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Originally Posted by ausastronomer
You really need both a 6mm and the 7mm because of variable seeing and if you can afford it you also need a 5mm for nights of very good seeing. I have many nights where the 5mm or the 6mm will not hold up and you need to drop back to the 7mm, particularly on Jupiter and Saturn.
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My planetary workhorse combo is a 14mm XL in my Ultima barlow.
The barlow gives an effective mag boost of 2.2x giving effectively a 6.36mm eyepiece and 196x mag.
As I mentioned I also own a 7mm ortho which I feel isnt enough magnification.
If I cant get a pleasing view at 196x, I wont bother looking at planets as IMO there isnt worthwhile detail to be seen. I just mention this as I dont think its worthwhile to sink the big eyepiece dollars into a lower planetary magnification.
