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Identifying Glass Types for a Doublet

(19)
Thanks Richard and everyone for your guidance. My good friend used Atmos to design a 4" f/12 using FPL51 and it looks absolutely stunning. I had no idea a
Peter
19
posts
12:22 PM

3D filter howto

(6)
Hi Paul, You are very correct in this. For passive 3D the projector(s) and viewers both need polarizers and the screen needs to be silver to maintain the
Peter
6
posts
Jun 30

18" thin mirror

(18)
Many thanks for the explanation Paul, especially that on Twyman stress. I guess for someone that is picking up the threads after a 50 year absense there is
walking_david
18
posts
Jun 28

Laser collimator

(12)
hi Velinoff, a few things to consider: misalignment of the laser apparently is not one of these. The wrong shape ( =coma) of the mirror is not likely - i have
nilsolof.carlin@telia.com
12
posts
Jun 24

new member

(42)
... Very wise, I arrived back once and found the machine still going with the mirror just teetering on the edge of the table, while the aligator arms had
walking_david
42
posts
Jun 24

Re: hrlp fot pin hoke cam

(5)
lAST ADDITION somebody know Barry D malpas he whrote this http://www.coconinoastro.org/OBSERVING%20SUNSPOTS%20USING%20A%20PINHOLE%20CAMERA.pdf
savardjacques@ymail.com
5
posts
Jun 9

Holes

(9)
Yes But Where is the pleasure to built I try first my print cartrig edeal Jack 47’n71 ‘W Keep you inform of result On 6/8/2015 2:42 AM, Peter
jacot
9
posts
Jun 9

Status of stuff

(3)
Anthony, Obviously your having fun. But if I may suggest something, get rid of the RJ-11 connectors. They are flaky and were never designed for how the
Mark Christensen
3
posts
Jun 6

FLAT OR NOT FLAT

(5)
I have the project to made a lens like de e jone one 75 f focal for sun veing from 1\4 plate ordinary glass Have 2 10 inch mirror dismantle for the
jacot
5
posts
May 26

Re: [ATM] Channeling Mr. Pitch

(5)
Yes, Anthony, Channeling pitch laps under cold flowing water works very well. My preferred technique. However, what to do with all those fine flakes ?
paul valleli
5
posts
May 25

curious gif

(4)
softens at 140C  decomposes at 160C I googled, pvc melts at what temperature On Sunday, May 17, 2015 2:54 PM, "jacot jacquessavard@videotron.ca [atm_free]"
Anthony Stillman
4
posts
May 17

Atmosphere last night

(3)
Thanks Mel, I forgot to try the central star, next time.... Zoran On Friday, May 8, 2015 8:14 PM, "mbartels@bbastrodesigns.com [atm_free]"
zoran stojcevski
3
posts
May 12

>OFF TOPIC

(3)
Jack, It is generally believed that the heat and winds produced by the T-Tauri stage of the suns formation, both much greater than todays', generated as stars
Mark Christensen
3
posts
May 10
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