinsic simplicity, confusion abounds when it comes to the optimum size of the diagonal. Many amateurs, and apparently even some telescope manufacturers, seem unsure as to how to choose the correct size for the diagonal. So how big should it be? That depends on several design parameters and some personal preferences.
Continue reading “Sizing Up the Newtonian Secondary”