![](../images/photo_archives/2002/20021217/detent_arm_and_sensor.jpg) |
Detent arm and location sensor |
![](../images/photo_archives/2002/20021217/detent_sensors.jpg) |
Detent reed switch sensors |
![](../images/photo_archives/2002/20021217/encoders_overview.jpg) |
Filter wheel position encoders and magnet stacks |
![](../images/photo_archives/2002/20021217/filter_wheel_4bit_encoders_detail.jpg) |
Filte wheel 4-bit reed switch position encoders |
![](../images/photo_archives/2002/20021217/filter_wheel_4bit_encoders_parts.jpg) |
Circuit board, mounting block, reed switch, magnets for the filter wheel encoder system |
![](../images/photo_archives/2002/20021217/lyot_stop_and_pupil_cell.jpg) |
Pupil mask holder with mask and mask cover |
![](../images/photo_archives/2002/20021217/lyot_stop_assembled.jpg) |
Assembled pupil mask unit |
![](../images/photo_archives/2002/20021217/lyot_stop_assembled_zoom.jpg) |
Close-up of pupil mask in unit |
![](../images/photo_archives/2002/20021217/lyot_stop_inserted_into_bulkhead.jpg) |
Inserting pupil mask unit into second bulkhead within filter bay |
![](../images/photo_archives/2002/20021217/lyot_stops_from_photoetching.jpg) |
Pupil masks (version 1), after photoetching CuBe sheet and spray painting |
![](../images/photo_archives/2002/20021217/view_through_filter_box_optical_axis_through_pupil.jpg) |
View through filter box along optical axis to pupil mask |