#optics

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Delta Sierra @notthatdelta@furry.engineer · Jul 20, 2026
Okay, *this* is a cool piece of kit! Soviet-era nightvision scope, redistributed via Harbor Freight of all places circa 1997-2000. It's pretty old tech, but just needed a fresh 9V battery and it seems to be working (tried it in a dark closet, waiting on it to get dark outside to try it there too). It comes with an IR illuminator (not pictured) but sadly the AA batteries in the illuminator exploded so I'll have to do some cleaning and possibly repair there. I have some other cool hardware from this batch that I'll post in the coming days but this one definitely caught my eye. I don't know much about these other than to have realistic expectations about the image quality and to never use in bright conditions; I'd welcome feedback/insight. #vintage #vintageElectronics #NightVision #optics
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Steelwire Jones @steve_schryer@mstdn.ca · Jul 16, 2026
The word polarization means something like "poles," and it implies that there are "two" opposites, like north pole and south pole. Yet, when scientists say that light is polarized, they mean that it vibrates in one single plan. Today, I stumbled upon an old text, where the polarization of light stands for the two opposites: "brightness and darkness." In my opinion, because of that imprecision, the ancient meaning of light polarization has been occulted. Thus, instead of saying "polarized" light, we should rather say "linearized" light. #physics #optics
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Steelwire Jones @steve_schryer@mstdn.ca · Jul 16, 2026
The word polarization means something like "poles," and it implies that there are "two" opposites, like north pole and south pole. Yet, when scientists that light is polarized, they mean that it vibrates in one single plan. Today, I stumbled upon an old text, where the polarization of light stands for the two opposites: "brightness and darkness." #physics #optics Thus, in my opinion, we should say polarized light, but rather linearized light.
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j_bertolotti @j_bertolotti@mathstodon.xyz · Jul 09, 2026
Tempted to start making posts about how #Optics, #Light, absorption etc work, aimed at people doing #MiniaturePainting . Mostly I am not doing it because I suspect I would come around as obnoxious instead of useful.
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Santiago 🔭🪐 @santiago@mastodon.uy · Jun 10, 2025
Bueno, estuve haciendo algunos star test en el telescopio nuevo y para mi sorpresa, se trata de un excelente lente, prácticamente sin aberraciones o por lo menos del orden de lambda/10 P-V lo cual significa que el prácticamente perfecto. El star test consiste en tomar una estrella brillante y tomar imagenes enfocada y desenfocada unas 4 ondas (que en mi caso son unos 3.9mm lo que hice con algo de incertidumbre) intra y extra focal y examinar el patrón de difracción de anillos. Las imágenes deberían ser en una óptica ideal, exactamente iguales. Nunca es el caso con ópticas reales y hasta los objetivos más caros suelen no pasar la prueba 100%. La intensidad de los anillos concéntricos revela una suavidad muy grande de la superficie o smoothness. Además de la ausencia de astigmatismo, coma y practicamente de aberración esférica. La aberración esférica es el terror de los telescopios refractores acromáticos y también apocromáticos, debido a que de las aberraciones primarias, es la única que es proporcional al inverso de la distancia focal al cubo, por lo que objetivos de corta distancia focal suelen no controlarla muy bien. En mi star test se observa algo de aberración esférica subcorregida muy mínima, del orden de lambda/10 común en las ópticas premium. La MTF del lente es prácticamente la teórica y el strehl ratio es del orden de 0.97 - 0.98 lo cual es inmejorable para un objetivo acromático Fraunhofer clásico, incluso comparable a un apocromático. El programa WinRoddier francés, estima un error P-V de lambda/12 y un error RMS de lambda/82 lo cual me parece un poco mucho, pero ta. Eventualmente voy a repetir el star test en mejores condiciones y con los desenfoques precisamente simétricos. Le envié el test que hice al fabricante del telescopio para manifestarle que es excelente el diseño y que cumplió con lo que el dice en la página, y me contestó invitandome a poner el test en su página, lo cual para mi sería un honor. Que pena que no se pueda vivir de esto. Como mensaje final para los fanáticos de los apocromáticos (y como de cada cosa que hago, elijo emprender una causa, en este caso, por los acromáticos largos oldschool), sepan que un acromático de estos le pisa los talones si no anda mejor en lo referente a resolución, ya que al controlar tan bien la aberración esférica originada en las 4 superficies esféricas del duplete, posiblemente resulte menor que en los objetivos apocromáticos que tienen 6 superficies esféricas con las que lidiar. Además, la tolerancia a los errores superficiales en el caso de los apocromáticos, es unas 10 veces menor que en un duplete, por lo que los apos, tienen que estar muy pero muy bien figurados para no contaminar la imagen con el clásico halo de luz parásita proveniente de la esférica a grandes magnificaciones, lo que de paso explica, porqué los acromáticos son invencibles en resolver estrellas dobles. Tengo una máquina de resolver dobles, efectivamente. Síganme para más tips sobre testeo de lentes y espejos de telescopios. #fraunhofer #doublet #telescope #telescopio #acromatico #achromat #kasai #japan #optica #optics #fisica #physics #diffraction #difraccion
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China Business Forum @cnbusinessforum@mstdn.business · May 09, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · May 06, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · May 05, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Apr 22, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Apr 18, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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Santiago 🔭🪐 @santiago@mastodon.uy · Apr 09, 2026
Replying to @santiago@mastodon.uy
Este otro lo vi hace un tiempo, sobre la fábrica de los telescopios Vixen, mamita querida... https://www.youtube.com/watch?v=_263B0-yXas #telescopios #telescope #astronomy #optics #vixen
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China Business Forum @cnbusinessforum@mstdn.business · Apr 06, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Apr 02, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Mar 31, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Mar 28, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Mar 03, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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China Business Forum @cnbusinessforum@mstdn.business · Feb 24, 2026
[#TRADESHOW] #China #Wenzhou #International #Optics #Fair 2026 will be held from May 8 to May 10, 2026, at Wenzhou International #Convention & #Exhibition #Center. As a must-attend #B2B #optical #trade #event, the #show serves as a #strategic #sourcing #platform connecting #global #buyers with China’s leading #eyewear #manufacturers and #OEM/ODM #suppliers. The #expo #highlights mid-to-high-end eyewear #manufacturing, #innovation, and international trade expansion. https://cnbusinessforum.com/event/china-wenzhou-international-optics-fair-2026/
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