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Thanks for the advice. I'll go on the assumption that i have to add an IR cut filter in front of the quark. I'll forgo the diagonal as i want to image rather than do visual.
Despite this, the threads i have read give me some concerns regarding focus so unless i can get some understanding about whether it will work, im not going to risk the money..I sent an email to Myastroshop so will see what they say.
thanks again
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