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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Binoculars
From: Brooke Clarke
Date: 2005 Apr 5, 22:07 -0700
From: Brooke Clarke
Date: 2005 Apr 5, 22:07 -0700
Hi:
I have some information about binoculars including a figure of merit based on how well you can hold them, see:
http://www.pacificsites.com/~brooke/Bino.shtml
Have Fun,
Brooke Clarke, N6GCE
Peter Fogg wrote:
I have some information about binoculars including a figure of merit based on how well you can hold them, see:
http://www.pacificsites.com/~brooke/Bino.shtml
Have Fun,
Brooke Clarke, N6GCE
-- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com
Peter Fogg wrote:
Perceived image sharpness is made up of resolution and contrast. The European tradition of fine lens making, from firms like Leica and Rodenstock and Schneider, has emphasized resolving power over contrast. There is a good reason for this; a low contrast image retains more information (tonal range) which is lost as the contrast is increased. Increasing the contrast is usually possible later on, eg, when reproducing the image on paper or in print, although transparency film is an exception here (a compensating factor is the higher contrast of transparency film over negative stock). The Japanese trend has been to go for higher contrast optics. This offers an increase in perceived sharpness. I don't want to imply that they are lacking in resolution as generally their overall quality is excellent. I too have been very impressed with some of the images offered by modern binoculars - not just Leica. Some do seem particularly crisp and bright. As always, if you're in the market shop around. The biggest problem with using binoculars seems to be holding the things steady, especially at sea, and so I've been intrigued by models with image stabilizers built-in, although they do seem to be expensive - and possibly more prone to damage from shock and salt air.From: Dan Allen I owned both a Leica R3 SLR and a Leica M2 rangefinder camera for several years. Both are works of art but optically they were actually not as good as my Canon or Nikon optics, at least in my opinion