查看完整版本: Roland Christen 谈论的AP镜头抛光

Roland Christen 谈论的AP镜头抛光

[list][i]"All polishing including hand correction is always done on a machine. Steep curves are no worse to polish to high accuracy than shallow ones. In fact, very shallow curves are the most difficult to get right. For an apo triplet, every surface must be matched to a very high tolerance level to an interferometric test plate. Only if this is done will the spherical and color correction come out right. Apo doublets have slightly lower requirements, and achromats have much looser tolerance for color correction than a triplet lens." [/i][/list][list][i]There are many ways to polish a glass surface, and the oft used words "machine polished" really means very little. There is no-one in this business that pushes glass around by hand. There is a vast difference between precision polishing and rapid polishing of a surface. Rapid polishing can clear a ground surface is 10 minutes or less. Some new processes can do it even faster - a few seconds for a 6" part. The surface will not be very good in either case, and will have machining marks and zones on a microscopic level. Precision polishing takes many hours with specially made pitch laps. That's the only way to get consistent high surface finish."[/i]
j(jJ }'a.L,H*C!R A — Roland Christen @jK][

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s3M0Pw9C+TXB [[i] 本帖最后由 siqingtan 于 2008-8-17 19:19 编辑 [/i]]

[font=楷体_GB2312][size=4][color=black]估计这是AP产量低下的主要原因之一，抛光全是先机械粗磨后老爷子自己利用[i]specially made pitch laps花费数小时[/i]细磨修正使镜头达到表面一定精度
bj j/Q#g U 不知机械是否真的象他说的那样难以满足必要的精度，不知别的厂家是否也是如此？？[/color][/size][/font]CXbO g L|

_+tZ)@ G)KB4O-`1yr [[i] 本帖最后由 siqingtan 于 2008-8-18 18:23 编辑 [/i]]

AP镜头感觉比较薄，相对较轻?C#k3G?S"F
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[[i] 本帖最后由 siqingtan 于 2008-8-18 18:36 编辑 [/i]]

我还以为要磨几天呢，原来才几个小时。。。磨一下，10美刀。
MK)s.IR4M
`s}dG.|#h [[i] 本帖最后由 fancysky 于 2008-8-18 22:01 编辑 [/i]]

磨一下有可能不贵， 但是真正的宽带镀膜就很昂贵了。bbbb28

如果都是球面，调好机器是可以将球面磨得很镜确的。不要手工的。 _];{1w%C9Jhx0@
如果用了非球面（消除高级像差），要用手工了。

[quote]原帖由 [i]wbhifi[/i] 于 2008-8-19 06:48 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=67462&ptid=6799][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url]
"J@6M(~I&KMw"] 磨一下有可能不贵， 但是真正的宽带镀膜就很昂贵了。bbbb28 [/quote]*M5S
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;oQ`(f*rI0H^6U 真正的宽带膜其实也不贵的.[ Y!d9a.aC{?Yh
另外,现在的球面抛光,用好的机器,调整好后,基本不需要手修.

看看这个最新回复，可以了解不少关于AP的情况，尤其是最新的一些产品/Qo e.OM
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'V[Zvyc1De "Marj and I were just up in your neck of the woods last week. We visited Nova
$}G,md:l Scotia where I landed as an immigrant from Europe in 1953. It was quite Sc+aqc+R0HV
interesting to walk again on the pier where I came ashore so many years ago.
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As far as how these scopes are made: The 130F6.3 is an oiled triplet
*d+X ~-DIO1E3i Y objective using FPL53 as the middle element surrounded by two high quality crown:mat}z7T
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elements. The lenses are polished and hand corrected by myself using time,^z?4`'B8K
honored
1e ?&Cq,C7RO methods of pitch laps and polishing slurry. I've been doing this for more than
strTuDV]2f:I$g 30 years. Every lens ever sold by Astro-Physics has gone through my hands this
P!~5tl:_qleQh same way. The lenses are tested to a rigorous standard using a modern
R&e,\6AuS interferometer setup to test the spherical correction, as well as an
AgUy"EM6I*e autocollimator/O6g}I q2R
for testing the color correction. I also assemble every scope, although I leave
5l j%Px(]Bk1S it to my machinist craftsmen to make and finish the mechanical components.
#mI/z0w6K/r These scopes are not made in commercial quantities, rather they are handS |MF+yIo2J
crafted. If we ever sell a commercially made lens or scope, we will state this
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b._ \%m N.Z P.V G clearly in our advertising.”|8xi~'DofM
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Rolando

