20mm Houdini Eyepiece Dust Cap
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Dust cap for use with folded down eye cup of 20mm Houdini coma correcting eyepiece.
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- Źródło
- Printables
- Kategoria
- Physics & Astronomy
- Licencja
- Creative Commons — Attribution — Noncommercial
The 20mm Houdini coma correcting eyepiece comes with a rubber dust cap that can only fit over the eye cup if the eye cup is folded up. However, it's most comfortable to use the eyepiece with the eye cup folded down, especially if wearing glasses. This means to put the included dust cap back on, you have to fold the eye cup back up each time. The eye cup is prone to slipping off the eyepiece when doing this, and the friction of capping the rubber eye cup with a rubber dust cap can make the process challenging. Moreover, the rubber cap & cup forms a seal, meaning any moisture/dew/condensation on or near the eye lens will essentially get sealed in, increasing risk of optical fungus growth.
This dust cap is designed to fit over the 20mm Houdini's eye cup when it is folded down, and makes use of internal ribs to prevent the dust cap from forming a seal with the eye cup. This promotes air flow, and will allow the eye lens to dry out when the eyepiece is stored with the cap on.
The 3D printed cap also has an ergonomic grip to make handling easier.