i am deciding on a small portable ota to put on my celestron slt mount. a orion skyscanner 100mm or a SVBONY SV48 90mm F5.5 2" Refractor selling on ebay. my goal is to observe bright dsos. i have a 8" dob, for dsos, and a 5in mak, for planets, but wanted somthing portable and affordable for my goto. does anyone have an opinion to share on which would be better for dsos? below is the ebay link. thanks in advance.