Confusion at the Border: Photography Versus Astronomy

One of the biggest confusions that you might notice as you venture into astrophotography is that photographers and astronomers measure their equipment differently. Photographers tend to refer to their lenses in terms of their focal length, while astronomers refer to their telescopes by the diameter of their opening. Thus, a 75mm f/6 telescope has a focal length of 450mm. Meanwhile, a 75mm camera lens at f/6 has an aperture of 12.5mm. If a photographer is told that someone is shooting a 155mm lens hand-held, it would not raise an eyebrow, but an astronomer told the same thing would be incredulous! I can only barely lift my 155mm telescope onto its mount!

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The Nikon Coolpix B600: Everything You Need to Know About the Camera Market In One Camera

Nikon quietly — or maybe not so quietly given the press — announced the demise of the innocuously named Coolpix B600, a product name that just trips off the tongue and screams cheap and cheerful. What is startling about this camera is that it only hit the market in December 2020. Some eight months later it has bitten the dust. Why is this and what does it say about the camera market?

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