R: [APML]: Binocular Vixen 12X80

["giovanni casano" <casano@docline.it>]

Hi all!
I am myopic, there was room for 6.75 diottries.
I have tried to unscrew him ocular of the binoculars but I have not
succeeded there.
I am also afraid to break him ocular if I put a lot of strength.
The binoculars is still in guarantee.
Hi, Giovanni Casano Pisa


-----Messaggio originale-----
Da: Tom Krajci <krajcit@det5wg57.barksdale.af.mil>
A: giovanni casano <casano@docline.it>
Cc: astro-photo@nightsky.com <astro-photo@nightsky.com>
Data: sabato 24 gennaio 1998 4.51
Oggetto: Re: [APML]: Binocular Vixen 12X80


>
>> From:          "giovanni casano" <casano@docline.it>
>
>> Another problem is my binocular Vixen 12X80.
>> Me being myopic I don't succeed without glasses to put to focus the
>> binoculars.
>> How to do?
>
>You may have to inspect the focus mechanism, but maybe you can do a
>modification to allow the binoc's to focus for you without glasses.
>
>Big question:  Do you have astigmatism?  If so how much?  If it's
>more than about .25 or .5 diopter then you will never have very sharp
>images with your glasses off. . .in that case you may want to
>consider contact lenses.  When I want razor sharp vision I use the
>uncomfortable, semi-rigid, gas permeable type.  (I can tell the soft,
>comfortable contact lenses don't give me as sharp vision.)
>
>Since you are myopic (I am too and have fought this problem) you
>would have to modify the focuser to move the eyepieces closer to the
>objective lens.  It may only take 1-2 millimeters to make the
>difference you need.  It depends on - your mechanical skills and if
>you are willing to risk voiding the warranty on the telescope.
>
>Maybe the objective lenses can be shifted closer at the other end of
>the tubes?  (IT would have the same effect)  But be careful. .
>.collimation could be thrown off and you'd have to spend time
>readjusting that.
>
>Hope this helps.
>
>Tom Krajci
>
>Capt Tom Krajci
>B-52 Intelligence Officer
>"In God we trust, all others we monitor!"
>http://spur.barksdale.af.mil