Re: optician's trial lens for telescope use?
- From: waz <wazungy@xxxxxxxxxxxx>
- Date: Fri, 22 Jul 2005 10:16:09 -0400
Michael Koch wrote:
> Hi Waz,
>
>> All my eyepieces have 1.25 inch barrels with threading for filters so
>> this is the easiest universal fix if it works optically.
>
> The problem is that the filter thread is not far from the focal plane.
> If the astigmatic lens is near the focal plane, then it must be a strong
> astigmatic lens (much stronger than if used between eyepiece and eye).
> If the astigmatic lens is located exactly at the focal plane, then it
> doesn't work at all.
>
> Michael
This is very interesting info!
Thank you very much for the explanaition.
Waz.
.
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