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Success on the processing side - turns out with a cool box cooled Canon DSLR stacking dark frames using median kappa algorithm is a bad idea - whereas median looks great!
So back to the cleaning question (and apologies for the distraction). I have Bintel cleaning fluid but no instructions.
Do you put it on straight or dilute it with distilled water?
Do you rub spots gently or not (and if so with what surface)?
Do you wipe it clean with a dry cloth of some sort or a very low set hair dryer - to best prevent streaking?
More information on the cleaning processes itself would be greatly appreciated!
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