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Thanks.
does this mean that with F/4, you always have to use a field flattener even with prime focus or visual observation?
i have'nt seen one, but i presume its a lens, would'nt that additional glass reduce the brightness of objects?
i used a 9mm plossl eyepiece with my F/6 to view jupiter and saturn and they were'nt too big. so was thinking of getting a wide field 4mm or 6mm rather than using a barlow.
how does the F/4 perform visually for planets, i'm guessing you'd need atleast a 3X barlow to see some details.
now with venus, saturn and jupiter visible, I was hoping to get some good views or pics.
with the other types of scopes such as RC's, or SCT's, the focal ratio is usually quite high with folded optics, same for refractors. how are they able to achieve good results for DSO's if faster optics generally are considered better for DSO's?
do you have any pictures of your F/4 scope?
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