I would expect more distortion at .3 also as the 'light cone' is steeper.

As for being able to "watch the changes over time", I do that all the time
also - each image has something different wrong with it from the last one!
:-)

Seriously, they are getting better. We'll see how the new scope changes
things. I hope to post some to my web page eventually also
(http://www.venomtech.com/~tkroes). Right now all I have up there are my 8"
modificiations. I suppose I'll be adding some more of those also with the
new setup.

Anthony J. Kroes
Green Bay, WI


> -----Original Message-----
> Mark de Regt
> Sent: Tuesday, August 28, 2001 6:00 PM
> Subject: [M]: RE: RE: Focal reducer recommendation
>
>
> > Anthony J. Kroes
> > Sent: Tuesday, August 28, 2001 10:55 AM
> > Subject: [M]: RE: Focal reducer recommendation
>
>
> > You mentioned that you do not use the
> > 'spacer'. Is that
> > the T-thread extender that comes with the FR?. What is it's
> > purpose if you
> > can do without?
>
> I have two spacers/T-adapters; their purpose is to allow one to
> have varying
> reduction from .5, with no spacers, to .3 with both spacers. I have never
> used any of the spacers; I expect to soon, however, as I attempt
> M33, which
> is too large to fit at f/4.6. I suspect that there will be more
> distortion,
> but I'll see.
> >
> > Another question I had involves the proper FR to CCD chip
> distance. In my
> > setup, what is the optimum placement? The spacer may have
> something to do
> > with that, but if so, does the position (or lack) of the CFW8
> > screw that up
> > (as it is in between the two)?
>
> This is beyond me. Some in this group (and SBIG) know this kind of thing.
>
> >
> > Thanks for the site URL, it was nice to see real pictures
> explaining what
> > you were talking about.
>
> My pleasure. It also provides me with a record, since I am not systematic
> enough to keep notes. It's interesting for me to watch the changes over
> time!
>
> --Mark de Regt
>
>

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