Hi y'all
I am wondering if a "half-drum lens" is suitable for creating a larger version of a stanhope lens from back in the day:
http://doriclenses.com/optical-components/ball-lenses-derivatives/1017-ball-and-drum-lenses.html
or
https://www.knightoptical.com/stock...snir-optics/lenses/drum-and-half-drum-lenses/
For lens calculation I have been looking at: http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/priplan.html
To understand how long the length of the lens would need to be in relation to the diameter, but im pretty lost on the math here. I understand that either h1 or h2 need to be 0.
From what I understand and have been told here in the forum a stanhope was an elongated plano convex lens where it focused on its own plane surface aka, the flat end. I intend to put a microimage on the flat end.
Would someone be able to make a recommendation for a scaleable length of the lens (if I wanted to create a larger stanhope opposed to the originals which were 3x7mm) and how to determine how large the image could be at the focal plane in the center?
Aberrations:
I've read the image on stanhopes themselves do not cover the entirety of the flat end but only the middle due to aberrations.
I've also been told that adding a groove diaphragm to the lens would restrict the aperture therefore having less aberration, but im not sure a half drum lens exists with one if not custom, unless a coddington which also don't seem to be readily available in the modern day (?) Or a elongated doublet lens?
I am wondering if a "half-drum lens" is suitable for creating a larger version of a stanhope lens from back in the day:
http://doriclenses.com/optical-components/ball-lenses-derivatives/1017-ball-and-drum-lenses.html
or
https://www.knightoptical.com/stock...snir-optics/lenses/drum-and-half-drum-lenses/
For lens calculation I have been looking at: http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/priplan.html
To understand how long the length of the lens would need to be in relation to the diameter, but im pretty lost on the math here. I understand that either h1 or h2 need to be 0.
From what I understand and have been told here in the forum a stanhope was an elongated plano convex lens where it focused on its own plane surface aka, the flat end. I intend to put a microimage on the flat end.
Would someone be able to make a recommendation for a scaleable length of the lens (if I wanted to create a larger stanhope opposed to the originals which were 3x7mm) and how to determine how large the image could be at the focal plane in the center?
Aberrations:
I've read the image on stanhopes themselves do not cover the entirety of the flat end but only the middle due to aberrations.
I've also been told that adding a groove diaphragm to the lens would restrict the aperture therefore having less aberration, but im not sure a half drum lens exists with one if not custom, unless a coddington which also don't seem to be readily available in the modern day (?) Or a elongated doublet lens?
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