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Here current pricing of optical glasses (Europe)

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#1 Schubert

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Posted 23 November 2013 - 07:01 AM

Dear all,

Have been busy designing a 155f9 triplet-apo akin to the early 90´s EDT-design by Christen.
This after having made an achromat-lens by the Remer-book.

Here are the current European prices for the blanks.
Maybe you would be interested.
Supplier is based in Wales.

ZKN7, unavailable from Schott
Replacement being: K4A (CDGM)
15mm thick, 160 dia: EUR 450 (1x), or 1875 (10x)
This glass has Bubble-problems.... (Grade B)

S-FPL53 (Ohara)
21mm thick, 160 dia: EUR 2125 (1x) or 12100 (10x)

25mm thick 160 dia blanks of standard glass
I requested these for grindingtools and flats
N-BK7 (Schott) EUR 410 (per 10x)
S-BSL7 (Ohara) EUR 275 (per 10x)
H-K9L (CDGM) EUR 245 (per 10x)

Regards
Schubert

#2 Schubert

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Posted 23 November 2013 - 07:05 AM

In short
Making a 1-off would cost me roughly EUR 3500 in glass alone for the lens-elements, tools and new flats.

Making 10 would cost me abt EUR 18500.

#3 Mark Harry

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Posted 23 November 2013 - 07:58 AM

So are you going to make 10??!!
M.

#4 Schubert

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Posted 23 November 2013 - 08:10 AM

Of course not,
My wife won´t let me :)

Just an ordinary guy with a strange hobby.
I´m not Yuri or Roland.

The supplier I think wanted to show that buying more would imply lower pricing. I only asked for the price of 1 blank, he sent me pricing of 1-offs and orders of 10. Very kind.

#5 Mike I. Jones  Happy Birthday!

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Posted 23 November 2013 - 08:24 AM

CDGM glass is notorious for poor homogeneity in large blanks, and is overall nasty stuff. Hate to see you resort to using it. The old Schott ZKN7 has been replaced with N-ZK7.

Have you tried:

Glass Fab

Schott Optical

Newport Glass

Naked Optics

I can't imagine there would be ITAR issues by selling you a single, nice H3 quality N-ZK7 blank.

Mike

#6 Schubert

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Posted 23 November 2013 - 09:37 AM

Thanks for the heads-up Mike.
I will ask if they can supply it, as it didn´t´show in their catalog.

Kind regards

#7 Mark Harry

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Posted 23 November 2013 - 10:35 AM

Hmm, I notice Naked Glass has Laf 7.....!!!
Nice link, Mikey!
M.

#8 Pinbout

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Posted 23 November 2013 - 06:47 PM

Hey mr.M. did you ever see this vid?

https://www.youtube....be_gdata_player

#9 Mark Harry

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Posted 24 November 2013 - 06:41 AM

Interesting. I'm rather suprised Roland said "lapping" is the same as "polishing" (!) They are completely distinct and separate from each other.
OTOH, the cuts I saw on his polishers are essentially the same as what I use.
***
(I suppose all this is another topic...)
M.

#10 Schubert

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Posted 24 November 2013 - 06:53 AM

It´s a beaufiful film I have seen a few times already, but nevertheless I stand in awe every time.

No hijack felt.

#11 wiseone

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Posted 24 November 2013 - 11:32 AM

Hi All,

I live about 4 miles from the 'supplier in Wales', and I know the people there very well indeed.

However, they are definitely not the cheapest for optical glass, though they have a good supply.

You may be better off looking at a German suppler, such as DoroTEK GmbH. Just Google them. I have dealt with them in the past, and they are pretty good on price.

Best of luck with the project.

#12 Schubert

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Posted 03 January 2014 - 03:54 PM

Thanks Mr Wise.
Will follow this one up.

#13 ed_turco

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Posted 03 January 2014 - 04:07 PM

There is no need to use optical glass for grinding tools. Regular plate glass is fine or even cheaper, you can make your own tools using plaster and nuts, or coinage for that matter.

Please! Save yourself a big hunk of money. For your own sake.

#14 Schubert

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Posted 07 January 2014 - 04:30 AM

Using plate to grind is simple and logical.
Getting a plate-glass tool the right size and thickness is about as expensive as the cheapest HK9L.
The glass is not the issue, the work costs money.

Making tools out of plaster and nuts only works for the concave surfaces. For convex using a solid glass tool is best in my opinion.

#15 ed_turco

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Posted 08 January 2014 - 03:41 PM

Excuse me but where did you read that plaster and nut tools were only for concave surfaces? While it may be true that you might have to start with a flat tool for a flat blank, you can still have the use of a very inexpensive tool.


Ed

#16 Pinbout

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Posted 08 January 2014 - 03:54 PM

Interesting. I'm rather suprised Roland said "lapping" is the same as "polishing" (!) They are completely distinct and separate from each other.
OTOH, the cuts I saw on his polishers are essentially the same as what I use.
***
(I suppose all this is another topic...)
M.



ah, just watched it again...his spherometers are balls... :p






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