RE: [APML] Re: Bisque IFocus eyepiece

["Thom Iwancio" <tiwancio@sc.rr.com>]

Emmanuele,
	This is exactly the same approach I use for focusing my ST-5C I
use as a guider.  I use a Meade 12mm illuminated eyepiece and a homemade
setting ring.  The advantage I have is being able to use a pc to focus
the ccd initially.  It doesn't matter whether you use your eye glasses
or not as long as you do it the same way in the future.  The crosshair
eyepiece also really helps to center your star on the chip.

Thom Iwancio
Elgin, SC
www.machunter.org
home.sc.rr.com/thomiwancio


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of Emmanuele Sordini
Sent: Thursday, December 11, 2003 4:02 AM
To: Discussion of Film Astrophotography
Subject: [APML] Re: Bisque IFocus eyepiece

apml@andreasroerig.de Scrive: 

> 
> 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. 

Did you have to add some setting ring, or did it work just fine right
out of 
the box? This could be a better option than an IFocus eyepiece, because
the 
Vixen unit could make a fine accessory for visual use too. 

> I never was able to get a better focus than I got with this eyepiece. 

Do you focus visually? I ask you this because I wear glasses, that might
be 
a hindrance to using any kind of eyepiece. 

> However you can use
> almost every eyepiece in combination with one or two 1.25" setting
> rings. 

I don't have any setting rings at hand... but I'll try looking from
them. 

> 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.

That's a good idea: have you ever tried it? If that's the case, what 
software do you use to focus the ST-4? Since I don't have any old DOS
PC, I 
guess I'll have to try searching for some a program running under
Windows 
(ME/2000/XP). 

Thanks anyway,
Emmanuele 
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