In multi-band optical experiments, not every system requires twelve filters - many scenarios only need core filter elements such as long-wave pass, narrow-band, and attenuation filters, and a large wheel disc actually occupies valuable optical platform space. The Sefan Optoelectronics 7MMF3254S manual filter wheel, with a 6-step compact design, is specifically created for optical systems with limited space and moderate filter position requirements. With its exquisite structure and zero-offset switching, it becomes a flexible band-switching hub in small and medium-sized optical paths.
The 7MMF3254S adopts a plum blossom-shaped six-hole layout, capable of holding 6 Φ25mm/25.4mm filters or optical components simultaneously, compatible with 1-4mm thick lenses, and with a light transmittance aperture of 23mm. The 6-step capacity is sufficient for common spectral testing, fluorescence excitation, laser filtering, and optical modulation: long-wave pass filters remove multiple spectral levels, narrow-band filters select the target wavelength, neutral attenuation filters adjust the light intensity, and polarizing filters change the polarization direction - a single wheel disc covers the core filtering requirements, and there is no need to pay for unused filter positions.
The core mechanical advantage lies in maintaining a constant center of the optical path during rotation switching. Each time the wheel disc is rotated to select a filter, there is no need to recalibrate the light, completely eliminating the alignment errors brought by manual filter replacement. This design ensures the consistency of data after multiple switches, especially suitable for experiments that need to repeatedly compare different band signals, avoiding the need for repeated experiments and data rework due to optical path deviation.
The entire machine weighs only 0.255kg, lightweight and compact, with an outer diameter of approximately 100mm, saving more platform space than the 12-bit model. It features a detachable base design, allowing for free choice of two installation methods: either directly fixed on the optical platform surface or removing the base and suspending it with an M6 support rod for vertical setup, suitable for compact optical paths, vertical optical paths, and internal integration of equipment, etc. The wheel disc rotation damping is moderate, the position of the gears is clear, the operation feels smooth, and it is not prone to looseness after long-term use.
It is compatible with various optical components: in addition to band-pass, long-wave pass, and short-wave pass filters, neutral density attenuation filters, polarizing filters, beam-splitting filters, and other Φ25 standard optical components can be directly clamped. It can be used with Sefan monochromators, spectrometers, sample chambers, detectors, etc., quickly setting up transmission, reflection, fluorescence, and other types of test optical paths.
It is widely applicable: university physics and optoelectronics laboratories, for multi-band spectral screening and optical modulation; laser optical systems, for wavelength selection and power attenuation; machine vision and industrial inspection optical paths, for filtering out stray light and extracting target wavelengths; optical teaching experiments and development of small-scale detection prototypes.
Based on Sefan Optoelectronics' over 20 years of precise optical machine processing experience, the 7MMF3254S has stable processing accuracy and a durable structure, making it a cost-effective choice for domestic precision manual filter wheels. Six steps are neither too many nor too few, compact and not occupying space - 7MMF3254S ensures just the right band switching in optical experiments.
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