The front curves of a minus aspheric lens get steeper toward the lens edge, which flatter the
Aspheric lens have a flatter curve
It help reduce edge thickness.
賣咗十年眼鏡，您問我答（4）
羅嚴克拉姆殿下
1001 回覆
10 Like
9 Dislike
第 1 頁第 2 頁第 3 頁第 4 頁第 5 頁第 6 頁第 7 頁第 8 頁第 9 頁第 10 頁第 11 頁第 12 頁第 13 頁第 14 頁第 15 頁第 16 頁第 17 頁第 18 頁第 19 頁第 20 頁第 21 頁第 22 頁第 23 頁第 24 頁第 25 頁第 26 頁第 27 頁第 28 頁第 29 頁第 30 頁第 31 頁第 32 頁第 33 頁第 34 頁第 35 頁第 36 頁第 37 頁第 38 頁第 39 頁第 40 頁第 41 頁
咁都有得嘈
討論下啫
By Darryl meister
其中一個我覺得最勁optics 既人
可惜走得早
The geometry of an aspheric surface also prohibits the practice of grinding prism for decentration. However, prescribed prism can still be ground. Aspheric surfaces have a specific reference point— the axis of symmetry—which spherical surfaces do not. When prism is ground in an aspheric lens to decenter the optical center, the optical center is moved away from this reference point—which is typically located at the geometric center of the lens. Therefore, grinding prism to decenter the optical center (or decentering the optical center to induce prism) is not recommended in many cases.
Since the geometry of an aspheric surface can reduce the thickness of a lens, it becomes possible to use asphericity strictly for cosmetic purposes. By producing a highly-aspherical surface with a rapid change in curvature towards the periphery of the lens, the sag of the surface can be made much shallower. When asphericity is ‘exaggerated’ in this fashion, the off-axis optics are generally poor—since the lens has been optimized solely for cosmetics, with little regard for optics. Most modern aspheric lenses are designed to provide good optical performance, nonetheless.
其中一個我覺得最勁optics 既人
可惜走得早
The geometry of an aspheric surface also prohibits the practice of grinding prism for decentration. However, prescribed prism can still be ground. Aspheric surfaces have a specific reference point— the axis of symmetry—which spherical surfaces do not. When prism is ground in an aspheric lens to decenter the optical center, the optical center is moved away from this reference point—which is typically located at the geometric center of the lens. Therefore, grinding prism to decenter the optical center (or decentering the optical center to induce prism) is not recommended in many cases.
Since the geometry of an aspheric surface can reduce the thickness of a lens, it becomes possible to use asphericity strictly for cosmetic purposes. By producing a highly-aspherical surface with a rapid change in curvature towards the periphery of the lens, the sag of the surface can be made much shallower. When asphericity is ‘exaggerated’ in this fashion, the off-axis optics are generally poor—since the lens has been optimized solely for cosmetics, with little regard for optics. Most modern aspheric lenses are designed to provide good optical performance, nonetheless.
依視路1.61 大概幾錢？
3百零廢數，一百散光
係咪用開覺得ok
想問下雙非球面鏡，人地望你，個輪廓線係咪唔會變形?我525度用1.67非球，框size50，係鏡片邊緣會見到輪廓凹左入去
雙非球面變型修正一流
相機用非球面都差好遠
雙非有冇平野介紹，500係咪1.6 1.67都得?
