Key words: "Because I have another better scope for planetary observations, I rarely push my AR127 above 80x" A 6" F/8 Dob is a much better scope for planetary and costs $300. You already have a nice wide field (that you can also look at the Moon with) Buying things that make your scope live up to it's potential makes sense IMO. If you buy anything for your AR 102, maybe it should be the widest field best corrected 2" EP's that you can afford. (And not waste money changing purple to yellow) $300 6" Dob beats the planetary detail that can be seen in a $3000 4" APO. AR 102, best in 4" class widefield. 6" F/8 Dob best in ($300) class planetary. I might eventually switch to an ST 120 for wide fields, but the 6" Dob has to stay as the cheap planet killer on my to buy list. https://www.amazon.c...2/dp/B0018IWQC8 Halfway to the price of something that could actually see way more planetary detail. A filter or another scope that could see deeper DSO's as well. Edit: If the color is objectionable send it back for a refund (save up a little more $) and try the A.T. 102 ED or SW Pro 100 ED, or even the new F/11 ED from Altair astro. If you like refractors
Well, it looks like we've drifted a bit from the original topic.
I've pushed an AR152 beyond 300x. To me, it doesn't matter if another telescope can do one thing or another better. I'm more interested in getting as much as I can out of whatever telescope I happen to be using.
With that philosophy in mind, I use my AR152 as a general purpose, lunar - planetary - deepsky - etc. telescope -- just as I use my Astro-Physics apochromat, my larger Newtonians, my smaller achromats and even my small, lowly (but still capable!) singlet refractor.
It doesn't matter which telescope does better than the other. It doesn't matter to me when I have other telescopes. It shouldn't matter to those who have only one telescope. No matter what telescope a person uses, someone, somewhere has access to a more capable telescope.
So, unless a person wants to forever be buying larger and better telescopes; we all might as well learn to be happy with whatever we're using.
P.S. adding a CA-reducing filter to most of the current crop of achromats will improve their performance when it comes to high magnification lunar and planetary work. There's nothing wrong with trying to gain more performance out of a telescope.