"best" per-inch magnification for Moon?
Posted 10 September 2013 - 08:37 PM
Posted 10 September 2013 - 09:17 PM
Posted 10 September 2013 - 10:11 PM
Posted 10 September 2013 - 10:42 PM
Where it is open ended is that the unique nature of having such an intensely detailed object THAT close is - there's a great view to be had even in a finder scope. My Nikon 8x42s provide a brilliantly riveting view of the moon. Of course there are no details like you will see at say, 350x through a ten inch but the view has the presentation of context that the narrower field higher resolution instruments can't duplicate. The 24x view through my 70 mm is one of the best views I EVER get of Luna. And if its a crescent moon with the night time earthshine present - that little low power refractor view is nothing short of an absolute beauty.
Ehhh so its open ended. There's so much there it has a lot to offer at many levels.
Posted 11 September 2013 - 05:37 AM
Nearly all the detail I can see at 200x(50x/inch) I can also see at 83x(21x/inch) though it is tougher to see at times. Today for instance I saw a long and magnificent rille south of three large craters(Theophilus, Catharina, and I dont remember the third) in 200x but couldn't see a clue of it in all the hills at 83x. Therefore, I recommend using a variety of magnifications.
Posted 11 September 2013 - 12:05 PM
There is no one 'best' magnification per unit magnification.
And since it is also true that Exit Pupil = 25.4 / (mag per inch)
then the upper and lower values of exit pupil that may give "concerns" (seeing the secondary shadow or distraction by floaters in the eyeball) will also have corresponding "mag per inch" values.
[Note: The "formula" above is just a rearrangement of the standard formula for calculating Exit Pupil as = Aperture/Mag ]
Posted 12 September 2013 - 03:56 AM
Posted 12 September 2013 - 06:29 AM
Bigger is better and then pushed to whatever useful maximum limit the conditions will allow.
Posted 13 September 2013 - 08:45 AM
At 400x, I saw some very fine detail along the ridges of craters Ptolomaeus, Alphonsus and Arzachel, including details of craters inside of those. It was really quite a sight, even with a dimmed view having pushed beyond reasonable magnification.
Removing the Barlow was better, and the same details came through as every bit as sharp. That was at 200x, which would be pushing beyond the limit of the 35x per inch rule. Sometimes experimenting is the most fun way to determine the "best" magnification for your set-up.
Posted 14 September 2013 - 04:05 PM
Posted 19 September 2013 - 09:58 AM