1.6 有隻好野
仲可以加藍光
點解鼻托位成日損
早兩年戴都無事 係今年先有
戴緊Oakley
防滑鼻托是矽膠，對佢敏就會咁
正啊矽膠
防跣
去optical image 問有隻1.61 非球面做緊$580
好似叫咩ilens? 想問有冇伏？
好似叫咩ilens? 想問有冇伏？
去optical image 問有隻1.61 非球面做緊$580
好似叫咩ilens? 想問有冇伏？
估計無牌子
正常價
左眼 525度 425度散光
右眼 700度 425度散光
鏡片防藍光
鏡片埋單1300有冇伏
右眼 700度 425度散光
鏡片防藍光
鏡片埋單1300有冇伏
左眼 525度 425度散光
右眼 700度 425度散光
鏡片防藍光
鏡片埋單1300有冇伏
可以啦
正路
左眼 525度 425度散光
右眼 700度 425度散光
鏡片防藍光
鏡片埋單1300有冇伏
可以啦
正路
1.67？
左眼 525度 425度散光
右眼 700度 425度散光
鏡片防藍光
鏡片埋單1300有冇伏
可以啦
正路
1.67？
係
Btw 個sales 用藍光照落去鏡片真係隔左9成咁濟
牌子係gialens
左眼 525度 425度散光
右眼 700度 425度散光
鏡片防藍光
鏡片埋單1300有冇伏
可以啦
正路
1.67？
係
Btw 個sales 用藍光照落去鏡片真係隔左9成咁濟
牌子係gialens
正路價
去optical image 問有隻1.61 非球面做緊$580
好似叫咩ilens? 想問有冇伏？
估計無牌子
正常價
巴打有冇咩牌子鏡片推介？ 1.61依視路要千幾？
想配返副Rayban
邊到有會平啲？
定其實間間都差唔多價？
求其去間亮視點配就得？
邊到有會平啲？
定其實間間都差唔多價？
求其去間亮視點配就得？
想配返副Rayban
邊到有會平啲？
定其實間間都差唔多價？
求其去間亮視點配就得？
其實行貨既都同亮視點母公司攞
睇下間鋪賺幾多出街咁解
你近我可pm我
我在大西北或銅鑼灣都有計
去optical image 問有隻1.61 非球面做緊$580
好似叫咩ilens? 想問有冇伏？
估計無牌子
正常價
巴打有冇咩牌子鏡片推介？ 1.61依視路要千幾？
差唔多錢用Hoya Nikon seiko吧
想配返副Rayban
邊到有會平啲？
定其實間間都差唔多價？
求其去間亮視點配就得？
其實行貨既都同亮視點母公司攞
睇下間鋪賺幾多出街咁解
你近我可pm我
我在大西北或銅鑼灣都有計
我見亮視點啲款多數1500到
其實係咪淨係計個框？
銅鑼灣有鋪頭介紹？
會平到幾多？
如果我100至200度計埋鏡片幾錢到？
防藍光又加錢？
Sorry完全唔熟眼鏡
想配返副Rayban
邊到有會平啲？
定其實間間都差唔多價？
求其去間亮視點配就得？
其實行貨既都同亮視點母公司攞
睇下間鋪賺幾多出街咁解
你近我可pm我
我在大西北或銅鑼灣都有計
我見亮視點啲款多數1500到
其實係咪淨係計個框？
銅鑼灣有鋪頭介紹？
會平到幾多？
如果我100至200度計埋鏡片幾錢到？
防藍光又加錢？
Sorry完全唔熟眼鏡
Pm吧
唔想搞到好似找生意post
點解鼻托位成日損
早兩年戴都無事 係今年先有
戴緊Oakley
防滑鼻托是矽膠，對佢敏就會咁
正啊矽膠
防跣
我自己就好唔鐘意果種「啜」嘅感覺.....
見到視光師巴打quote 上面果d光學嘢，我都好想同d師弟師妹講
上堂學嘅嘢無分有無用，而係您識唔識用，正如放大率，呢d上堂一定有學，而客人其實都有興趣知多d, 與其比人潛移默化覺得浪費咗幾年，點解去追求吓「無用之用」，將自己由一個ordinary salesperson 變成一個合格稱職的optician呢？
上堂學嘅嘢無分有無用，而係您識唔識用，正如放大率，呢d上堂一定有學，而客人其實都有興趣知多d, 與其比人潛移默化覺得浪費咗幾年，點解去追求吓「無用之用」，將自己由一個ordinary salesperson 變成一個合格稱職的optician呢？