> Date: Tue, 27 Jan 2009 09:59:41 -0700 > From: jon@intaglioeditions.com > Subject: Astronomy Pinhole Picture of the Day > To: alt-photo-process-l@usask.ca > > 6 month exposure. The photographer must have used a lead plate as an ND > filter. > > http://antwrp.gsfc.nasa.gov/apod/ap090115.html > Not likely. This is very easy to do and you do get some false color information using B&W photo paper as your "negative".