Hi Doug Cool didn't know all of this. I don't think an eclipse last as long as five minutes though (at least not the total part) Also don't think I would be able to handle a 2000mm to do it justice. JCO must be using one hellva tripod to get those shots of his.
Any idea, assuming I use fuji100, of what the exposure time would be on a for eg f/4.0? Feroze ----- Original Message ----- From: "Doug Franklin" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, November 03, 2002 10:22 PM Subject: Re: Eclipse > Hi Feroze, > > Remember, the sun and moon both move about 0.25 degrees per minute > through the sky. Here are some representative long lens angle of view > numbers: > > 4.1 deg SMCP-A* 600mm f/5.6 ED (IF) > 4.1 deg SMCP-FA* 600 f/4.0 ED (IF) > 2.1 deg SMCP-A* 1200mm f/8.0 ED (IF) > > So, let's postulate that at 2000mm you're looking at an angle of view > of around > > aov = 2.1 * (1200/2000) = 1.26 > > So in five minutes either one will completely cross the frame on the > diagonal. In reality, you want to keep it closer to the center of the > frame, so you're looking at adjusting your "aim" every minute or two. > > TTYL, DougF KG4LMZ > > >
