Re: [APML] Bisque IFocus eyepiece

[<apml@andreasroerig.de>]

Hi Emmanuele,

I don't have any experience with the eyepiece from Bisque but I found
that the Vixen LV 9mm eyepiece is parfocal with the ST4. I use it to
focus my ST4 for several years now and it works great. I never was able
to get a better focus than I got with this eyepiece. However you can use
almost every eyepiece in combination with one or two 1.25" setting
rings. That means you once focus the ST4 by using a computer and
Hartmann mask or whatever, lock the focuser of your guidescope and then
slide in the eyepiece as far as needed to reach focus. Then you lock
this position on the eyepiece with the setting ring. It may happen you
need a setting ring on the ST4 as well to reach the focus with the
eyepiece.

Best regards
Andreas

:=============================
: Andreas Roerig
: http://www.andreasroerig.de



Emmanuele Sordini <vega@bloomingstars.com> schrieb am 10.12.2003,
23:46:51:
> Hi list,
> I've recently been struggling to find a way to focus rapidly and 
> consistently my ST-4; and since I'm the lazy kind of amateur astronomer, I 
> would go the easy route and try (if possible) to avoid fiddling with cables 
> and control boxes in the dark.
> 
> One idea I had thought of a while ago was to property focus the CCD by 
> using a video capture program and something like a Hartmann mask; this 
> method sounds reasonable, but calls for using a portable PC in the field 
> and should take some time and the ST-4 can not display a real-time image, 
> as is the case with a webcam.
> A few days ago, while surfing the 'Net, I ran into the IFocus eyepiece from 
> Software Bisque: frankly, it looks like an el-cheapo eyepiece not worth its 
> price, but it promises to be parfocal with many SBIG units, apparently 
> making it a breeze to focus the ST-4. So I ask you:
> 
> 1) Anybody currently using / have experience such unit?
> 2) Does it work just right out of the box (which could justify its cost) as 
> avertised, or is some tinkering needed anyway?
> 
> Thanks in advance,
> Emmanuele
>
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