[QUOTE=Tropo-Bob;1086127]
Quote:
Originally Posted by barx1963
James
I found that pushing the power beyond the 115x that I could get with a 13mm EP was only rarely possible and even a 10mm ethos giving 150x was viable only on those rare good nights.
Power is not always your friend as it magnifies any atmospheric disturbance.
My experience was the same as above. (Except I do not have a 10mm ethos.) However, even using the 13mm ethos instead of a 12mm nagler or a 10mm radian gave a noticable improvement in the clarity of the image.
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I still think it darn strange. Using those lower powers/bigger exit pupils is going to make it pretty tough to find many of those faint galaxies.
Are we perhaps talking "image" in relation to two different things? When looking at brightish DSOs like open clusters (especially before the telescope has cooled down) and one sees lots of big blobby stars, I can see why lower power delivers a nicer, more pleasing overall image. But when looking at very faint stars trying to just discern a tiny fuzziness from the background - well, that's a different situation. It never matters to me whether the telescope has cooled down or not. In most cases, 2mm exit pupil is the optimal way of easily discerning those faint fuzzy galaxies or pieces of nebulosity.
Regards,
Renato