[ATM] small diameter, long F.L.
halbertmusik at aol.com
halbertmusik at aol.com
Sat Nov 1 18:36:51 JST 2008
Thanks for all of the fast replies-
Of course have been watching Surplushed.com, they just did not have what I wanted - this time... But this lens is not an achro, just a simple... I did find a lens by Melles Griot but for c. $120 which is a bit pricey for what I have in mind.
The lens design looks good to me, makes me think - -
By the way, whyare we not supposed to discuss design?
William David Halbert
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Thema: ATM Digest, Vol 59, Issue 1
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oday's Topics:
1. Project 10^100 (Michael Lindner)
2. Re: Project 10^100 (Thomas Janstrom)
3. Re: Project 10^100 (Thomas A. Moulton)
4. Re: Small diameter, long F.L. (Richard in the UK)
5. Re: Small diameter, long F.L. (Richard F.L.R. Snashall)
6. Re: Project 10^100 (Michael Lindner)
7. Re: casting update (waldo kitty)
8. Re: ATM: Why are my messages being censured to Horace r
Davis? (waldo kitty)
9. Re: bvc glass (Scott Ewart)
---------------------------------------------------------------------
Message: 1
ate: Thu, 30 Oct 2008 23:45:23 -0400
rom: Michael Lindner <mikell at optonline.net>
ubject: [ATM] Project 10^100
o: DIST - ATM List <atm at atmlist.net>
essage-ID: <490A7F53.6090207 at optonline.net>
ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
Google is sponsoring a contest called Project 10^100. The goal is to
elp as many people as possible. There are several categories, including
ducation. Perhaps some list members would like to invest some energy
nto how we could do an ATM project to educate people about optics
nd/or astronomy, and perhaps win a prize. It could be something like an
nternet enabled telescope (I know that's been done before, but hey,
t'd be fun).
I found out our own Thomas Moulton has entered with a project on solar
nergy, which is quite a cool idea. Go and check it out at
ttp://www.gothim.com/solarsled.html.
So, let's brainstorm some ideas to use our talents, and let's support
ur fellow list members in this endeavor.
Clear skies.
-
ichael Lindner
ttp://www.starastronomy.org *** http://home.att.net/~mikel
ttp://www.atmsite.org *** http://www.atmlist.net
-----------------------------
Message: 2
ate: Fri, 31 Oct 2008 15:55:23 +1000
rom: "Thomas Janstrom" <thomas at moiler.com>
ubject: Re: [ATM] Project 10^100
o: "'DIST - ATM List'" <atm at atmlist.net>
essage-ID: <00a601c93b1d$4595def0$d0c19cd0$@com>
ontent-Type: text/plain; charset="us-ascii"
Mike, I'll chuck in a 5.5" minor axis cellular secondary blank, if someone
an grind and figure it. To save on postage etc. I believe that James
ulherin has one of my prototypes kicking around (he was to do some testing
n it, but as far as I know never got the time: James, don't worry, no hard
eelings!).
So if he can find it, it's free for the asking for such a project.
I'll contact James personally to see if he can track down the errant piece
f Pyrex.
Cheers, Thomas Janstrom.
ittle Gems.
ww.tjlittlegems.com
-----Original Message-----
rom: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
ichael Lindner
ent: Friday, 31 October 2008 1:45 PM
o: DIST - ATM List
ubject: [ATM] Project 10^100
Google is sponsoring a contest called Project 10^100. The goal is to
elp as many people as possible. There are several categories, including
ducation. Perhaps some list members would like to invest some energy
nto how we could do an ATM project to educate people about optics
nd/or astronomy, and perhaps win a prize. It could be something like an
nternet enabled telescope (I know that's been done before, but hey,
t'd be fun).
I found out our own Thomas Moulton has entered with a project on solar
nergy, which is quite a cool idea. Go and check it out at
ttp://www.gothim.com/solarsled.html.
So, let's brainstorm some ideas to use our talents, and let's support
ur fellow list members in this endeavor.
Clear skies.
