These are the Ultra High Speed version for IDAS NBZ filters, which is specially ideal for RASAs and HyperStars as well as camera lenses. Good thing is these are less expensive than the regular NBZ. So double benefits for the ultra high speed optics users. 48mm F1.8 to F4 and 52mm F1.8 to F2.8 are now in stock.

As shown above, they are most optimized for RASA 8.

~ by tedishikawa on July 6, 2021.

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