Extension for a Golf Range Finder

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Discussion Overview

The discussion centers around the design and functionality of a golf range finder, specifically exploring how to extend its usability through the addition of a tube that allows for viewing the display from a greater distance. The conversation touches on concepts from geometrical optics and the practical implications of modifying optical devices.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about the purpose of viewing the range finder display from a distance and suggest using a cellphone camera to capture the image through the device's exit pupil.
  • It is noted that the concept of "eye relief" is crucial in determining how far away one can be from the device while still seeing the display clearly.
  • One participant proposes using two lenses within the tube: one to capture the range finder image and send parallel rays down the tube, and another to refocus those rays into a viewable image.
  • Another participant challenges the idea of parallel rays being maintained throughout the system, emphasizing that while telescopes can produce parallel rays at the output, this is not the case in the middle of the system.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and design of the optical system, with some agreeing on the need for lenses while others contest the specifics of how those lenses would function together. The discussion remains unresolved regarding the optimal design approach.

Contextual Notes

There are limitations in the discussion regarding assumptions about lens properties, the specific requirements for the optical system, and the implications of using different focal lengths. The conversation does not resolve these technical details.

polocouch
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TL;DR
Hi guys, I have a golf range finder, I want to add a tube to the eye Port of said range finder and be able to view what I can view while my eye is directly against said port. Can anyone help me out here ? How is this possible?
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Welcome to PF.

So you want to be able to see the same display when your eye is a few cm away from the device? Can you say why? Have you tried holding your cellphone camera lens in the exit pupil of that device yet? You may be able to just make a simple holder for your phone to be able to see it on your phone display

https://en.wikipedia.org/wiki/Exit_pupil...
 
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In the world of geometrical optics, this is called "eye relief". If you exceed that distance you will have to build a telescope, not just a tube.
 
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berkeman said:
Welcome to PF.

So you want to be able to see the same display when your eye is a few cm away from the device? Can you say why? Have you tried holding your cellphone camera lens in the exit pupil of that device yet? You may be able to just make a simple holder for your phone to be able to see it on your phone display

https://en.wikipedia.org/wiki/Exit_pupil...
I want to make the range finder seem much larger than it is, like a gag but I need the ability to see it through a longer tube. Not a truly functional reason
 
DaveE said:
In the world of geometrical optics, this is called "eye relief". If you exceed that distance you will have to build a telescope, not just a tube.
Thank you, I understand it can’t just be a tube I know there has to be a way to do it thanks that’s why I’m asking
 
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Two lenses inside that tube:
One to grab the rangefinder image and send parallel rays down the tube.
One to refocus those parallel rays to form a viewable image.

If the first lens has a long focal length and the second lense a short focal length, you have a telescope (or microscope, depending on their spacing).

Equal focal lengths give you an image relay system, keeping the image the same size.

(OK, been decades since I've done this stuff so corrections are encouraged!)

Cheers,
Tom
 
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Tom.G said:
One to grab the rangefinder image and send parallel rays down the tube.
One to refocus those parallel rays to form a viewable image.
Nope. Parallel into means parallel out of a telescope, but not in the middle*. It's kind of the definition of these things.

1703233782318.png

Figure 3.15 (a) A Galilean telescope. (b) A Keplerian telescope.

https://www.routledgehandbooks.com/doi/10.1201/9781315373034-4

*although I suppose you could call a tube with no lenses a telescope with magnification of 1 and parallel rays everywhere.
 
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