Allen Versfeld's picture

Repairing a Lens

"Canon EF 50 mm f 1.8 II" by Justus Blümer from Deutschland - Canon EF 50mm f 1:1.8 II ObjektivUploaded by Common Good. Licensed under CC BY 2.0 via Wikimedia Commons - of my favourite tools for astrophotography is the Canon EF 50mm F/1.8 lens which I use for wide field deep sky images. It's the single cheapest lens on the market, as evidenced by its all-plastic construction and the scratchy grinding noise made by its autofocus motor. But it's also fast, small and light, and it performs way above its price range. It's the perfect accessory for an astronomer on a budget, like me. Unfortunately, kids and photography gear don't mix, as I found one day when I came home one day to find it broken on the floor.

Allen Versfeld's picture

Carnival of Space #400

Carnival of SpaceWelcome to the 400th Carnival of Space!  We're running a day late, thanks to the Easter Weekend, but there's a bumper crop of astronomy and space science news and articles to make up for it, so let's dive straight in.

Allen Versfeld's picture

Are we really headed for a collision with Andromeda?

The Andromeda Galaxy.  Image credit: NASA/JPL/California Institute of TechnologyDear Urban Astronomer

I recently read that the andromeda system is our closest neighbour. Apparently, our galaxy is on a crash course with the andromeda system. They make it sound like its going to happen in the next few decades. I was just curious how much bigger is andromeda? How close is it to us? And how close are we to impact. Thanks in advance,


Dear Drew

First thing first, we are indeed on a collision course with the Andromeda Galaxy, but we've got rather more than just a few decades to get our affairs in order, so I wouldn't worry too much just yet.<--break->


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