Damaged Ep
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Airconvent
- Super Moderator
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Re: Damaged Ep
Actually you can give it to Gary to be used as a demo piece for his talk too......recycling ! haha
The Boldly Go Where No Meade Has Gone Before
Captain, RSS Enterprise NCC1701R
United Federation of the Planets
Captain, RSS Enterprise NCC1701R
United Federation of the Planets
Re: Damaged Ep
Hahaha. We are planning something interesting with this eyepiece. Stay tuned...Airconvent wrote:Actually you can give it to Gary to be used as a demo piece for his talk too......recycling ! haha
http://www.astro.sg
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
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superiorstream
- Posts: 1467
- Joined: Mon Nov 03, 2008 4:45 pm
Re: Damaged Ep
Hi,Dave
The -cracking of the lens- is kind of unexpected because years ago(actually around 1979/1980)
when I build my first solar scope,I did use a 40mm diameter lens-objective- and actually CONCENTRATE the light on various lens,eyepieces(THEN,only have 0.96 type),filters and tested its effect including using thermometer,touch etc -befor I use my eye!.It gets pretty hot but none crack.
If you dont mind(never mind selling or not),I definitely like to open up the ep and see really what happened.If I am not mistaken,none of the lens in hyperion 24mm ep has diameter bigger than 40mm.So when can I met you?;as I always want to learn sth new and always interested what the sun can give.Thanks.
The -cracking of the lens- is kind of unexpected because years ago(actually around 1979/1980)
when I build my first solar scope,I did use a 40mm diameter lens-objective- and actually CONCENTRATE the light on various lens,eyepieces(THEN,only have 0.96 type),filters and tested its effect including using thermometer,touch etc -befor I use my eye!.It gets pretty hot but none crack.
If you dont mind(never mind selling or not),I definitely like to open up the ep and see really what happened.If I am not mistaken,none of the lens in hyperion 24mm ep has diameter bigger than 40mm.So when can I met you?;as I always want to learn sth new and always interested what the sun can give.Thanks.
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wucheeyiun
- Posts: 1758
- Joined: Tue Sep 07, 2004 5:57 pm
- Location: marine parade
- Contact:
Re: Damaged Ep
I think there is an unequal heat induced matter expansion of metal barrel , glass lens and metal retaining ring material causing the lens to stress and to crack internally...