Rolando确实很敬业啊bbbb46

53年来美国的移民，也是外来户啊。P,jJ/B$^0K
从他夫人的名字（辅音当元音用）和他自己的姓氏来看，我猜他会不会是荷兰裔的？

LZ是不是铁了心要等APbbbb67

[quote]原帖由 [i]fancysky[/i] 于 2008-9-14 07:57 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=71449&ptid=6799][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url]
:B"tf!vu 53年来美国的移民，也是外来户啊。\.Zf(b:D
从他夫人的名字（辅音当元音用）和他自己的姓氏来看，我猜他会不会是荷兰裔的？ [/quote]*z{&qa5l7j

S&y0uv[,l`zq 不，是德國裔的

那要是老头子不在了怎么办？

梦想中的望远镜～～
?#w8Y P5Y2f l AP140做做梦吧～～

AP155的油头"B3p]*y#g;wV
[attach]13683[/attach]

bbbb45 镜座拆了才知道原来三片有这么厚。

还好了， LZOS做的更厚 bbbb45

确实够厚，为何不做的轻薄些呢，从用料来讲，可以节省很多那些昂贵的玻璃。这个厚度确实有些出乎意料。

搞不懂是怎么注油进去的。

80年代初一篇Sky and Telescope有他写的文章，那时才刚开创APO折射镜。
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B@S#RI,x+\3x 玻璃之间的曲率一样，注甘油进去的目的是赶走空气，以及完全消灭四个玻璃与空气的接口，亦由于甘油与玻璃的折射率相近，效果是可免除了镜头内侧四个玻璃面的精细修正工作，最后的镜头就如Mono目镜一样。
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注甘油量其实很少，不如说是油膜，总用量应该连几份一毫升也没有。

看过了 可以说是长见识了

[font=Georgia][size=2]The result of heating an oiled lens with a hot air dryer[/size][/font] ^mETs;t9c6i
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[attach]15275[/attach]

[quote]原帖由 [i]fancysky[/i] 于 2008-9-15 18:22 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=71623&ptid=6799][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url]
r`V?&b(e M~Z+HK 确实够厚，为何不做的轻薄些呢，从用料来讲，可以节省很多那些昂贵的玻璃。这个厚度确实有些出乎意料。 [/quote]|C0Rg].e\

%ZHT d+XU bbbb10 这要考滤内应力变形,温差,机械误差,稳定型很多方面的,老毛子的头虽然厚,可是在很多恶劣条件下表现不俗bbbb81 ...

[quote]原帖由 [i]sunglasses[/i] 于 2008-9-14 20:20 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=71505&ptid=6799][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url]1Sq/H2w9GW I9o
那要是老头子不在了怎么办？ [/quote]}%i8fg~
太经典了...bbbb3

[quote]原帖由 [i]siqingtan[/i] 于 2008-11-12 18:40 发表 [url=http://www.astroview.com.cn/redirect.php?goto=findpost&pid=79862&ptid=6799][img]http://www.astroview.com.cn/images/common/back.gif[/img][/url])a)[7V f(m
The result of heating an oiled lens with a hot air dryer RA`0Q6Z*BW1Co
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15275 [/quote]*{IT"Ds
那要是用冷风吹呢？？？？