Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens elements.

Started Dec 30, 2008 | Discussions
Micro32 Senior Member • Posts: 1,193
Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens elements.

This probably is what is causing the varied results people are getting from the new 50/1.4 G.

ruds Regular Member • Posts: 352
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

Have you got a link that we could look at? Its not that I don't believe you it would just make for a much better thread!

robind75 Regular Member • Posts: 153
isn't it rather recycled lamp bulb? (-nt-)
OP Micro32 Senior Member • Posts: 1,193
It's all in the Q&A! was Re: isn't it rather recycled lamp bulb?

I'm not sure how good light bulb glass is for making lenses out of, but I'm sure most CRTs have some really nice optical grade glass. The issue is recycling techniques and paying attention to detail is more important. I'm just concerned that Chinese Q&A isn't up to the Japanese when it comes to optics.

The new 50 is a great lens that is suffering from wide sample variations. When you get a good one you got a great one.

mayonaka Senior Member • Posts: 1,338
Re: It's all in the Q&A! was Re: isn't it rather recycled lamp bulb?

This is weird that they'd use recycled CRT's for the glass, but if it works, hey I'm ok with it. My 50mm 1.4 G seems to be doing great, so I can't complain. There may be a few lemons out there, but mine sure isn't. I'd like to see a reference to where this info is coming from though.
--
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D700, SB900, F6, F100, Tokina 19-35, Nikon 50mm AF-S G, Nikon 24-120mm VR.

Dejan Malikovski Senior Member • Posts: 1,611
Lamp glass will withstand torching the camera to remove dust!?

robind75 wrote:

georgeRC Contributing Member • Posts: 510
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

What is the source of this info? It sounds like wild imagination because the glass used in CRTs is not critically dependent on index of refraction or dispersion, but rather has high lead content to block bremsstahlung radiation. Using glass from CRTs would most likely mean the lens couldn't even begin to focus unless the shape of the lens surfaces were recomputed for each batch of salvaged glass. Are we really to believe that Nikon wouldn't notice or wouldn't care what was being done to their reputation?

This has all the earmarks of a story produced from emptying too many beer bottles too quickly. BTW isn't beer bottle glass cheaper than optical glass? Maybe you're onto something here after all. LOL

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ThomasMiller Senior Member • Posts: 2,735
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

I have a D700 made from Hemp. It's a special edition and smells great!

When I shoot people with it, I say "Okay, everyone say "Dude!"

OP Micro32 Senior Member • Posts: 1,193
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

georgeRC wrote:

What is the source of this info? It sounds like wild imagination
because the glass used in CRTs is not critically dependent on index
of refraction or dispersion, but rather has high lead content to
block bremsstahlung radiation.

This sounds just like the glass recipe that was used for the world famous and much sought after 28mm f/1.4D and 58mm f/1.2 Noct Nikkor. You can't tell me those two lenses are bad.

Bernard Languillier Veteran Member • Posts: 4,672
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

Micro32 wrote:

This sounds just like the glass recipe that was used for the world
famous and much sought after 28mm f/1.4D and 58mm f/1.2 Noct Nikkor.
You can't tell me those two lenses are bad.

For what it is worth, I saw a like new 28 f1.4 in a store in Tokyo yesterday at 420.000 Yen (nearly 5.000 US$)... I didn't bother checking whether it had been made from re-cycled beer bottles though.

Cheers,
Bernard

sidelight Senior Member • Posts: 1,013
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

From:

http://www.nikon.com/about/csr/report/2006/eco_e_08.pdf

Nikon began full-scale work on the development of lead- and
arsenic-free Eco-glass in 1995. We are employing this new glass in
all of our product categories that incorporate optical systems — IC
steppers, cameras, microscopes and so on. Nikon is working to
minimise the risk of environmental pollution (air, water, soil and
waste disposal sites) caused by optical glass containing lead and
arsenic, as far as possible throughout the entire product life cycle
(raw material production, manufacturing, use and disposal).

Since Nikon was established in 1917 as the first optical glass
manufacturer in Japan, we have placed a high priority on the
development and manufacture of optical glass designed for use in
optical equipment.

As part of our anti-pollution efforts, in the 1970s we ceased the use
of cadmium — a toxic material — in optical glass.
In the 1990s, we investigated countless optical glass compositions,
bearing in mind the possible effects of each on the environment.
Approximately 100 types of optical glass contained lead or arsenic. We
have recognised that this fact is one of the most significant
environmental aspects of our business activities and products.
Therefore, we decided to develop a new environmentally sound glass
and employ it in our products.

We demanded that the new glass offer optical performance at least
equalling that of the glass in use. As such, the optical glass development
department and the optical design department initiated a joint effort to
investigate a variety of new compositions and design factors. After
development was completed and the supply stance solidified, we began
introducing eco-glass into our products. Since fiscal 1999, we have used
the new glass across the board in our optical design department. From
the second half of fiscal 2005, we managed to use eco-glass in all
Imaging Company products, such as cameras.

The Nikon Group is undergoing a major shift to eco-glass at the
glass manufacturing departments of Nikon and Hikari Glass. During
fiscal 2006, we achieved an eco-glass utilisation rate of over 93% of all
glass shipped, at least 800t, including to non-affiliated companies.
Nikon offers an extensive range of optical equipment and, given
this diversity, some products incorporate parts that may not
accommodate Eco-glass. As far as technically possible, however, we
intend to switch over to the new material.

-- hide signature --

David

pluton Veteran Member • Posts: 3,463
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

Micro32 wrote:

This probably is what is causing the varied results people are
getting from the new 50/1.4 G.

-- hide signature --

Troll???-KB-

BRJR Forum Pro • Posts: 13,641
Good, For Nikon

Micro32:

And, unlike other manufacturers, Nikon can already make over two hundred types of its own glass for lenses:

http://support.nikontech.com/cgi-bin/nikonusa.cfg/php/enduser/std_adp.php?p_faqid=9893&p_created=1083168187&p_sid=ZWdiUdLi&p_accessibility=0&p_lva=9893&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MjEyJnBfcHJvZHM9MCZwX2NhdHM9MCZwX3B2PSZwX2N2PSZwX3NlYXJjaF90eXBlPWFuc3dlcnMuc2VhcmNoX25sJnBfcGFnZT0xJnBfc2VhcmNoX3RleHQ9ImxlbnMgIg**&p_li=&p_topview=1

-- hide signature --

BRJR ....(LOL, some of us are quite satisfied as Hobbyists ..)

Micro32 wrote:

This probably is what is causing the varied results people are
getting from the new 50/1.4 G.

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SoCalMan Regular Member • Posts: 297
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

Most Nikon lenses are now made in China from melamine. Unlike Canon lenses, they are painted with black lead paint. Be careful!

sidelight Senior Member • Posts: 1,013
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

SoCalMan wrote:

Most Nikon lenses are now made in China from melamine. Unlike Canon
lenses, they are painted with black lead paint. Be careful!

Yes, I think the OP was probably joking as well, but I was curious about what they are doing these days.
--
David

RicAllan Contributing Member • Posts: 795
Re: Wide Sample Variations! Nikon using glass from recycled CRT tubes for lens eleme

pluton wrote:

Micro32 wrote:

This probably is what is causing the varied results people are
getting from the new 50/1.4 G.

-- hide signature --

No, blithering idiot

Ric

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