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For anyone that's interested, i've been doing more research. Basically the quark will work fine with an ordinary achromat refractor as the quark removes all chromatic aberrations. I'd suggest a small aperture size of say 80mm in order to get a full disk view. Using a cheap achromat refractor with a quark appears to be the best way forward for doing solar unless you want to get a dedicated solar telescope like a Lunt which is very expensive. APOs are not necessary and probably best avoided unless an ERF is used. This is especially true if the aperture of the refractor is greater than 150mm and you are imaging a long time. Also, avoid using refractors where the elements are oil spaced. While my 102mm ED sextuplet will possibly be OK, i'm not going to risk it. Feel free to correct me if i have anything wrong.
Happy viewing.
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