Designing a Keplerian Telescope with 7X Magnification & 5mm Exit Pupil

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SUMMARY

The discussion focuses on designing a Keplerian telescope featuring 7X magnification, a 5mm exit pupil, and a minimum of 10mm eye relief. The user has identified two lenses: one with a 35mm focal length and another with a 5mm focal length, achieving the desired magnification and exit pupil. The primary challenge lies in calculating the eye relief for this afocal system, which requires understanding the relationship between the focal lengths and the positioning of the lenses.

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  • Understanding of optical lens systems
  • Knowledge of Keplerian telescope design principles
  • Familiarity with magnification and exit pupil calculations
  • Basic concepts of eye relief in optical systems
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  • Explore the impact of lens spacing on eye relief
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UrbanXrisis
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i am to design a keplerian telescope with 7X magnification, 5mm exit pupil, and at least 10mm eye relief.

I have one lens with focal length 35mm, another with focal length 5mm, giving a visual mag of 7X and the exit puiple is 5mm, but how do I account for the 10mm eye relief?
 
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basically, the thing I don't understand is how do I calcuate eye relief for an afocal system?
 

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