I’m looking for a pair of zooms to use in my Binoviewer. The XFs and the MCIIs look like very nice options the XFs are 19.5mm-6.5mm and the Nikons are 21mm-7mm. Both are light weight, which I like a lot and they’re both about the same price. The Pentax run about $290 while the Nikons are about $300. Has anyone done a direct comparison between between these two zooms? I’m interested in using them for lunar, planetary, and hunting double stars.