![]() If you focus robotically you can build that into your filter changes. What's the problem? In a sealed wheel bunnies don't come from the filters - in my experience.Ĭome back at the end of the night: you'll be very lucky to get away with no refocus during the night. Due to an almost complete transmission of H-Beta and O-III emission. Made to the highest technical standards for the high optical performance you want and need for observing deep sky objects. Multiple flats: I use luminance flats for all filters. The Astronomik UHC Sony Alpha 7 clip filter works with 2' aperture telescopes and above, but works best with 5' (125 mm) aperture instruments and larger. You can make the same compromise with mono and filters if you like, or you can focus per filter if you prefer.) Non parfocality really comes from the optics, so with OSC you make a compromise focus because that's all you can do. ![]() (My point is that good quality filters of the same make are parfocal. Refocus: bear in mind that with mono you can, if you like. I prefer just one filter, press go and come back at the end of then night when its done I cant be bothered (to be honest) shooting multiple flats, refocusing etc for each filter. But for me in the limited clear skies we tend to get, OSC with a dual/tri band pass is too much convenience to ignore. The filter corrects the displaced colour reproduction of a converted camera so that it can also be used for normal every-day photography, without having to revise every image on the computer.Yep, there is a still a big argument that if you want the absolute best quaility, mono with narrowband filters is the way to go. ![]()
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