Re: Cleaning EP's

I have one of those pens in my camera bag, but I only use the brush end to
remove dust from my Topcon Super D lens, why? back in 94 when I got my Orion
DSE 12.5 and some EP's to go with it, I used the disk part on an EP ( Orion
17mm ) and that night I found that the coating had been damaged by the
cleaning disk of the pen. Still used that EP for many years, but it's image
was never really good. So I've never use that disk again, even on my camera
lens.


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"Mark D" <mmd49@xxxxxxxxx> wrote in message
news:7252-42ED69C8-453@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

> Hi Brian, The principal I don't like about the Lens Pen, is that I
> clean one smeared, or dirty Eyepiece with it, then I'm going to use this
> now contaminated Lens Pen again, and again on another
> Eyepiece-Eyepieces.
>
> You'll find most renown "Eyepiece Junkies" won't use a lens pen.
>
> The way I feel about this, is that it wouldn't bother me in the
> slightest if I had to use a whole box of 320 Q-Tips to clean just one
> eyepiece. It's worth it to me. (Yes I know I'm over-exaggerating)
>
> Q-Tips or 100% Roll Cotton is relatively cheap.
>
> Surprisingly, I don't use HPLC Grade Chemicals, but have thought of
> buying, and using them countless times to not only clean Eyepieces, but
> also Lenses, and Corrector Plates.
>
> Perhaps for just run of the mill $30 Eyepieces, what you use is not so
> critical, as if you ruin one it's no great loss, but some of my
> eyepieces range anywhere from $200, to $500 apiece, and I'd like to
> clean them without the possibility of incurring any damage to them.
> Mark D.
>


.

Relevant Pages

  • Re: Cleaning EPs
    ... I have one of those pens in my camera bag, but I only use the brush end to ... remove dust from my Topcon Super D lens, ... > clean one smeared, or dirty Eyepiece with it, then I'm going to use this ... > You'll find most renown "Eyepiece Junkies" won't use a lens pen. ...
    (sci.astro.amateur)
  • Re: close focus formula
    ... from the object and you only have to move the focuser or mirror ... D1 is the distance from the object to the center of the lens ... D2 is the distance from the lens to the eyepiece. ...
    (sci.astro.amateur)
  • Re: close focus formula
    ... from the object and you only have to move the focuser or mirror ... D1 is the distance from the object to the center of the lens ... D2 is the distance from the lens to the eyepiece. ...
    (sci.astro.amateur)
  • Re: close focus formula
    ... from the object and you only have to move the focuser or mirror ... D1 is the distance from the object to the center of the lens ... D2 is the distance from the lens to the eyepiece. ...
    (sci.astro.amateur)
  • Re: close focus formula
    ... from the object and you only have to move the focuser or mirror ... D1 is the distance from the object to the center of the lens ... D2 is the distance from the lens to the eyepiece. ...
    (sci.astro.amateur)