Thanks, I once looked with only the filter (so no telescope) towards
the sun without problem, so mine must be of the 5ND type then.


--- In Baader-Planetarium@yahoogroups.com, "Michael Swanson"
<swanson.michael@...> wrote:
>
> Hello,
>
> Turns out it is pretty easy to tell. Take the filter outside on a sunny
> day. If you have the photographic type film (3.8 ND), you will be
able to
> see through it when you hold it up in front of you. With the visual
type
> film (5 ND), you will not be able to see anything. You can then
hold it up
> between you and the Sun. With 3.8 ND, the Sun will be too bright to
look at
> comfortably.
>
> Best regards,
> Mike Swanson
> Author of "The NexStar User's Guide"
> Author of "NexStar Observer List"
> http://www.NexStarSite.com
>
> -----Original Message-----
> From: Baader-Planetarium@yahoogroups.com
> [mailto:Baader-Planetarium@yahoogroups.com] On Behalf Of patrickduis
> Sent: Thursday, February 12, 2009 8:14 AM
> To: Baader-Planetarium@yahoogroups.com
> Subject: [Baader-Planetarium] Baader solar filter
>
> Hi, a few months ago I bought a fairly cheap (around 40 euro's) 2nd
> hand (self built) solar filter for my 8" scope. When I look through
> the filter towards the sun I can see it very nicely. Up till now I
> didn't dare to look dat the sun with this filter because I recently
> found out there are 2 grades. 3.5 and 5 ND. Is there any way to tell
> which grade it is?
>
>
>
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