WebApr 26, 2013 · Cemented Doublet. It became foggy in patches between the lenses, tried everything to get them apart, from soaking in solvents to baking in a self cleaning oven at about 800 degrees. The cement used didn't budge. I cannot tell you how much I loved that scope. You probably think I am a Sct guy by my posts but my first scope was a refractor, … http://waywiser.fas.harvard.edu/objects/19861/25inch-cemented-doublet-lens?ctx=4b2fea36-8428-4312-a22f-186d294d6051&idx=4
Cemented Achromatic Doublets - Thorlabs
Doublets can be air-spaced, cemented, or "oiled". Oiled doublets hold the optical fluid in place with surface tension alone. Elements may be cemented by oil or a soft cement in the case when the differential thermal expansion of crown and flint glasses causes hard or cured cements to warp or fracture. See more In optics, a doublet is a type of lens made up of two simple lenses paired together. Such an arrangement allows more optical surfaces, thicknesses, and formulations, especially as the space between lenses may be considered … See more Doublets can come in many forms, though most commercial doublets are achromats, which are optimized to reduce chromatic aberration while also reducing spherical aberration and … See more • Achromatic lens • Triplet lens See more Lenses may be cemented together for any of several reasons: 1. To eliminate the reflection losses of two air-glass surface interfaces. 2. To prevent total reflection at … See more WebCemented doublets are often built using a process called Floater Air Bearing Assembly, which involves using one element as the mechanical reference and aligning the other … decking products
Tutorial 3: Technical drawings – Knowledgebase
WebOct 3, 2007 · Unfortunately, the haze is on the inside of one of the cemented doublet pairs. It must be that this was poorly cleaned - and someone poured water directly onto the lens, where it found a gap in the cement between the doublet. Is there any way to remove the haze other than cutting through the paste and taking the two lenses apart? WebFor example, if one component of the doublet is n=1.8 and the cement is n=1.5, the reflection from the glass/cement interface will be nearly 1%. If this is unacceptable, an AR coating will need to be designed that is optimized for … WebDec 13, 2024 · The 4MOST Wide Field Corrector and Atmospheric Dispersion Corrector (ADC) lenses have been manufactured and tested at KiwiStar Optics, New Zealand. The … february 2022 kpop comebacks