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Re: [OM] Variable ND filter

Subject: Re: [OM] Variable ND filter
From: Chris Trask <christrask@xxxxxxxxxxxxx>
Date: Sat, 1 Jun 2013 07:18:23 -0700 (GMT-07:00)
>
>>
>>> Can anyone recommend one for occasional use ?
>>>
>>
>> I have a variable ND filter for 1.25" telescope eyepieces.  It
>> consists of a pair of linear polarisers, one fixed and the other
>> rotated.  Works damned well, almost darkening the moon completely.
>>
>> Which reminds me:  Things are always darkest just before they turn
>> pitch black.
>>
>
>As Ken mentioned, the problem with polarizers is the highly variable 
>effect on wide angle views... something your telescope doesn't have to 
>worry about.  :-)
>

     Yes, I saw his post on that.  Sometime soon I'm going to see how well a 
pair of Hoya or Tiffen linear polarisers will work.


Chris
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