Thanks. I was not really concerned with the visible light, but with the UV.
I guess what I was concerned about was whether the glass is as efficient at
blocking UV as it is at blocking visible light. It could be minimally
acceptable in the UV band for naked-eye observation, but magnification would
put it over the safe limit. See what I mean? {pardon the pun}
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-----Original Message-----
From: Wagner,Rick [CIS-ADS] <rick.wagner@...>
To: 'OAFs@...' <OAFs@...>
Date: March 29, 2001 08:35
Subject: RE: [OAFs] Larger Solar Spot...
Sure it's safe. I have a 2x4" welder's glass which I use in front of my
9x21 binos for quick checks of the sun. A telescope/binocular can't
concentrate the light to any greater intensity than that which is coming
into the objective. Therefore anything which is safe to look through with
the naked eye is also safe in front of the objective. BUT, make sure you
fasten it on well and make sure that it covers the whole objective. The
optical quality of the filters isn't great but at 9 or 10x it's fine.
Rick
-----Original Message-----
From: Bruce McGlashan [mailto:mcglashanb2@...]
Sent: Wednesday, 28 March 2001 18:33
To: OAFs@...
Subject: Re: [OAFs] Larger Solar Spot...
snip
My wife suggested I haul the finderscope off the scope and look at the sun
through it and the welder's glass (glass in front). I didn't try it,
because I wasn't sure that's a safe thing to do. Anybody know?
snip
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