From: Johannes Schedler (j.schedler_at_antispamdomain.not)
Date: Wed Nov 26 2003 - 01:34:44 EST
Raoul,
you are right, the 2x extender with the 300mm lens degrades the image
quailty, I had to stop down the lens to f/4, then it was better, but
even then not as good as without extender.
I just was too lazy to demount my TMP APO from the permanent mount.
Johannes
--- In digital_astro_.at._yahoogroups.com, "Raoul Schlesser" <gr842_.at._y...>
wrote:
> Johannes, Paul, Pete:
>
> nice collaboration going on there! Amazing that there's that much
of a parallax
> effect visible between the 2 continents - although when thinking
about it, there
> better should be! :)
>
> Q: were the two images taken at the same time?
>
> Q (for Johannes): just saw that you used the 300/2.8 with a 2x
extender. The
> image looks pretty sharp, even though many people report that 2x
extenders
> degrade image quality. Can you use the 300mm + 2x wide open, or is
this a
> bad idea? (I realize that you have a TMB of similar f.l. and f/#,
but I'm curious,
> since I never tried this myself)
>
> Thanks,
> raoul
>
>
> --- In digital_astro_.at._yahoogroups.com, "Johannes Schedler" <
> j.schedler_.at._p...> wrote:
> > Thanks to the efforts of Pete Lawrence there is a nice animation
> > available that shows the different views of the Moon from 2
> > continents at the same time.
> >
> > He combined my and Paul Hyngman's image in a perfect way, you can
> > find it here (and for sure very soon on Paul's page):
> > http://panther-observatory.com/moon.htm#24
> > (bottom image)
> >
> > It should be possible to make a real 3-D image from this, sure
there
> > are experts here for this.
> >
> > Johannes
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