From: "William Cook" <billcook50@___l.com>
Those interested in IS binoculars might be interested in a little article I wrote for the last issue of Nor'Westing magazine. It was certainly not a scholarly piece; but them, it wasn't written for scholars.
If anyone is interested, I will look up the issue and page number. I think it is still on the newstand.
See also: Gary Seronik, 'Image Stabilized Binoculars Aplenty'. Sky & Telescope, July 2000.
Canon has an IS model I hadn't heard of: 8 x 25 IS, list $460.
And Nikon's model is new to me: Nikon 14 x 40 Stabil-Eyes. 1700 list.
The face of the internal erecting prism shifts direction, thereby redirecting the light beam and stabilizing the image. When there is no vibration and the binoculars are parallel to the line connecting the viewer’s eye to the subject being viewed (a), the prism transmits the light straight through. When there is vibration and the binoculars are not properly aligned (b), as long as the prism is not moved the light beam will be transmitted to the viewer’s eye. This example illustrates rotation on the horizontal axis.
The StabilEyes prisms feature a gimbaled frame controlled by two piezoelectric sensors and two direct drive motors to ensure constant stability.
Subject: Fujinon Stabiscopes.
Last list, I wrote that there are glass, not electronic optics. Correction: the new Fujinon Stabiscopes are indeed image intensified.
While you're there, check out the 150mm models:
Fujinon released a new binocular “THECHNO-STABI TS1232” on October 1, 2002.
TS1232 has been developed as a handy version of TS1440.
1. Background We developed STABISCOPE for professionals and TECHNO-STABI TS1440 of commercial type for use on a vibrating platform such as a helicopter or a moving ship....new TS1232 for handy and low-cost binoculars with the same anti-vibration function, and compact size.....TS1232 can be marketed at about half the price of TECHNO-STABI TS1440.
The anti-vibration function of TS1232 controls the erecting prisms in the gimbaled frame by the direct drive motors through a microcomputer, and gives you rock steady images at quick response. The gimbal is a mechanism that holds prisms in it in the air so that the prisms may be moved free vertically or horizontally.
TS1232 has a waterproof structure ....newly adopted twist-up eye pad provided on the eyepiece section.....two AA dry batteries are used for easy portability. List Price in Japan:¥ 89,000
Subject: Re: Binocular List No. 252, lensatic prism elements
From: "Lucas, Gene" <gene.lucas@___ell.com>
In re: Bino List 252, the note from Stephen Sambrook and your comments, regarding "combined objectives and prisms", may I mention that in the 1970s (the late) Max Bray publically discussed the feasibility of making a small Maksutov-Newtonian corrector element, consisting of a prism with lens curves on two (or possibly three) faces, to be placed in the beam from the Newtonian primary mirror. This would facilitate making systems consisting of only spherical optics (including the primary). If properly made, the advantage would be that the prism corrector could be sold as an