Hoya RM100 vs Schott RG830: IR Filter Comparison
By UQG Optics | Published: 2026-10-18
Category: Comparisons
Compare Hoya RM100 and Schott RG830 longpass filters for IR applications. Learn key differences in size, cost, and material to choose the right filter.
Quick Answer
Choose the Schott RG830 for budget-friendly, small-diameter IR filtering and the Hoya RM100 for larger square formats that require consistent transmission across a wider area.
Size and Form Factor Differences
The Schott RG830 is a 12.5 mm diameter round filter, while the Hoya RM100 is a 50 x 50 mm square. This size difference directly impacts where each filter fits. The RG830 suits compact systems like sensor modules or small lens assemblies. The RM100 works with larger optics, such as camera lenses or scientific instruments that need a square aperture.
If your setup has a round mount under 13 mm, the RG830 is a natural fit. For square or larger mounts, the RM100 offers more flexibility.
Cost and Value Trade-Off
The Schott RG830 is priced at USD 7.80 (down from USD 12.00), making it a low-cost entry point for IR longpass filtering. The Hoya RM100 costs USD 63.90 (down from USD 90.00) – significantly more, but you get nearly 16 times the filter area. For small projects or prototyping, the RG830 saves money. For production or permanent installations where you need consistent performance over a larger area, the RM100's price per square millimeter is competitive.
Material and Transmission Considerations
Both filters are longpass types, but they come from different glass families. The Schott RG830 is a Schott longpass filter, known for sharp cut-on characteristics. The Hoya RM100 is an infrared transmitting filter from Hoya, optimized for IR transmission. Neither manufacturer publishes detailed spectral curves in the supplied data, so you should verify transmission at your specific wavelength if you need precise cut-on steepness.
For general IR blocking and passing, both work. For critical applications like fluorescence imaging or IR spectroscopy, request spectral data from UQG Optics before ordering.
Trade-Offs at a Glance
- Size vs. Cost: The RG830 costs 88% less but covers only about 1.2 cm². The RM100 costs more but covers 25 cm². Choose RG830 for tiny spaces and RM100 for larger optics.
- Round vs. Square: RG830 is round (Ø 12.5 mm) and fits circular mounts. RM100 is square (50 x 50 mm) and fits square mounts or can be cut. Match your mount shape to avoid adapter costs.
- Spectral Certainty: Neither product listing provides full spectral data. Contact UQG Optics for transmission curves if your application demands a specific cut-on wavelength or slope steepness. Confirm spectral specs before ordering for critical IR work.
Product Facts
- Schott RG830: Schott RG830 is a 3 mm thick, Ø 12.5 mm round longpass filter, priced at USD 7.80 (catalog comparison price USD 12.00). Its small diameter and low cost make it ideal for compact, budget-sensitive IR filtering applications.
Schott RG830 - Hoya RM100: Hoya RM100 is a 3 mm thick, 50 x 50 mm square infrared transmitting filter, priced at USD 63.90 (catalog comparison price USD 90.00). The large square format suits systems that need consistent IR transmission across a wider aperture, such as camera lenses or lab instruments.
Hoya RM100
Which Filter Fits Your Project?
Best for
- Schott RG830: hobbyists, prototyping, or small-diameter sensor systems on a tight budget
- Hoya RM100: large-format IR imaging, lab setups, or square optical assemblies requiring consistent transmission across a 50 mm aperture
Not for
- Schott RG830: applications needing a large aperture or square format without adapters
- Hoya RM100: ultra-low-cost projects where a 12.5 mm round filter is sufficient
