Timeline for How far are space-walking helmet faceplates from the eyes? How far will I have to hold my "space binoculars" from my eyes during a space walk?
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
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| Aug 4, 2021 at 2:10 | vote | accept | uhoh | ||
| Aug 3, 2021 at 16:18 | answer | added | blobbymcblobby | timeline score: 4 | |
| Aug 3, 2021 at 2:22 | history | edited | uhoh | CC BY-SA 4.0 |
edited title
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| Mar 23, 2021 at 15:46 | answer | added | DrSheldon | timeline score: 0 | |
| Mar 23, 2021 at 0:25 | history | edited | uhoh | CC BY-SA 4.0 |
added 546 characters in body
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| Mar 23, 2021 at 0:10 | history | edited | uhoh | CC BY-SA 4.0 |
added 106 characters in body
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| Mar 23, 2021 at 0:01 | comment | added | uhoh | @DrSheldon I have added two screenshot and links to their videos that might elaborate somewhat on this. Thanks for your interest! | |
| Mar 23, 2021 at 0:00 | history | edited | uhoh | CC BY-SA 4.0 |
I've added more information about exit pupil spacing since there have been questions in comments and answers have missed the point of the quesiton
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| Mar 22, 2021 at 23:48 | comment | added | uhoh | @DrSheldon Title asks for distance between binoculars and eyes. Usually we hold binoculars very close to, or in contact with the face to help hold them steady; the ones I mention in the question have little extendable spacers to hold them so that the exit pupil (18 mm beyond the eyepiece proper) can be placed at the eye's entrance pupil. If you wear glasses, you retract those spacers as much as you like in order to rest the binoculars on the front of your glasses.) If you have a helmet, it imposes a much larger distance between eyepieces and eyes. Question wants to know how much more that is. | |
| Mar 22, 2021 at 23:42 | comment | added | DrSheldon | I'm trying to understand which distance this question is asking for: the typical eye to helmet surface distance, helmet surface to telescope distance, or eye to telescope distance? | |
| Mar 22, 2021 at 15:42 | answer | added | Carl Witthoft | timeline score: 1 | |
| Mar 21, 2021 at 9:35 | comment | added | uhoh | @ikrase if you have an example of a gas mask with the same distance from eyes to external surface of the transparent surface as an astronaut helmet, and a pair of binoculars that work at that distance, then you have an answer! But I think that once you start measuring things you'll see that a quantitative comparison breaks down. | |
| Mar 21, 2021 at 9:22 | comment | added | ikrase | It seems to work OK for military and industrial gas masks. | |
| Mar 21, 2021 at 5:20 | comment | added | uhoh | @ikrase glass up close to face might get more steamy though, so I've just asked Why don't astronaut helmets fog up? What's the chemistry and thermodynamics behind keeping the field of view clear even during heavy breathing? | |
| Mar 21, 2021 at 4:49 | comment | added | ikrase | Another possibility is less bulbous helmets. | |
| Mar 21, 2021 at 2:06 | comment | added | uhoh | @ikrase that's why I said "These are going to be pretty crazy looking binoculars!" I think this field is ripe for some interesting alternative technology. The first step is to establish just how crazy/awkward/huge normal eyepieces would be, and to do that we need to figure out how far away the faceplate puts anything outside it from the user's eyes. | |
| Mar 21, 2021 at 1:57 | comment | added | uhoh | @ikrase hunting for a dim comet in a field full of stars at night may be a different task though. Find me one with a 50° apparent angular field of view and a 15 cm relief and I'll find you an eyepiece that is so huge that it's impossible to put another one next to it in order to make a pair of binoculars! Remember I've "stepped outside" to explore and enjoy the heavens, not to be a marksman (at least on this particular spacewalk). | |
| Mar 21, 2021 at 1:50 | comment | added | ikrase | I'm pretty sure gun sights normally have large eye relief, so | |
| Mar 21, 2021 at 1:48 | answer | added | Taha Attari | timeline score: 3 | |
| Mar 20, 2021 at 13:22 | history | asked | uhoh | CC BY-SA 4.0 |