Moravian EFW-3 Filter Wheel

External Filter Wheel for C1×/C3 cameras.

The “S” filter wheels

The “S” filter wheels are compatible with C1+, C1×, C2, and C3 cameras:

• 12 positions for unmounted filters D31 mm or filters in 1.25” threaded cells.

• 10 positions for unmounted D36 mm filters.

• 7 positions for unmounted D50 mm or filters in 2” threaded cells..

• 5 positions for unmounted 50 × 50 mm filters.

EFW with “L” (large) adapter base

The “L”-sized adapter base is intended for greater adapters based on M68 × 1 thread, offering more robust connection between the camera and telescope. The Canon and Nikon lens bayonets are available also with the “L”-sized adapter base.

The “M” filter wheels

The “M” filter wheels correspond to the “S”-sized ones, only offer the “L” adapter base instead of the “S” adapter base. So, these filter wheels are compatible with the same camera series C1+, C1×, C2, and C3 and accommodate the same filters:

• 12 positions for unmounted filters D31 mm or filters in 1.25” threaded cells.

• 10 positions for unmounted D36 mm filters.

• 7 positions for unmounted D50 mm or filters in 2” threaded cells.

• 5 positions for unmounted 50 × 50 mm filters.

The “L” filter wheels

The “L” filter wheels are always equipped with the “L” adapter base. They accommodate these filters:

• 9 positions for unmounted D50 mm or filters in 2” threaded cells..

• 7 positions for unmounted 50 × 50 mm filters.

Both “M” and “L” sized EFW are made compatible with C2/C3 camera series as well as the C4 series, designed for greater sensors. However, while the C4 cameras also use four M3 threaded holes to attach EFW to camera head, these holes are 52 mm apart, compared to 44 mm of the C2/C3 series. Breaking the mechanical compatibility was necessary because of the size of sensors, used in C4 line.