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Fitted my own filters. I bought the LRGB via Bintel with the purchase and I bought the narrow band later. Fitting them yourself will not stop dust from getting on the filters. As soon as you open the nose piece dust will get into system, so you will still have to do flats. Finger prints are easily rubbed off too, the coating on the filters are very hard. Choice is yours though. Maybe investigate getting mounted filters. I have those and get no vignetting to speak of on my f5.6 system. As stated you can go to f4 and not get any vignetting. You could buy the filters a bit cheaper from the states too. Buy the camera from Bintel, their service is worth that little bit extra and then the filters from OPT or the actual manufacturers.
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