Re: Re: [APML] Achromats?

[steve banbury <banburys@sonic.net>]

I have their catalog at home with plots for transmissibility.
Will look it up tonight if noone else has one handy.

Steve

At 04:18 PM 7/8/02 -0400, you wrote:
>
>I recall seeing an old issue of S&T reviewing the various filters offered
by Lumicon, Orion and Meade. I also remember seeing the filter shapes on
this review. 
>
>Loke
>
>
>
>> 
>> From: "Jim Janusz" <jjanusz@dc.rr.com>
>> Date: 2002/07/08 Mon PM 03:51:37 EDT
>> To: <astro-photo@seds.org>
>> Subject: Re: [APML] Achromats?
>> 
>> Does anyone know the bandwidth of the Lumicon h-alpha filters?
>> 
>> Just curious.
>> 
>> Jim
>> 
>> 
>> snip 
>> > One good use for an achromat is for h-alpha imaging. The Custom
>> > Scientific h-alpha filters are 3-4nm in width and so the color within
>> > this range has pretty much the same focus. 3-4nm is much narrower than
>> > say a red tricolor filter which might be a 100nm wide. 
>> snip
>> 
>> 
>> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>>              Unsubscribe at <majordomo@seds.org>
>> 
>
>
>--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>             Unsubscribe at <majordomo@seds.org>
> 


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>