Cheap Educational Scope - Revision history

NebarnixWikiSysop at 00:45, 4 February 2014

2014-02-04T00:45:42Z

2014-02-03T14:13:05Z

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created terms section

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 ==Three Lenses?==
+[[Image:Three-Lens-Microscope-Prototype.jpg|thumb|right|Lens-Rail prototype of the three-lens version]]
 The two lens design does work, but suffers from a horrible defect in that most of the rays passing the first lens miss the tiny, distant ocular lens entirely. A third larger diameter and focal length 'field lens' can be added slightly more than one focal length away from the ocular to redirect rays back towards the ocular lens. Experiments with this additional third lens show great promise and image quality far above the simple two lens design.

← Older revision		Revision as of 14:13, 3 February 2014
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	2013 Jasper Nance KE7PHI		2013 Jasper Nance KE7PHI

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	<nowiki>*</nowiki> I don't believe in the word "its" unless referring to plural neuters.		<nowiki>*</nowiki> I don't believe in the word "its" unless referring to plural neuters.

← Older revision		Revision as of 14:12, 3 February 2014
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	2013 Jasper Nance KE7PHI		2013 Jasper Nance KE7PHI

−	<nowiki>*</nowiki> I don't believe in the word "its" unless ~~it refers~~ to plural neuters.	+	<nowiki>*</nowiki> I don't believe in the word "its" unless referring to plural neuters.

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 ==Three Lenses?==
- The two lens design does work, but suffers from a horrible defect in that most of the rays passing the first lens miss the tiny, distant ocular lens entirely. A third larger diameter and focal length 'field lens' can be added slightly more than one focal length away from the ocular to redirect rays back towards the ocular lens. Experiments with this additional third lens show great promise and image quality far above the simple two lens design.
+The two lens design does work, but suffers from a horrible defect in that most of the rays passing the first lens miss the tiny, distant ocular lens entirely. A third larger diameter and focal length 'field lens' can be added slightly more than one focal length away from the ocular to redirect rays back towards the ocular lens. Experiments with this additional third lens show great promise and image quality far above the simple two lens design.
 Jasper Nance KE7PHI
 <nowiki>*</nowiki> I don't believe in the word "its" unless it refers to plural neuters.

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 %axis auto;
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 </pre>
 Jasper Nance KE7PHI
 <nowiki>*</nowiki> I don't believe in the word "its" unless it refers to plural neuters.

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 Optical magnification and apparent magnification and perceptual magnification (I totally made up that term) are very different things.
-*'''Optical Magnification''' - The ratio of object to image.
+*'''Optical Magnification''' - The ratio of object magnitude to image magnitude. Makes more tangible sense for a real image.
 *'''Apparent Magnification''' - Takes into account the fact a detector will see angles, therefore, distances from the detector matter. This is the ratio of the angular size of the object placed at area of nearest focus (nearest distinct vision in humans, different for a camera) to the angular size of the virtual image at *it's distance.
 *'''Perceptual magnification''' (not an official term) - Same as apparent but uses the eye to object distance such that if you could put the instrument up to one eye and see it without the instrument through the other eye, '''even if the object is too close to focus on'''. Personally, this one makes the most sense.

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 Luckily I found some information on the human eye. Some of the really important ones are
 *'''Visual acuity''': 2 arcminutes
-*'''Distance of Nearest Distinct Vision''': 25cm (between this and infinity are good places to place your final virtual image)
+*'''Distance of Nearest Distinct Vision''': 25cm (between this and infinity are good places to place your final virtual image). This actually varies from about 5cm in youth to 1m in the elderly.
 *'''Visual acuity at the distance of nearest distinct vision''': 145µm (wow, my eyes are amazing!!)

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 Walmart! 33mm focal length lenses. Full lens diameter not usable, need to stop down with a 3mm stop.
-==The 2-lens Matlab Model==
+==Terms==
-Remember - Optical magnification and apparent magnification and perceptual magnification (I totally made up that term) are very different things.
+*Optical Magnification - The ratio of object to image.
-*Optical Magnification - The ratio of object to image.
+==The 2-lens Matlab Model==
 The following script is a work in progress. It produces the following figure which could be a lot better but its what I have right now.

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 *Distance of Nearest Distinct Vision: 25cm (between this and infinity are good places to place your final virtual image)
 *Translated visual acuity at the distance of nearest distinct vision: 145µm (wow, my eyes are amazing!!)
 ==The Cameras==