-
ichael Lindner
ttp://www.starastronomy.org *** http://home.att.net/~mikel
ttp://www.atmsite.org *** http://www.atmlist.net
______________________________________________
TM mailing list http://www.atmlist.net/
------------------------------
Message: 3
ate: Fri, 31 Oct 2008 06:34:52 -0400
rom: "Thomas A. Moulton" <tom at moulton.us>
ubject: Re: [ATM] Project 10^100
o: Michael Lindner <mikell at optonline.net>
c: DIST - ATM List <atm at atmlist.net>
essage-ID: <490ADF4C.7020508 at moulton.us>
ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks Mike.
The deadline to submit new ideas was on Oct 20th.
The purpose of the webpage is to get people to get people to join my
ailing list
or become myspace.facebook freind) so I can contact then when voting
tarts.
Voting is only 1 week long)
So I would like to encourage everyone to check out my idea
http://www.gothim.com/solarsled.html )
and* register with me http://www.gothim.com/register.html
I also have an email that I send out, if you want something you can
orward to Your friends, just ask me.
Oh yes, Solar SLED - a way to monitor the performance of each Solar
anel in a solar array with the
bility to watch for under performing panels that may need cleaning or
ther maintenance.
tom
Michael Lindner wrote:
Google is sponsoring a contest called Project 10^100. The goal is to
help as many people as possible. There are several categories, including
education. Perhaps some list members would like to invest some energy
into how we could do an ATM project to educate people about optics
and/or astronomy, and perhaps win a prize. It could be something like an
internet enabled telescope (I know that's been done before, but hey,
it'd be fun).
I found out our own Thomas Moulton has entered with a project on solar
energy, which is quite a cool idea. Go and check it out at
http://www.gothim.com/solarsled.html.
So, let's brainstorm some ideas to use our talents, and let's support
our fellow list members in this endeavor.
Clear skies.
-----------------------------
Message: 4
ate: Fri, 31 Oct 2008 13:11:49 +0000
rom: Richard in the UK <richard at foucault.co.uk>
ubject: Re: [ATM] Small diameter, long F.L.
o: "Richard F.L.R. Snashall" <atm at atmlist.net>
essage-ID: <95597068.20081031131149 at foucault.co.uk>
ontent-Type: text/plain; charset=us-ascii
Hello Richard,
Thursday, October 30, 2008, 12:51:26 PM, you wrote:
> Their website lists the diameter as 50.8 mm,
I suspected as much, but did not look for their website.
By the way Richard, about 80% of your emails are dropping in my spam
rap and I have no idea why.
--
est regards,
Richard in the UK
------------------------------
Message: 5
ate: Fri, 31 Oct 2008 10:25:08 -0500
rom: "Richard F.L.R. Snashall" <rflrs at rcn.com>
ubject: Re: [ATM] Small diameter, long F.L.
o: ATM List <atm at atmlist.net>
essage-ID: <490B2354.30701 at rcn.com>
ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
Richard in the UK wrote:
I think you have your work cut out finding a direct replacement. If
you want to have a go at making your own you could try :
Surf Radius Thickness Glass Diameter
OBJ Infinity Infinity 0
STO 677.7159 8.5 N-BK7 42
2 -401.7602 7.5 SF2 42
3 -1232.815 0 42
4 Infinity 1034.873 42
nteresting. I had just found a solution to a
early [green] aplanat with the minimal inter-lens
pacing (that could then be set to zero). Then, I
ooked at this problem from a different perspective.
f the lens were designed for green aplanatism, what
ould the color correction be for a given glass
ombination. The closest I could come to canonical
C correction (with the first lens being BK7) was:
42 mm f/24.8 Doublet
S: 0.9681 to 0.9291 at 0.150 mm shift
Surf Radius Thickness Glass Diameter
OBJ Infinity Infinity 0
STO Infinity -0.3484371 42
2 633 4.2 N-BK7 46
3 -464.5 3 N-SF5 46
4 -1401.5 1038.282 46
IMA -339.58 42
At about f/18 or so (I didn't check too hard.), the
C crossover is within the aperture. About half
hat, the crossover is at the 70% point.
Oops! I forgot... we weren't supposed to discuss
esign here.
-----------------------------
Message: 6
ate: Fri, 31 Oct 2008 15:28:55 -0400
rom: Michael Lindner <mikell at optonline.net>
ubject: Re: [ATM] Project 10^100
o: thomas at moiler.com
c: 'DIST - ATM List' <atm at atmlist.net>
essage-ID: <490B5C77.7040800 at optonline.net>
ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
Thomas Janstrom wrote:
Mike, I'll chuck in a 5.5" minor axis cellular secondary blank, if someone
can grind and figure it. To save on postage etc. I believe that James
Mulherin has one of my prototypes kicking around (he was to do some testing
on it, but as far as I know never got the time: James, don't worry, no hard
feelings!).
