Telescope-Accessories-Astronomik MaxFR OIII 6 nm CCD 1.25″ (M28.5) Round Mounted Filter

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1. Emil N. Verified Buyer – 28 July 2022

   Large stars and halo effect experienced with my previous OIII filter was my reason for buying OIII6-MAXFR-1. I saw a video from a photographer comparing OIII images taken with 2″ filters, and I didn’t hesitate much after that. I made a budget decision about buying 1.25″ because my imaging cameras don’t have full frame sensor. So far, I don’t see a

   ny vignetting when imaging with ZWO ASI1600MM PRO. What I see are pinpoint stars comparable with the stars taken with my 7nm HA filters. There is a small side effect which I like to inform about. It is not caused by the filter, but the filter is taking part in it. In general, my ASI1600MM is causing Newtonian rings. I see them only when making flats because of the light intensity. They are not seen in dark deep sky images. Now with this filter I see signs of them in the integrated deep sky images. Not easy to see, almost invisible but still present. Maybe because this filter was designed for work with very fast, up to F/2 telescopes it is somehow contributing to the effect. Those rings could well not be present when imaging with any other camera and could be specific to my camera only. If you don’t see rings when making flats you most likely will not see them in the light images either. The rings didn’t trouble me at all because the flats were able to entirely remove them. With this all said I strongly recommend the product for narrowband imaging. This is probably the best OIII filter that you could purchase for that money, and I am very happy with it.