I thought I'd do another little advertisment for my equipment and holiday. The lens used in this 30 second shot covers from Scorpius to Polaris! This view was from the plinth at AstroPalma looking across to the astrotrak and remote dome. I hired the f/2.8 Sigma 4.5mm 180 degree fish eye from lenses for hire, and it JUST (or maybe not?) focused with my modified Canon EOS1000D. The trouble with modifying a camera is that the removal of glass makes a tiny difference to the focus. Fortunately most lenses focus a bit beyond infinity, but with this one the tiny TINY focal length made the focus point crucial and it only just made it to focus with the ring at full turn. Phew! It is impossible to use live view at night with this lens - no star is bright enough and Jupiter wasn't risen from behind the mountain. I had to find a street light in this dark sky location. Fancy that, wanting light pollution? Mad.
Showing posts with label Sigma. Show all posts
Showing posts with label Sigma. Show all posts
Sunday, 10 July 2011
Amazing place, amazing lens
I thought I'd do another little advertisment for my equipment and holiday. The lens used in this 30 second shot covers from Scorpius to Polaris! This view was from the plinth at AstroPalma looking across to the astrotrak and remote dome. I hired the f/2.8 Sigma 4.5mm 180 degree fish eye from lenses for hire, and it JUST (or maybe not?) focused with my modified Canon EOS1000D. The trouble with modifying a camera is that the removal of glass makes a tiny difference to the focus. Fortunately most lenses focus a bit beyond infinity, but with this one the tiny TINY focal length made the focus point crucial and it only just made it to focus with the ring at full turn. Phew! It is impossible to use live view at night with this lens - no star is bright enough and Jupiter wasn't risen from behind the mountain. I had to find a street light in this dark sky location. Fancy that, wanting light pollution? Mad.
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