Hoya and Schott Comparison Charts

These charts show the transmission curves for the Hoya RM90, RM100 and a range of Schott glasses used in certain makes of filter, such as the Heliopan.

The horizontal scale shows wavelengths and the vertical scale shows percent of transmission.

You can see here that both the RM90 and RM100 have a reasonably steep gain in transmission as the wavelength increases. In fact the curves are very similar for both filters, but shifted along the scale. The RM100 reaches around 75% transmission before the wavelength exceeds the longest that the CCD can see. The RM90 will reach around 82% at the same point. This gives the RM90 a slight advantage when used in artificial light, but puts the RM100 ahead when filming in sunlight.

 

This slightly more complicated graph shows a range of Schott filters. Although the wavelengths shown don't go high enough on this graph it appears that the filter would give around 85-90% transmission at the full extent of the CCD range. The transmission begins at roughly the same as the RM100. Although the curve looks very shallow compared to the RM100, the scale is different and the Schott RG1000 actually has a sharper increase.

It seems to me that the RG1000 has the slightly better performance in lower light than the RM100, but in sunlight they differ so slightly it is practically impossible to distinguish between them.

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