There are many threads discussing using 2" astronomy filters in 50mm objective binoculars. However, those with larger objectives (eg 60mm, 70mm, 80mm, 100mm) are left to figure out other options.
There ARE optical filters that are 72mm (fits over 60mm objective housing), 77mm (would fit onto a 70mm objective housing), 82mm (fits onto 80mm housing), and larger that can be taped onto the objective housing/dew shield. These filters are for camera lenses. Being such, they are optimized for a cmos sensor. But, like all filters, they have a passed spectrum and perhaps could be useful for visual use with binoculars.
I myself am trying the ICE LiPo light pollution filter to counter light pollution on my 12x60 and 20x80 Oberwerk binos. They give a light purple hue, thus do cut out yellow wavelengths, so make seeing stars and bright nebula easier. But these aren't as strong as a SkyGlow astronomy filter.
Another thing I am wondering is if a yellow or 81EF "warm" filter would counter chromatic aberration like a semi-apo or long pass astronomy filter does.
There are a whole number of filters to choose from various vendors, for example:
1) have any of you tried camera filters (eg 72mm, 77mm, 82mm, etc.) for your big bino objectives?
2) has anyone done a study of camera filters for visual use on big bino objectives for cutting light pollution, seeing nebula, cutting CA?
3) does anyone know where the passed spectrum for camera filters could be found? (google searching this data, this is not as readily published like astronomy filters where most sites like Baader, Orion, etc. show you the spectrum passed on the filters they sell)
4) is this just a dumb idea and I should give up on trying to put objective filters on 60mm+ binos?
Note: with a spectrum plot you could search and find like spectrum bands for camera filters as astronomy filters, especially skyglow, semi-apo, fringe killer, UHC, H-B, etc.)
Edited by ABQJeff, 12 May 2021 - 12:11 AM.