Astrophot : Eye Projection better than Prime Focus?

Hi,
I tried a spot at astrophotos on my ETX105EC using a Nikon digital camera
but was amazed to see that the pics taken using manual handheld eyepiece
projection is better than prime focus using a Scopetronics Dgi-T
combination. I get higher magnification using the former. Any idea why this
is so?
I'm guessing it has something to do with focussing.
Here are the comparison:

Eyepiece projection :
http://photos.groups.yahoo.com/group...da/My+Astro+Pi
cs&.src=gr&.dnm=Jupiter.jpg&.view=t&.done=http%3a//photos.groups.yahoo.com/g
roup/singastro/lst%3f%26.dir=/Jornada/My%2bAstro%2bPics%26.src=gr%26.view=t

Prime Focus:
http://photos.groups.yahoo.com/group...da/My+Astro+Pi
cs&.src=gr&.dnm=Jupiter+3+-+24+May+2003.jpg&.view=t&.done=http%3a//photos.gr
oups.yahoo.com/group/singastro/lst%3f%26.dir=/Jornada/My%2bAstro%2bPics%26.s
rc=gr%26.view=t

(You may have to cut and paste if the link above gets truncated)

Thanks

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Thanks