So if he can find it, it's free for the asking for such a project.
Thanks!
Well, I didn't do my homework - the submission date for 10^100 projects
s past. That doesn't mean we can't still come up with some great ideas
n our own (or for next year)!
Clear skies.
-
ichael Lindner
ttp://www.starastronomy.org *** http://home.att.net/~mikel
ttp://www.atmsite.org *** http://www.atmlist.net
-----------------------------
Message: 7
ate: Fri, 31 Oct 2008 16:51:57 -0500
rom: waldo kitty <wkitty42 at windstream.net>
ubject: Re: [ATM] casting update
o: horace r davis <hrd9 at juno.com>
c: atm at atmlist.net
essage-ID: <490B7DFD.80601 at windstream.net>
ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
horace r davis wrote:
Have air bubbles in mirror blank. Will re melt the glass hold longer time
at 2100 F and do to the mold I will remove the kiln shelf and put the
mold on post to get heat under the bottom of the mirror blank It appears
the kiln shelf keep the blank from heating in the center of the mirror
from the bottom up and just heated from the top, trapping air in side the
glass. Two days left on run will power wash blank then melt it will take
another 9 days to complete the next run.
are the bubbles really going to make any difference or are you just looking for
"perfect" pour?
FWIW: you may not be able to get those bubbles to rise out without some sort of
ssistance... that assistance could be vibratory or it is possible that you need
to heat your material more so that it has a lower viscosity and the bubbles can
ise on out...
--
OTE: NEW EMAIL ADDRESS!!
_\/
(@@) Waldo Kitty, Waldo's Place USA
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irus Database (VPS): 081031-0, 10/31/2008
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Message: 8
ate: Fri, 31 Oct 2008 16:57:44 -0500
rom: waldo kitty <wkitty42 at windstream.net>
ubject: Re: [ATM] ATM: Why are my messages being censured to Horace r
Davis?
o: DLZ-130 <stainless_steel at suddenlink.net>
c: ATM list <atm at atmlist.net>
essage-ID: <490B7F58.7090805 at windstream.net>
ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
DLZ-130 wrote:
Why are my messages not getting through to Horace R. Davis, my friend, and
fellow amatures, lately?
they are making it into the list as far as i can tell... i saw your original to
orace about possibly needing to stir his glass pour to get the bubbles out...
hen i saw what appeared to be a report from some web style interface which
onfused me because you used the term "email program"...
--
OTE: NEW EMAIL ADDRESS!!
_\/
(@@) Waldo Kitty, Waldo's Place USA
_ooO_( )_Ooo_____________________ telnet://bbs.wpusa.dynip.com
|_____|_____|_____|_____|_____|_____ http://www.wpusa.dynip.com
___|_____|_____|_____|_____|_____|____ ftp://ftp.wpusa.dynip.com
|_Eat_SPAM_to_email_me!_YUM!__|_____ wkitty42 -at- windstream.net
--
vast! Antivirus: Outbound message clean.
irus Database (VPS): 081031-0, 10/31/2008
ested on: 10/31/08 17:57:45
vast! - copyright (c) 1988-2008 ALWIL Software.
ttp://www.avast.com
------------------------------
Message: 9
ate: Fri, 31 Oct 2008 21:06:15 -0400
rom: "Scott Ewart" <scotte12 at gmail.com>
ubject: Re: [ATM] bvc glass
o: <atm at atmlist.net>
essage-ID: <012c01c93bbe$0aa48930$1fed9b90$@com>
ontent-Type: text/plain; charset="US-ASCII"
http://www.ajstelescopeworkshop.ca/
----Original Message-----
rom: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
orace r davis
ent: Thursday, October 30, 2008 10:15 PM
o: atm at atmlist.net
ubject: [ATM] bvc glass
am looking for the suppler of bvc mirror blanks lost there web address
fter my computer failed.
___________________________________________________________
lick here to find the perfect picture with our powerful photo search
eatures.
ttp://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3mDcGfugN6tk06l0GczKBObrzW
MZryyM7FgDS3XrKASRJVa/
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