The photography of galactic nebulae with extremely fast optics can only really be effective with the f/2 Highspeed filter.
The full width at half maximum of this filter is optimised for fast apertures of f/1.8 to f/3.5, where despite the high line broadening at this aperture ratio, a high contrast is still possible.
The filters are also ideal for Celestron RASA Astrographs.
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Filters OIII CMOS f/2 Highspeed 36mm
$ 188.00
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Filters OIII CMOS f/2 Highspeed 1.25"
$ 161.00
ready for shipping in 1-2
weeks
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Filters OIII CMOS f/2 Highspeed 2"
$ 265.00
ready for shipping in 1-2
weeks
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Filters OIII CMOS f/2 Highspeed 50x50mm
Sale price:
$ 313.00
$ 194.48
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h
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Filters OIII Highspeed f/2 31mm
Sale price:
$ 178.00
$ 96.70
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h
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Filters OIII CMOS f/2 Highspeed 31mm
Sale price:
$ 171.00
$ 107.56
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h
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Filters OIII CMOS f/2 Highspeed 50.4mm
Sale price:
$ 274.00
$ 172.75
ready for shipping in 24
h
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Filters OIII CMOS f/2 Highspeed 65x65mm
Sale price:
$ 393.00
$ 237.94
ready for shipping in 24
h