Stars

Looking east from my front porch I see the stars rising in the evening. The atmospheric reflectivity recedes into a dull glow from tens of thousands of city street lights.  I have always been attracted to taking pictures in the dark. Stars are tricky, as they move. Long exposures create a smear of stars. When they arc in concentric circles through the photo, these have a pleasing effect, as they seem to show an order in the universe. But I prefer the reality of sharp points. Thus I must ask myself, what is the maximum exposure time I can take before the stars begin to move? How many pixels per second does the Earth rotate?

My calculations are as follows: 

  • A 24mm lens projecting onto a frame 36mm x 24mm has a horizontal field of view of 74˚.
  • The pixel array is 2900 x 4300.
  • Each pixel will thus be covering 61 arc/seconds of space.
  • The earth rotates 360˚ in 86,164 seconds. 
  • 360˚ is 1,296,000 arc seconds. 
  • A pixels worth of rotation will take 4 seconds. 

And so in order to have a tack sharp photo with my relatively wide angle lens, I cannot expose the sensor for more then 4 seconds. That is comforting to me.

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Opening week

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Picnic has opened! It's been a great week. Me and Jen have made friends with Pierre and Annebelle at Pulehu Pizza and Jeff at Cameron Books. Also, our old buddy from Green Castle, Elloy, is running his Taco Yucateco cart in the lot. Customers from last year, and even 2 years ago!! have returned for more lunchtime goodness. Meagan Kennedy wrote an amazing piece about the cart complete with some great photos.

Right now it's Sunday and I'm reading some magazines and cookbooks. Jonathan Waxman has some good ideas for tasty sandwiches: avocado and crab; wilted greens, garlic, and chevre; eggplant, peppers, and pesto. Also my friend Sarah has strongly advised me to look into her favorite sandwich: avocado, salsa, and gruyere.

Farmers market