Re: [APML] OT: Pleiades Mosaic

[Steve <sc02492@yahoo.com>]

Thanks to everyone for their kind comments!  Joe, I've
found that you cannot use the autofocus sensor for 10D
wide field astrophotography using EOS compatible
lenses.  It doesn't know quite what to focus on, since
everything is at "infinity."  For prime focus shots, I
use the STI Stiletto IV for focusing and have found it
to be very accurate (after some minor tweaking). 
Actually, focusing through the viewfinder for an
object like the moon may not be so bad, but it won't
really get you tack sharp.  Unless you have something
like the STI product, it's best to check the image
focus with the laptop and adjust as needed.  There is
also software that makes 10D focusing easier as well,
but again it requires the laptop at the scope.  Check
out:
 
http://www.liquidfusion.com.au/astro/dslrfocus/default.htm


Steve Cannistra

--- pedit@email.unc.edu wrote:
> Quoting Steve <sc02492@yahoo.com>:
> > Details:  This represents a total of 30 frames
> > requiring about 3.5 hours of  exposure, taken with
> the
> > Canon 10D at ISO1600 (6 to 9 minutes per 
> > exposure), through the LX90 at f6.3, autoguided
> with
> > the STV/e-finder.
> 
> Steve,
> Nice work.  Is the autofocus sensor on the 10D
> sensitive enough to
> accurately focus through your telescope at f/6.3? 
> For example, can you
> focus on the edge of the moon or on a bright planet?
>  I am interested
> because I would like to use a 10D with my f/6.8
> telescope for imaging
> lunar eclipses and next year's Venus transit without
> needing a laptop to
> check focus.
> Thanks,
> Joe
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