I have the 500 Centon, and its pretty soft even without a convertor. With 2* or 3*, not only would you never be able to focus accurately, but the image would be poor anyway.
> -----Original Message----- > From: James Adams [mailto:[EMAIL PROTECTED]] > Sent: 09 May 2002 20:47 > To: [EMAIL PROTECTED] > Subject: Re: For reading the wall clock on the International Space > Station > > > Christian, > With my Centon fixed f8 500mm mirror lens, I have used mostly > Fuji 800ASA or > 400ASA, since the results I got with 100ASA and 200ASA were > poor. I also use > a Vivitar 300mm f5.5-f22, Vivitar 400mm f6.3-f22. As my > eyesight is not so > good, I think I need some sort of diopter correction or 3x > magnifier to help > me focus. I may revisit lower speed films, and see what happens. > > The closest I can get to the BE's nest, is 120 feet, as the > closer I get the > higher the angle, and the less I can see of the subject. There is an > embankment 200 Yds behind me where I took some shots with a > 2x converter, > but it was too far away. I've got a 3x Vivitar converter but > that would give > me f22 with the Centon, f16 with the 300mm and somewhere > between for the > 400mm lens. > James > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
