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GlennLeDrew
Pooh-Bah
Reged: 06/18/08
Posts: 1267
Loc: Ottawa, Ontario, Canada
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Another way to understand the issue... think of the field stops as having ground glass screens, like a camera viewfinder. As long as the image is properly positioned, it doesn't matter if the image comes from a not-too-large off-axis angle. Even if a screen is not present, the same applies. So it's not a matter of angles, but instead is a matter of position.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Home-made Mk II RA bino, using interchangeable objectives and eyepieces
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14728
Loc: Cumberland, R I , USA42N71.4W
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Quote:
At least one binoviewer company has provided an instruction sheet (can't seem to put my hands on it right now) that describes collimation for their binoviewer. It is done at the eyepiece tube, not at the prisms. Directions point to which screws on the eyepiece tube, caution which ones not to turn, describe which one to turn, and the method of adjusting the tube.
edz
Found it.
Baader Maxbright Binoviewer states:
eyepiece holders with diopter adjustment and LATERAL ADJUSTMENT provision. None of the low price binoculars has this feature – even though it is most important. Lateral adjustment of the eyepiece holders is the optical essential to beeing able at all to precisely collimate the viewer for high magnification work.
FWIW, I think Denkmeier has published a similar statement on collimating Denks, but just cannot find it.
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Arbacia
professor emeritus
Reged: 04/18/07
Posts: 696
Loc: Madrid, Spain
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Quote:
At least one binoviewer company has provided an instruction sheet (can't seem to put my hands on it right now) that describes collimation for their binoviewer. It is done at the eyepiece tube, not at the prisms. Directions point to which screws on the eyepiece tube, caution which ones not to turn, describe which one to turn, and the method of adjusting the tube.
http://www.alpineastro.com/Binoviewers/Maxbright%20Binoviewer%20Instructions.pdf
pag. 3 under "Fine Adjustments for Superposing (Merging) the Image"
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LightBridge 12", 70´s C8, C11. CGE. ETX125
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14728
Loc: Cumberland, R I , USA42N71.4W
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thank you. that's a good reference
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
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